Improved sealing composition and method for the preparation of a sealing composition
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10 claims: 10 independent, 0 dependent
- 1A sealant composition for the sealing of a punctured tyre including a liquid carrier selected from the group consisting of water, mixtures of water and propylene glycol, mixtures of water and ethylene glycol, mixtures of water, propylene glycol and ethylene glycol, and mixtures of propylene glycol and ethylene glycol, one or more viscosity and suspending agents selected from the group consisting of polysaccharide gum, carboxymethylcellulose, methylhydroxyethylcellulose, fumed silica and psyllium husk powder, one or more fillers and sealants selected from the group consisting of pulverised bark powder, pulverised peanut shells, pulverised fibrous material, pulverised cellulosic material, fine ground rubber crumb, fine ground low density polyethylene, ground plastics, selected from nylon, polypropylene, styrene and polyethyltetrahydrophthalate, powdered Equisetum arvense, tea powder, parsley powder, diatomite, bentonite, gum resin, sodium silicate and titanium dioxide, one or more polyacrylates, preferably a sodium polyacrylate, and optionally, further including one or more corrosion inhibiters selected from the group consisting of ammonium carbonate, sodium bicarbonate, and sodium borate. Composition colmatante destinée au colmatage d'un pneu perforé incluant un vecteur liquide sélectionné parmi le groupe constitué d'eau, de mélanges d'eau et de propylène glycol, de mélanges d'eau et d'éthylène glycol, de mélanges d'eau, de propylène glycol et d'éthylène glycol, et de mélanges de propylène glycol et d'éthylène glycol, un ou plusieurs agents de mise en suspension et de viscosité sélectionnés parmi le groupe constitué de gomme polysaccharide, de carboxyméthylcellulose, de méthylhydroxyéthylcellulose, de fumée de silice et de poudre de balles de psyllium, un ou plusieurs agents de remplissage et de colmatants sélectionnés parmi le groupe constitué de poudre d'écorces réduites en poudre, de coques d'arachides réduites en poudre, de matière fibreuse réduite en poudre, de matière cellulosique réduite en poudre, de granulés de caoutchouc finement broyés, de polyéthylène à faible densité finement broyé, de matières plastiques broyées, sélectionnées parmi le nylon, le polypropylène, le polystyrène et le polyéthyltétrahydrophtalate, d'Equisetum arvense réduit en poudre, de poudre de thé, de poudre de persil, de diatomite, de bentonite, de gomme-résine, de silicate de sodium et de dioxyde de titane, un ou plusieurs polyacrylates, de préférence un polyacrylate de sodium, et optionnellement, incluant en outre un ou plusieurs inhibiteurs de corrosion sélectionnés parmi le groupe constitué de carbonate d'ammonium, de bicarbonate de sodium, et de borate de sodium. Eine Dichtungszusammensetzung zum Abdichten eines ein Loch aufweisenden Reifens, mit einem flüssigen Träger, ausgewählt aus der Gruppe bestehend aus Wasser, Mischungen von Wasser und Propylenglycol, Mischungen von Wasser und Ethylenglycol, Mischungen von Wasser und Propylenglycol und Ethylenglycol, und Mischungen von Propylenglycol und Ethylenglycol,einem oder mehreren Viskositäts- und Suspensionsmitteln, ausgewählt aus der Gruppe bestehend aus Polysaccharid-Gummi, Carboxymethylcellulose, Methylhydroxyethylcellulose, pyrogenem Siliciumdioxid, Psyllium-Schalenpulver,einem oder mehreren Füllstoffen und Dichtmitteln, ausgewählt aus der Gruppe bestehend aus pulverisiertem Rindenpulver, pulverisierten Erdnusschalen, pulverisiertem Fasermaterial, pulverisiertem Cellulosematerial, fein gemahlenen Gummikrümeln, fein gemahlenem Polyethylen niedriger Dichte, gemahlenen Kunststoffen, ausgewählt aus Nylon, Polypropylen, Polystyrol, Polyethyltetrahydrophthalat, pulversiertem Equisetum Arvense, Teepulver, Petersilienpulver, Diatomit, Bentonit, Gummiharz, Natriumsilicat und Titandioxid,einem oder mehreren Polyacrylaten, vorzugsweise einem Natriumpolyacrylat, undoptional zudem beinhaltend ein oder mehrere Korrosionsschutzmittel, ausgewählt aus der Gruppe bestehend aus Ammoniumcarbonat, Natriumbicarbonat, und Natriumborat.
- 2A composition for sealing punctures in pneumatic tyres, said composition containing:(a) one or more of the group consisting of propylene glycol, comprising from 10 to 90 percent by weight of the composition, propylene-ethylene glycol blend, comprising from 10 to 90 percent by weight of the composition, and water, comprising from 10 to 90 percent by weight of the composition;(b) one or more viscosity and suspending agents selected from the group consisting of from 0.01 to 1.5 percent by weight of Xanthan gum, from 0.01 to 1.5 percent by weight of methylhydroxyethylcellulose, from 0.01 to 1.5 percent by weight of carboxymethylcellulose, from 0.05 to 3.0 percent by weight of fumed silica, and from 0.01 to 1.5 percent by weight of psyllium husk powder;(c) one or more fillers and sealing particulates selected from the group consisting of from 0.01 to 1.5 percent by weight of fine ground rubber crumb sieved to <60 microns, from 0.01 to 2.5 percent by weight of fine ground low density polyethylene sieved to <150 microns, from 0.01 to 2.5 percent by weight of ground plastics from the group composed of nylon, polypropylene, styrene and polyethyltetrahydrophthalate, from 0.5 to 5.0 percent by weight of diatomite of <60 microns diameter, from 0.01 to 1.5 percent by weight of bentonite, from 0.01 to 1.5 percent by weight of gum resin of <60 microns diameter;from 0.05 to 1.5 percent by weight of dissolved resin, from 0.1 to 2.0 percent by weight of sodium silicate;(d) one or more corrosion inhibitors selected from the group consisting of from 0.05 to 1.5 percent by weight of ammonium bicarbonate, from 0.05 to 1.5 percent by weight of sodium bicarbonate, and from 0.1 to 2.5 percent by weight of sodium borate;and(e) one or more polyacrylates, in an amount of from 0.05 to 2.0 percent by weight of components (a) to (d);and(f) a preservative making up the remainder of the composition. Composition destinée au colmatage de perforations dans des pneus, ladite composition contenant : (a) un ou plusieurs éléments du groupe constitué de propylène glycol, comprenant de 10 à 90 pour cent en poids de la composition, de mélange de propylène-éthylène glycol, comprenant de 10 à 90 pour cent en poids de la composition, et d'eau, comprenant de 10 à 90 pour cent en poids de la composition ;(b) un ou plusieurs agents de mise en suspension et de viscosité sélectionnés parmi le groupe constitué de 0,01 à 1,5 pour cent en poids de gomme xanthane, de 0,01 à 1,5 pour cent en poids de méthylhydroxyéthylcellulose, de 0,01 à 1,5 pour cent en poids de carboxyméthylcellulose, de 0,05 à 3,0 pour cent en poids de fumée de silice et de 0,01 à 1,5 pour cent en poids de poudre de balles de psyllium ;(c) un ou plusieurs agents de remplissage et de particules colmatantes sélectionnés parmi le groupe constitué de 0,01 à 1,5 pour cent en poids de granulés de caoutchouc finement broyés tamisés à < 60 microns, de 0,01 à 2,5 pour cent en poids de polyéthylène à faible densité finement broyé tamisé à < 150 microns, de 0,01 à 2,5 pour cent en poids de matières plastiques broyées, sélectionnées parmi le groupe composé du nylon, du polypropylène, du polystyrène et du polyéthyltétrahydrophtalate, de 0,5 à 5,0 pour cent en poids de diatomite de < 60 microns de diamètre, de 0,01 à 1,5 pour cent en poids de bentonite, de 0,01 à 1,5 pour cent en poids de gomme-résine de < 60 microns de diamètre, de 0,05 à 1,5 pour cent en poids de résine dissoute, de 0,1 à 2,0 pour cent en poids silicate de sodium ;(d) un ou plusieurs inhibiteurs de corrosion sélectionnés parmi le groupe constitué de 0,05 à 1,5 pour cent en poids de bicarbonate d'ammonium, de 0,05 à 1,5 pour cent en poids de bicarbonate de sodium, et de 0,1 à 2,5 pour cent en poids de borate de sodium ;et(e) un ou plusieurs polyacrylates, selon une proportion de 0,05 à 2,0 pour cent en poids de constituants (a) à (d) ;et(f) un conservateur constituant le reste de la composition. Eine Zusammensetzung zum Abdichten von Löchern in Luftreifen, wobei diese Zusammensetzung enthält: (a) ein oder mehrere aus der Gruppe aus Propylenglycol mit einem Anteil von 10 bis 90 Gewichtsprozent der Zusammensetzung, Propylen-Ethylen-Glycol-Mischung mit einem Anteil von 10 bis 90 Gewichtsprozent der Zusammensetzung und Wasser mit einem Anteil von 10 bis 90 Gewichtsprozent der Zusammensetzung;(b) einen oder mehrere Viskositäts- und Suspensionsmittel, ausgewählt aus der Gruppe aus 0,01 bis 1,5 Gewichtsprozent Xanthangummi, 0,01 bis 1,5 Gewichtsprozent Methylhydroxyethylcellulose, 0,01 bis 1,5 Gewichtsprozent Carboxymethyl- cellulose, 0,05 bis 3,0 Gewichtsprozent pyrogenes Siliciumdioxid und 0,01 bis 1,5 Gewichtsprozent Psyllium-Schalenpulver;(c) einen oder mehrere Füllstoffe und Abdichtpartikel, ausgewählt aus der Gruppe aus 0,01 bis 1,5 Gewichtsprozent fein gemahlenen Gummikrümeln, gesiebt auf <60 Mikrometer, 0,01 bis 2,5 Gewichtsprozent fein gemahlenes Polyethylen niedriger Dichte, gesiebt auf <150 Mikrometer, 0,01 bis 2,5 Gewichtsprozent gemahlene Kunststoffe, ausgewählt aus der Gruppe aus Nylon, Polypropylen, Polystyrol und Polyethyltetrahydrophthalat, 0,5 bis 5,0 Gewichtsprozent Diatomit mit einem Durchmesser von <60 Mikrometer, 0,01 bis 1,5 Gewichtsprozent Bentonit, 0,01 bis 1,5 Gewichtsprozent Gummiharz mit einem Durchmesser von <60 Mikrometer, 0,05 bis 1,5 Gewichtsprozent gelöstes Harz, 0,1 bis 2,0 Gewichtsprozent Natriumsilicat;(d) ein oder mehrere Korrosionsschutzmittel, ausgewählt aus der Gruppe aus 0,05 bis 1,5 Gewichtsprozent Ammoniumbicarbonat, 0,05 bis 1,5 Gewichtsprozent Natriumbicarbonat und 0,1 bis 2,5 Gewichtsprozent Natriumborat;und(e) ein oder mehrere Polyacrylate, in einer Menge von 0,05 bis 2,0 Gewichtsprozent in Bezug auf die Komponenten (a) bis (d) und(f) ein Konservierungsmittel, das den Rest der Zusammensetzung bildet.
- 3A composition for use in the sealing of a damaged inflatable article, said composition including water, from 20 to 80 percent by weight;a propylene glycol, from 20 to 80 percent by weight;a polysaccharide gum, from 0.1 to 0.3 percent by weight;a cellulose polymer, as for example carboxymethylcellulose, from 0.01 to 0.3 percent by weight;fumed colloidal silica, from 0.1 to 0.5 percent by weight;ammonium bicarbonate, from 0.1 to 1 percent by weight;borax, from 0.1 to 2 percent by weight;Diatomite (less than 60 micron), from 1.0 to 5.0 percent by weight;low density polyethylene powder (less than 100 micron) from 0.01 to 0.5 percent by weight;Bentonite less than 40 micron from 0.1 to 1.0 percent by weight;gum resin less than 30 micron from 0.05 to 0.5 percent by weight;one or more polyacrylates, in an amount of from 0.05 to 1.0 percent;and a preservative from 0.1 to 0.5 percent by weight. Composition destinée à être utilisée dans le colmatage d'un article gonflable endommagé, ladite composition incluant de l'eau, de 20 à 80 pour cent en poids ;un propylène glycol, de 20 à 80 pour cent en poids ;une gomme polysaccharide, de 0,1 à 0,3 pour cent en poids ;un polymère de cellulose, comme par exemple de la carboxyméthylcellulose, de 0,01 à 0,3 pour cent en poids ;de la fumée de silice colloïdale, de 0,1 à 0,5 pour cent en poids ;du bicarbonate d'ammonium, de 0,1 à 1 pour cent en poids ;du borax, de 0,1 à 2 pour cent en poids ;de la diatomite (de moins de 60 microns), de 1,0 à 5,0 pour cent en poids ;de la poudre de polyéthylène de faible densité (de moins de 100 microns) de 0,01 à 0,5 pour cent en poids ;de la bentonite de moins de 40 microns, de 0,1 à 1,0 pour cent en poids ;de la gomme-résine de moins de 30 microns, de 0,05 à 0,5 pour cent en poids ;un ou plusieurs polyacrylates, selon une proportion de 0,05 à 1,0 pour cent en poids ;et un conservateur, de 0,1 à 0,5 pour cent en poids. Eine Zusammensetzung zur Verwendung beim Abdichten eines beschädigten aufblasbaren Gegenstands, enthaltend von 20 bis 80 Gewichtsprozent Wasser;von 20 bis 80 Gewichtsprozent eines Propylenglycols;von 0,1 bis 0,3 Gewichtsprozent eines Polysaccharid-Gummis;von 0,01 bis 0,3 Gewichtsprozent eines Cellulose-Polymers, wie beispielsweise Carboxymethylcellulose;von 0,1 bis 0,5 Gewichtsprozent pyrogenes kolloidales Silicumdioxid;von 0,1 bis 1 Gewichtsprozent Ammoniumhydrogencarbonat;von 0,1 bis 2 Gewichtsprozent Borax;von 1,0 bis 5,0 Gewichtsprozent Diatomit (kleiner als 60 Mikrometer);von 0,01 bis 0,5 Gewichtsprozent pulverisiertes Polyethylen niedriger Dichte (kleiner als 100 Mikrometer);von 0,1 bis 1,0 Gewichtsprozent Bentonit, kleiner als 40 Mikrometer;von 0,05 bis 0,5 Gewichtsprozent Gummiharz, kleiner als 30 Mikrometer;einem oder mehreren Polyacrylaten, in einer Menge von 0,05 bis 1,0 Prozent;und von 0,1 bis 0,5 Gewichtsprozent eines Konservierungsmittels.
- 4A composition for use in sealing a punctured vehicle tyre, said composition containing the following constituents, with all amounts in percentage by weight:a hot melt pre-mix consisting making up 10.5 percent of the final composition, and consisting of the following constituents, with all amounts in percentage by weight of the pre-mix a hydrophobic tackifying resin12.5rice bran4.0magnesium carbonate2.0propylene glycol81.5;a gum resin pre-mix, making up 12.5 percent of the final composition, and consisting of the following components, with all amounts and percentage by weight of the pre-mix gum resin12.5rice bran4.0magnesium carbonate2.0propylene glycol81.5;a casein pre-mix, making up 4.25 percent of the final composition and consisting of the following components, with all amounts in percentage by weight of the pre-mix: casein15.0rice bran1.0magnesium carbonate0.5ethylene glycol83.5glycerine3.0skim milk powder0.75;a resin soluble solution pre-mix, making up 9 percent of the final composition, and consisting of the following components, with all amounts in percentage by weight of the pre-mix ethylene glycol18.0propylene glycol50.0water15.8ammonia 20 percent3.5ethyl alcohol3.5formalin0.2gum resin9.0magnesium carbonate0.5;a dilution solution pre-mix, making up 57.25 percent of the final composition, and consisting of the following components, with all amounts in percentage by weight of the pre-mix, propylene glycol2.1glycerine1.0ethylene glycol36.0water60.0ammonia0.3formalin0.3opacifier0.15fluorescein0.02glycerine3.0skim milk powder0.75magnesium carbonate.05water2.5, andone or more polyacrylates, in an amount of from 0.05 to 2.0 percent. Composition destinée à être utilisée dans le colmatage d'un pneu de véhicule perforé, ladite composition contenant les constituants suivants, dont les proportions sont toutes indiquées en pourcentage en poids : un prémélange thermofusible représentant 10,5 pour cent de la composition finale, et composé des constituants suivants, dont les proportions sont toutes indiquées en pourcentage en poids du prémélange : une résine donnant du collant hydrophobe12,5issues de riz4,0carbonate de magnésium2,0propylène glycol81,5 ;un prémélange de gomme-résine, représentant 12,5 pour cent de la composition finale, et composé des constituants suivants, dont les proportions sont toutes indiquées en pourcentage en poids du prémélange gomme-résine12,5issues de riz4,0carbonate de magnésium2,0propylène glycol81,5 ;un prémélange de caséine, représentant 4,25 pour cent de la composition finale et composé des constituants suivants, dont les proportions sont toutes indiquées en pourcentage en poids du prémélange : caséine15,0issues de riz1,0carbonate de magnésium0,5éthylène glycol83,5glycérine3,0poudre de lait écrémé0,75 ;un prémélange de solution soluble de résine, représentant 9 pour cent de la composition finale, et composé des constituants suivants, dont les proportions sont toutes indiquées en pourcentage en poids du prémélange : éthylène glycol18,0propylène glycol50,0eau15,8ammoniaque à 20 pour cent3,5alcool éthylique3,5formaline0,2gomme-résine9,0carbonate de magnésium0,5 ;un prémélange de solution de dilution, représentant 57,25 pour cent de la composition finale, et composé des constituants suivants, dont les proportions sont toutes indiquées en pourcentage en poids du prémélange : propylène glycol2,1glycérine1,0éthylène glycol36,0eau60,0ammoniaque0,3formaline0,3opacifiant0,15fluorescéine0,02glycérine3,0poudre de lait écrémé0,75carbonate de magnésium0,05eau2,5, etun ou plusieurs polyacrylates, selon une proportion de 0,05 à 2,0 pour cent. Eine Zusammensetzung zur Verwendung beim Abdichten eines ein Loch aufweisenden Fahrzeugreifens, wobei die Zusammensetzung die folgenden Bestandteile enthält, die in Gewichtsprozent angegeben sind: Eine Hotmelt-Vormischung, die 10,5 Prozent der finalen Zusammensetzung ausmacht und aus den folgenden Bestandteilen besteht, die in Gewichtsprozent in Bezug auf die Vormischung angegeben sind ein hydrophobes klebrigmachendes Harz12,5Reiskleie4,0Magnesiumcarbonat2,0Propylenglycol81,5;eine Gummiharz-Vormischung, die 12,5 Prozent der finalen Zusammensetzung ausmacht und aus den folgenden Komponenten besteht, die in Gewichtsprozent in Bezug auf die Vormischung angegeben sind Gummiharz12,5Reiskleie4,0Magnesiumcarbonat2,0Propylenglycol81,5;eine Casein-Vormischung, die 4,25 Prozent der finalen Zusammensetzung ausmacht und aus den folgenden Komponenten besteht, die in Gewichtsprozent in Bezug auf die Vormischung angegeben sind: Casein15,0Reiskleie1,0Magnesiumcarbonat0,5Ethylenglycol83,5Glycerol3,0Magermilchpulver0,75;eine Lösliches-Harz-Lösungs-Vormischung, die 9 Prozent der finalen Zusammensetzung ausmacht und aus den folgenden Komponenten besteht, die in Gewichtsprozent in Bezug auf die Vormischung angegeben sind Ethylenglycol18,0Propylenglycol50,0Wasser15,8Ammoniak, 20-prozentig3,5Ethylalkohol3,5Formalin0,2Gummiharz9,0Magnesiumcarbonat0,5;eine Verdünnungslösungs-Vormischung, die 57,25 Prozent der finalen Zusammensetzung ausmacht und aus den folgenden Komponenten besteht, die in Gewichtsprozent in Bezug auf die Vormischung angegeben sind, Propylenglycol2,1Glycerin1,0Ethylenglycol36,0Wasser60,0Ammoniak0,3Formalin0,3Trübungsmittel0,15Fluorescein0,02Glycerin3,0Magermilchpulver0,75Magnesiumcarbonat,05Wasser2,5 undein oder mehrere Polyacrylate, in einer Menge von 0,05 bis 2,0 Prozent.
- 5A method for the preparation of a composition as claimed in Claim 4, wherein the hot melt resin pre-mix, gum resin pre-mix and casein pre-mix as disclosed in Claim 4 are separately blended and reduced in temperature to -20°C and separately milled to approximately 150 - 200 micron particle size;a resin soluble solution pre-mix as disclosed in Claim 4 is prepared by adding gum resin to half of the propylene glycol and heated to 80°C until fully melted, the remainder of the propylene glycol being mixed with the remaining ingredients of the pre-mix, followed by the slow addition of the hot phase of the resin glycol mixture with stirring;all components of the final composition are then added together, cooled to -30°C and passed through a colloid mill to form a colloidal suspension with a particle size not exceeding 180 micron. Procédé de préparation d'une composition selon la revendication 4, dans laquelle le prémélange de résine thermofusible, le prémélange de gomme-résine et le prémélange de caséine selon la revendication 4 sont préparés séparément et refroidis à une température de - 20 °C et broyés séparément de sorte à atteindre une taille de particules d'environ 150-200 microns ;un prémélange de solution de résine soluble selon la revendication 4 est préparé en ajoutant de la gomme-résine à la moitié de la quantité de propylène glycol et en chauffant ce mélange à 80 °C jusqu'à ce que la gomme-résine soit complètement fondue, en mélangeant le reste du propylène glycol aux ingrédients restants du prémélange, puis en ajoutant lentement à ce mélange la phase chaude du mélange résine-glycol sous agitation ;tous les constituants de la composition finale sont ensuite ajoutés ensemble, refroidis à - 30 °C et passés dans un broyeur colloïdal pour former une suspension colloïdale ayant une taille de particules ne dépassant pas 180 microns. Verfahren zur Herstellung einer Zusammensetzung gemäß Anspruch 4, wobei die in Anspruch 4 offenbarte Hotmelt-Harz-Vormischung, Gummiharz-Vormischung und Casein-Vormischung getrennt voneinander gemischt werden und auf eine Temperatur von -20 °C gekühlt werden und getrennt voneinander auf eine Partikelgröße von etwa 150 - 200 Mikrometer gemahlen werden;eine in Anspruch 4 beschriebene Lösliches-Harz-Lösungs-Vormischung durch Hinzufügen von Gummi-Harz zur Hälfte des Propylenglycols und Erhitzen auf 80 °C, bis es vollständig geschmolzen ist, hergestellt wird, und das übrige Propylenglycol mit den verbleibenden Bestandteilen der Vormischung gemischt wird, gefolgt von einer langsamen Zugabe der heißen Phase zu der Harz-Glycol- Mischung unter Rühren;alle Bestandteile der finalen Zusammensetzung werden dann zusammengefügt, auf -30 °C gekühlt und durch eine Kolloidmühle geleitet, sodass sich eine kolloidale Suspension mit einer Partikelgröße nicht über 180 Mikrometer ergibt.
- 6A sealant composition, prepared in two parts, hereinafter referred to as a pre-mix gum rosin solution (A) and particulate suspension (B) respectively, wherein said pre-mix gum rosin solution (A) includes the following with the amounts being given in percentages by weight :(1)ethylene glycol18;(2)propylene glycol24;(3)water15.8(4)ammonia 20%4.0(5)alcohol4.0(6)formalin0.2(7)propylene glycol24.0and(8)gum rosin10.0and wherein the particulate suspension (B) includes:(9)sodium polyacrylate0.75(10)water41.0(11)propylene glycol5.9(12)ethylene glycol42.0(13)ammonia (20%)0.2(14)formalin0.15 with the balance, of the order of 10% by weight, being made up of pre-mix gum rosin solution (A). Composition colmatante, préparée en deux parties, ci-après appelées respectivement solution de colophane de prémélange (A) et suspension particulaire (B), où ladite solution de colophane de prémélange (A) inclut les éléments suivants dont les proportions sont indiquées en pourcentage en poids : (1) éthylène glycol18 ;(2) propylène glycol24 ;(3) eau15,8(4) ammoniaque à 20 %4,0(5) alcool4,0(6) formaline0,2(7) propylène glycol24,0et(8) colophane10,0et où la suspension particulaire (B) inclut :(9) polyacrylate de sodium0,75(10) eau41,0(11) propylène glycol5,9(12) éthylène glycol42,0(13) ammoniaque (à 20 %)0,2(14) formaline0,15 le reste, de l'ordre de 10 % en poids, étant constitué de la solution de colophane de prémélange (A). Eine Dichtungszusammensetzung, hergestellt in zwei Teilen, im Weiteren als eine Vormischungs-Balsamharz-Lösung (A) und eine Partikelsuspension (B) bezeichnet, wobei die Vormischungs-Balsamharz-Lösung (A) das Folgende enthält und die Mengen in Gewichtsprozent angegeben sind: (1)Ethylenglycol18;(2)Propylenglycol24;(3)Wasser15,8(4)Ammoniak 20%4,0(5)Alkohol4,0(6)Formalin0,2(7)Propylenglycol24,0und(8)Balsamharz10,0und wobei die Partikelsuspension (B) beinhaltet:(9)Natriumpolyacrylat0,75(10)Wasser41,0(11)Propylenglycol5,9(12)Ethylenglycol42,0(13)Ammoniak (20%)0,2(14)Formalin0,15 in dem Verhältnis, dass die Vormischungs-Balsamharz-Lösung (A) in der Größenordnung von 10 Gewichtsprozent ausmacht.
- 7A method for the production of the composition as claimed in claim 6, wherein ingredients (1) to (6) of said pre-mix gum rosin solution (A) are first combined, in descending order, with stirring, wherein said gum rosin (8) is added into the remaining propylene glycol and that mix is heated to around 80°C, until the gum rosin is fully melted, and wherein the hot mix of gum rosin and propylene glycol is then added to the mixture of ingredients (1) to (6), with stirring, and wherein said pre-mix gum rosin solution (A) is then added to ingredients (9) to (14) of said particulate suspension (B). Ein Verfahren zur Herstellung der Zusammensetzung gemäß Anspruch 6, wobei die Bestandteile (1) bis (6) der Vormischungs-Balsamharz-Lösung (A) zuerst in absteigender Reihenfolge unter Rühren vereint werden, wobei das Balsamharz (8) dem verbleibenden Propylenglycol zugegeben wird und die Mischung auf etwa 80 °C erhitzt wird, bis das Balsamharz vollständig geschmolzen ist, und wobei die heiße Mischung aus Balsamharz und Propylenglycol dann zu der Mischung der Bestandteile (1) bis (6) unter Rühren hinzugefügt wird, und wobei die Vormischungs-Balsamharz-Lösung (A) dann zu den Bestandteilen (9) bis (14) der Partikel-Suspension (B) hinzugefügt wird. Procédé de préparation de la composition selon la revendication 6, dans laquelle les ingrédients (1) à (6) de ladite solution de colophane de prémélange (A) sont tout d'abord combinés, dans l'ordre décroissant, sous agitation, où ledit colophane (8) est ajouté dans le propylène glycol restant et ce mélange est chauffé à environ 80 °C, jusqu'à ce que le colophane soit complètement fondu, et où le mélange chaud de colophane et de propylène glycol est ensuite ajouté au mélange constitué des ingrédients (1) à (6), sous agitation, et où ladite solution de colophane de prémélange (A) est ensuite ajoutée aux ingrédients (9) à (14) de ladite suspension particulaire (B).
- 8A process for preparing a composition for sealing punctures in pneumatic tyres, said process including the steps of A. forming a hot phase pre-mix by adding rosin, comprising between 0.5 and 5.0% by weight of the final composition, and propylene glycol, comprising between 0.5 and 5.0% by weight of the final composition, to a steam jacketed vessel and heating to a temperature of about 100°C until the rosin is fully melted in the propylene glycol, followed by cooling with stirring until a temperature of about 50°C is reached, then adding ethyl alcohol, comprising between 0.3 and 5.0% by weight of the final composition, 20% ammonia, comprising between 0.15 and 1.5% by weight of the final composition), water, comprising between 0.0 and 5.0% by weight of the final composition, polyethylene powder , comprising between 0.15 and 5.0% by weight of the final composition, diatomite, comprising between 0.15 and 3.0% by weight of the final composition and, optionally zinc stearate, comprising between 0.1 and 1.0% by weight of the final composition, while continuing stirring;B. forming a gel phase pre-mix in a separate vessel by adding, with stirring, sodium polyacrylate, comprising between 0.2 and 1.5% by weight of the final composition, to water, comprising between 10 and 20% by weight of the final composition, at a temperature of about 25°C, continuing stirring for up to 15 minutes, then adding with stirring propylene glycol, comprising between 0.0 and 10% by weight of the final composition, 20% ammonia, comprising between 0.01 and 0.3% by weight of the final composition and a portion of hot phase pre-mix formed by step A, comprising between 0.2 and 5.0% by weight of the final composition;C. in another separate vessel adding, and mixing with stirring, water, comprising between 20 and 80% by weight of the final composition, propylene glycol, comprising between 10 and 50% by weight of the final composition, ethylene glycol, comprising between 0 and 30% by weight of the final composition, 20% ammonia, comprising between 0.2 and 1.5% by weight of the final composition, the remainder of the hot phase pre-mix, the total hot phase pre-mix ultimately comprising between 3.0 and 20.0% by weight of the final composition, the gel phase pre-mix, after passing through a grinder to reduce the particle size to between 50µm and 2000µm, comprising between 5.0 and 20% by weight of the final composition and, optionally, an opacifier and/or PVA/MA, comprising between 0.1 and 10.0% by weight of the final composition; then continually stirring the resultant composition for up to 24 hours with ambient temperature being reached. Ein Verfahren zum Herstellen einer Zusammensetzung zum Abdichten von Löchern in Luftreifen, mit den Schritten:A. Herstellen einer Heißphasen-Vormischung durch Hinzufügen von Kolophonium mit einem Anteil zwischen 0,5 und 5,0 Gewichts-% der finalen Zusammensetzung und Propylenglycol mit einem Anteil zwischen 0,5 und 5,0 Gewichts-% der finalen Zusammensetzung in einen Behälter mit einem Dampfmantel und Erhitzen auf eine Temperatur von etwa 100 °C, bis das Kolophonium vollständig in dem Propylenglycol geschmolzen ist, gefolgt von Kühlen unter Rühren, bis eine Temperatur von etwa 50 °C erreicht ist, dann Hinzufügen von Ethylalkohol mit einem Anteil zwischen 0,3 bis 5,0 Gewichts-% der finalen Zusammensetzung, 20%igem Ammoniak mit einem Anteil zwischen 0,15 und 1,5 Gewichts-% der finalen Zusammensetzung), Wasser mit einem Anteil zwischen 0,0 und 5,0 Gewichts-% der finalen Zusammensetzung, Polyethylen-Pulver mit einem Anteil zwischen 0,15 und 5,0 Gewichts-% der finalen Zusammensetzung, Diatomit mit einem Anteil zwischen 0,15 und 3,0 Gewichts-% der finalen Zusammensetzung, optional Zinkstearat mit einem Anteil zwischen 0,1 und 1,0 Gewichts-% der finalen Zusammensetzung, weiterhin unter Rühren;B. Herstellen einer Gelphasen-Vormischung in einem separaten Behälter durch Hinzufügen, unter Rühren, von Natriumpolyacrylat mit einem Anteil zwischen 0,2 und 1,5 Gewichts-% der finalen Zusammensetzung zu Wasser mit einem Anteil zwischen 10 und 20 Gewichts-% der finalen Zusammensetzung, bei einer Temperatur von etwa 25 °C, Fortsetzen des Rührens für bis zu 15 Minuten, dann, unter Rühren, Hinzufügen von Propylenglycol mit einem Anteil zwischen 0,0 und 10 Gewichts-% der finalen Zusammensetzung, 20%igem Ammoniak mit einem Anteil zwischen 0,01 und 0,3 Gewichts-% der finalen Zusammensetzung und einem Teil der Heißphasen-Vormischung aus Schritt A mit einem Anteil zwischen 0,2 und 5,0 Gewichts-% der finalen Zusammensetzung;C. In einem weiteren separaten Behälter unter Mischen und Rühren, Hinzufügen von Wasser mit einem Anteil zwischen 20 und 80 Gewichts-% der finalen Zusammensetzung, Propylenglycol mit einem Anteil zwischen 10 und 50 Gewichts-% der finalen Zusammensetzung, Ethylenglycol mit einem Anteil zwischen 0 und 30 Gewichts-% der finalen Zusammensetzung, 20%igem Ammoniak mit einem Anteil zwischen 0,2 und 1,5 Gewichts-% der finalen Zusammensetzung des Rests der Heißphasen-Vormischung, wobei die vollständige Heißphasen-Vormischung letztendlich 3,0 bis 20,0 Gewichtsprozent der finalen Zusammensetzung ausmacht, der Gelphasen-Vormischung, nachdem diese durch ein Mahlwerk geleitet wurde, um die Partikelgröße auf 50 µm bis 2000 µm zu reduzieren, mit einem Anteil zwischen 5,0 und 20,0 Gewichts-% der finalen Zusammensetzung, und optional einem Trübungsmittel und/oder PVA/MA mit einem Anteil zwischen 0,1 und 10,0 Gewichts-% der finalen Zusammensetzung;anschließend kontinuierliches Rühren der resultierenden Zusammensetzung für bis zu 24 Stunden, wobei Raumtemperatur erreicht wird. Procédé de préparation d'une composition destinée au colmatage de perforations dans des pneus, ladite méthode incluant les étapes consistant à A. former un prémélange de phase chaude en ajoutant du colophane, comprenant entre 0,5 et 5,0 % en poids de la composition finale, et du propylène glycol, comprenant entre 0,5 et 5,0 % en poids de la composition finale, dans un récipient à enveloppe de vapeur et en chauffant à une température d'environ 100 °C jusqu'à ce que le colophane soit complètement fondu dans le propylène glycol, puis en refroidissant sous agitation jusqu'à atteindre une température d'environ 50 °C, puis en ajoutant de l'alcool éthylique, comprenant entre 0,3 et 5,0 % en poids de la composition finale, de l'ammoniaque à 20 %, comprenant entre 0,15 et 1,5 % en poids de la composition finale, de l'eau, comprenant entre 0,0 et 5,0 % en poids de la composition finale, de la poudre de polyéthylène, comprenant entre 0,15 et 5,0 % en poids de la composition finale, de la diatomite, comprenant entre 0,15 et 3,0 % en poids de la composition finale et, optionnellement du stéarate de zinc, comprenant entre 0,1 et 1,0 % en poids de la composition finale, tout en maintenant l'agitation ;B. former un prémélange de phase gel dans un autre récipient en ajoutant, sous agitation, du polyacrylate de sodium, comprenant entre 0,2 et 1,5 % en poids de la composition finale, à de l'eau, comprenant entre 10 et 20 % en poids de la composition finale, à une température d'environ 25 °C, en maintenant l'agitation pendant 15 min, puis en ajoutant sous agitation du propylène glycol, comprenant entre 0,0 et 10 % en poids de la composition finale, de l'ammoniaque à 20 %, comprenant entre 0,01 et 0,3 % en poids de la composition finale et une partie du prémélange de phase chaude formé à l'étape A, comprenant entre 0,2 et 5,0 % en poids de la composition finale ;C. dans un autre récipient, ajouter et mélanger sous agitation de l'eau, comprenant entre 20 et 80 % en poids de la composition finale, du propylène glycol, comprenant entre 10 et 50 % en poids de la composition finale, de l'éthylène glycol, comprenant entre 0 et 30 % en poids de la composition finale, de l'ammoniaque à 20 %, comprenant entre 0,2 et 1,5 % en poids de la composition finale, le reste du prémélange de phase chaude, le prémélange de phase chaude total comprenant au final entre 3,0 et 20,0 % en poids de la composition finale, le prémélange de phase gel, après l'avoir passé dans un broyeur pour réduire la taille de particules à une valeur comprise entre 50 µm et 2 000 µm, comprenant entre 5,0 et 20 % en poids de la composition finale et, optionnellement, un opacifiant et/ou du PVA/MA, comprenant entre 0,1 et 10,0 % en poids de la composition finale ;puis agiter continuellement la composition résultante pendant un maximum de 24 heures pour atteindre la température ambiante.
- 9A process for preparing a composition for sealing punctures in pneumatic tyres, said process including the steps of A. forming a hot phase pre-mix by adding rosin, comprising 1.5% by weight of the final composition and propylene glycol, comprising 1.5% by weight of the final composition, to a steam jacketed vessel and heating to a temperature of about 100°C until the rosin is fully melted in the propylene glycol, followed by cooling with stirring until a temperature of about 50°C is reached, then adding ethyl alcohol, comprising 1.0% by weight of the final composition, 20% ammonia, comprising 0.4% by weight of the final composition, water, comprising 0.7% by weight of the final composition, polyethylene powder, from 10µm to 180µm in size, comprising 1.0% by weight of the final composition, diatomite, comprising 0.8% by weight of the final composition, and zinc stearate, comprising 0.2% by weight of the final composition while continuing stirring;B. forming a gel phase pre-mix in a separate vessel by adding, with stirring, sodium polyacrylate,comprising 0.2% by weight of the final composition to water, comprising 11.43% by weight of the final composition at a temperature of about 25°C, continuing stirring for up to 15 minutes, then adding with stirring propylene glycol, comprising 3.5% by weight of the final composition), 20% ammonia (comprising 0.07% by weight of the final composition and a portion of hot phase pre-mix formed by step A, comprising 0.8% by weight of the final composition;C. in another separate vessel adding, and mixing with stirring, water, comprising 33.2% by weight of the final composition, propylene glycol, comprising 33% by weight of the final composition, ethylene glycol, comprising 10% by weight of the final composition, 20% ammonia, comprising 0.35% by weight of the final composition, the remainder of the hot phase pre-mix, the total hot phase pre-mix ultimately comprising 7.1% by weight of the final composition, the gel phase pre-mix, from 10µm to 180µm in size after passing through a grinder to reduce the particle size to between 50µm and 2000µm, comprising 16% by weight of the final composition and, optionally, formalin, comprising 0.15% by weight of the final composition and, optionally, opacifier and/or PVA/MA; then continually stirring the resultant composition for up to 24 hours with ambient temperature being reached. Ein Verfahren zum Herstellen einer Zusammensetzung zum Abdichten von Löchern in Luftreifen, mit den Schritten:A. Herstellen einer Heißphasen-Vormischung durch Hinzufügen von Kolophonium mit einem Anteil von 1,5 Gewichts-% der finalen Zusammensetzung und Propylenglycol mit einem Anteil von 1,5 Gewichts-% der finalen Zusammensetzung in einen Behälter mit einem Dampfmantel und Erhitzen auf eine Temperatur von etwa 100 °C bis das Kolophonium vollständig in dem Propylenglycol geschmolzen ist, gefolgt von Kühlen unter Rühren bis eine Temperatur von etwa 50 °C erreicht ist, dann Hinzufügen von Ethylalkohol, mit einem Anteil von 1,0 Gewichts-% der finalen Zusammensetzung, 20%igem Ammoniak, mit einem Anteil von 0,4 Gewichts-% der finalen Zusammensetzung), Wasser, mit einem Anteil von 0,7 Gewichts-% der finalen Zusammensetzung, Polyethylen-Pulver mit einer Größe von 10 µm bis 180 µm mit einem Anteil von 1,0 Gewichts-% der finalen Zusammensetzung, Diatomit mit einem Anteil von 0,8 Gewichts-% der finalen Zusammensetzung, und Zinkstearat mit einem Anteil von 0,2 Gewichts-% der finalen Zusammensetzung, weiterhin unter Rühren;B. Herstellen einer Gelphasen-Vormischung in einem separaten Behälter durch Hinzufügen, unter Rühren, von Natriumpolyacrylat, mit einem Anteil von 0,2 Gewichts-% der finalen Zusammensetzung, zu Wasser, mit einem Anteil von 11,43 Gewichts-% der finalen Zusammensetzung, bei einer Temperatur von etwa 25 °C, Fortsetzen des Rührens für bis zu 15 Minuten, dann, unter Rühren, Hinzufügen von Propylenglycol, mit einem Anteil von 3,5 Gewichts-% der finalen Zusammensetzung), 20%igem Ammoniak, (mit einem Anteil von 0,07 Gewichts-% der finalen Zusammensetzung und einem Teil der Heißphasen-Vormischung aus Schritt A mit einem Anteil von 0,8 Gewichts-% der finalen Zusammensetzung;C. In einen weiteren separaten Behälter und Mischen unter Rühren, Hinzufügen von Wasser mit einem Anteil von 33,2 Gewichts-% der finalen Zusammensetzung, Propylenglycol mit einem Anteil von 33 Gewichts-% der finalen Zusammensetzung, Ethylenglycol mit einem Anteil von 10 Gewichts-% der finalen Zusammensetzung, 20%igem Ammoniak mit einem Anteil von 0,35 Gewichts-% der finalen Zusammensetzung, der restlichen Heißphasen-Vormischung, wobei die vollständige Heißphasen-Vormischung letztendlich 7,1 Gewichtsprozent der finalen Zusammensetzung ausmacht, der Gelphasen-Vormischung, mit einer Größe von 50 µm bis 180 µm, nachdem diese durch ein Mahlwerk geleitet wurde, um die Partikelgröße auf 50 µm bis 2000 µm zu reduzieren, mit einem Anteil von 16 Gewichts-% der finalen Zusammensetzung, und optional Formalin mit einem Anteil von 0,15 Gewichts-% der finalen Zusammensetzung, und optional Trübungsmittel und/oder PVA/MA, anschließend kontinuierliches Rühren der resultierenden Zusammensetzung für bis zu 24 Stunden, wobei Raumtemperatur erreicht wird. Procédé de préparation d'une composition destinée au colmatage de perforations dans des pneus, ladite méthode incluant les étapes consistant à A. former un prémélange de phase chaude en ajoutant du colophane, comprenant 1,5 % en poids de la composition finale, et du propylène glycol, comprenant 1,5 % en poids de la composition finale, dans un récipient à enveloppe de vapeur et en chauffant à une température d'environ 100 °C jusqu'à ce que le colophane soit complètement fondu dans le propylène glycol, puis en refroidissant sous agitation jusqu'à atteindre une température d'environ 50 °C, puis en ajoutant de l'alcool éthylique, comprenant 1,0 % en poids de la composition finale, de l'ammoniaque à 20 %, comprenant 0,4 % en poids de la composition finale, de l'eau, comprenant 0,7 % en poids de la composition finale, de la poudre de polyéthylène, de taille comprise entre 10 µm et 180 µm, comprenant 1,0 % en poids de la composition finale, de la diatomite, comprenant 0,8 % en poids de la composition finale, et du stéarate de zinc, comprenant 0,2 % en poids de la composition finale, tout en maintenant l'agitation ;B. former un prémélange de phase gel dans un autre récipient en ajoutant, sous agitation, du polyacrylate de sodium, comprenant 0,2 % en poids de la composition finale, à de l'eau, comprenant 11,43 % en poids de la composition finale, à une température d'environ 25 °C, en maintenant l'agitation pendant 15 min, puis en ajoutant sous agitation du propylène glycol, comprenant 3,5 % en poids de la composition finale, de l'ammoniaque à 20 %, comprenant 0,07 % en poids de la composition finale et une partie du prémélange de phase chaude formé à l'étape A, comprenant 0,8 % en poids de la composition finale ;C. dans un autre récipient, ajouter et mélanger sous agitation de l'eau, comprenant 33,2 % en poids de la composition finale, du propylène glycol, comprenant 33 % en poids de la composition finale, de l'éthylène glycol, comprenant 10 % en poids de la composition finale, de l'ammoniaque à 20 %, comprenant 0,35 % en poids de la composition finale, le reste du prémélange de phase chaude, le prémélange de phase chaude total comprenant au final 7,1 % en poids de la composition finale, le prémélange de phase gel, de taille comprise entre 10 µm et 180 µm après l'avoir passé dans un broyeur pour réduire la taille de particules à une valeur comprise entre 50 µm et 2 000 µm, comprenant 16 % en poids de la composition finale et, optionnellement, de la formaline, comprenant 0,15 % en poids de la composition finale et, optionnellement, un opacifiant et/ou du PVA/MA ;puis agiter continuellement la composition résultante pendant un maximum de 24 heures pour atteindre la température ambiante.
- 10A composition for sealing punctures in pneumatic tyres prepared by the process as claimed in any one of claims 8 or 9. Composition destinée au colmatage de pneus préparée par la mise en oeuvre du procédé selon la revendication 8 ou 9. Eine Zusammensetzung zum Abdichten von Löchern in Luftreifen hergestellt nach dem Verfahren nach einem der Ansprüche 8 oder 9.
Independent claims10
73 paragraphs in 11 sections, as filed
FIELD OF THE INVENTION
The present invention relates, in general terms, to improved compositions for use in the sealing - as by repair - of a damaged inflatable article. More particularly, but not exclusively, the invention relates to improved compositions for use in the sealing - as by repair - of a damaged - as for example punctured - tyre for a vehicle. The invention also relates to a method for the preparation of such compositions.
BACKGROUND OF THE INVENTION
The invention relates to an improvement in or modification of the sealant composition the subject of the present applicant's International (PCT) Application No. <patcit id="pcit0001" dnum="AU2007001222W"><text>PCT/AU2007/001222</text></patcit>.
A puncture can be a serious hazard associated with the use of inflatable load-carrying articles such as tyres - whether such be on automobiles, trucks, motorcycles, bicycles, etc. When a puncture occurs with an automobile, for example, the traditional practice has been to replace the damaged/punctured tyre with the spare, with such spare being intended to allow for use of the vehicle either only for a limited time and limited distance - to allow the driver to travel to a site where the damaged tyre can be repaired and restored to the vehicle - or in the alternative to allow the vehicle to be driven without problems until such time as a replacement or repaired tyre can be secured and installed.
There can be difficulties associated with, firstly, removal of a punctured tyre and, secondly, location of the spare or a replacement tyre on the vehicle. These difficulties can include the unavailability of the tooling needed to remove a damaged tyre and replace such with the spare, and the actual physical effort associated with such tasks, not to mention potential risks/damage to the person effecting such a task. Furthermore, the situation has been known to arise where the spare tyre may not be sufficiently inflated to be properly and safely usable.
In accord with the prior art practices there have been employed, for purposes of introduction of a sealing composition into a punctured tyre, an apparatus consisting of a pressurised container for the sealing composition which houses a liquefied gas - of any suitable type - as a pressure source. Such container includes, for purposes of dispensing the contents thereof, a valve or the like having associated or to be associated therewith an adaptor which allows for connection of the overall container to the tyre valve. Such an adaptor may be of the screw-on type, or of any other known type. With such an arrangement the sealing composition is sprayed into the tyre through the tyre valve, the tyre then being re-inflated by means of the propellant gas, which then allows the car to be driven.
In another known arrangement a sealing composition is housed within a compressible flask which is to be connected, via an adaptor of any known type, to the tyre valve, with the valve insert or core having first been removed therefrom. With such an arrangement the sealing composition is sprayed into the tyre by applying pressure to the compressible flask. After the valve core or insert has been replaced, the tyre can then be re-inflated as desired (using any suitable means and method). This method and arrangement suffers in that, to be carried out, it is necessary to physically remove the valve core or insert from the tyre valve itself.
In accordance with the known art there have also been used in the past sealant compositions, intended to be injected into a damaged tyre, useful for emergency (and almost invariably) temporary, repair of a puncture wound in the tread portion of such tyre. Such compositions have traditionally included latex (or the equivalent) as a principal constituent thereof. The compositions are intended to be injected into the tyre via the tyre valve (with or without valve core in place).
However the use of latex (or an equivalent) in itself has given rise to problems, due to the "sticky" nature thereof. Firstly, the use of latex will leave a sticky, messy residue in the tyre valve itself, which will more often than not need to be removed/cleaned away before that valve is re-useable. Secondly, the dispensation of a latex-based composition from a container therefor will mean that such container may not be suitable for re-use, again by reason of the fact that any nozzle or the like dispensing means associated therewith, and/or any tubing or hosing for passage of the sealing composition from container to tyre, will be gummed-up, perhaps even being blocked or sealed, by residual or undispersed composition.
Further, and when a latex-based composition is employed the situation is that, when air is still escaping from the tyre, via the puncture, and the latex composition is oozing (under pressure) through the hole in the tyre, the air causes the latex to cross-link and bond with the rubber of the tyre. The end result is that, whilst the puncture may be sealed, the actual puncture site becomes extremely difficult, if not actually impossible, to locate. This inability to identify a repaired puncture site gives rise to its own problems. In accordance with regulations, and indeed using common sense, if one knows of the existence of a puncture in a tyre, and even if that puncture has been temporarily repaired - using such a latex-based composition - it is still necessary to have the tyre properly, and permanently, repaired. If the site cannot be located, a permanent repair cannot be effected. The alternative, then, is to physically replace the tyre when punctured - an expensive exercise indeed.
There are environmental issues concerning latex and the use of latex-based compositions for purposes of temporary tyre repair which may be summarised as follows: <ol id="ol0001" compact="compact" ol-style=""><li>(1) the life or age limit of latex is usually 5 years;</li><li>(2) unless the puncturing object remains in the tyre it is virtually impossible to locate, inspect and repair the tyre permanently - to meet with safety regulations and standards the tyre must then be discarded;</li><li>(3) latex must not be allowed to enter sewerage/surface water or ground water;</li><li>(4) any used packaging contaminated with cured latex cannot be cleaned for recycling and therefore must be disposed of along with the substance;</li><li>(5) with latex, cleaning and washing the tyre is problematic; the tyre can only be cleaned by absorbing the liquid with cloth/rags and placing them in containers for waste disposal;</li><li>(6) latex emulsion gives off a strong ammonia vapour and is therefore not popular in tyre repair shops and the like, due to this noxious odour;</li><li>(7) latex emulsion has a pH value of 10 and, if contact occurs, can cause irritation to eyes, skin or mucous membranes;</li><li>(8) latex spills will permanently stain clothing or work garments unless the excess latex is immediately removed and the garments thoroughly washed before cross-linking occurs, which usually is not feasible;</li><li>(9) latex sealants ideally should be filled into bottles under a bed of nitrogen to minimise the cross-linking effects of oxygen on latex; any oxidation is detrimental to the sealing capacity of latex and also increases the possibility of granulated particles lodging in tyre valve; even occasional small droplets of latex carried by compressed air (or the like) in hoses can start "skinning" in the hose and can also end up agglomerating in the valve area; and</li><li>(10) latex contains volatile organic compositions which can be harmful to health if swallowed, cause acid burns, can cause sensitisation through skin contact and are highly toxic for aquatic organisms.</li></ol>
Apart from the problems associated with the prior art as outlined earlier, these days it is a trend in vehicle design that vehicles are being manufactured and marketed without being supplied with a spare wheel. This means that a practical, workable repair kit needs to be provided, such a kit being intended to be simple to operate, preferably re-usable and not requiring clean-up of excess sticky sealing compounds (as for example latex or the like).
The present invention seeks to overcome the problems and difficulties associated with the prior art practices by providing a composition and apparatus which allows for ready in situ repair - as by re-sealing - of a punctured tyre, thereby eliminating the need for replacement thereof (at least temporarily).
With the composition and apparatus of this present invention it is not necessary to remove the valve core or insert from the tyre valve. More importantly the composition of the present invention, by not including latex (or the equivalent), avoids the need for clean-up and disposal of residual unwanted material (latex) upon completion of any repair.
It will be understood, by those persons familiar with the art, that punctures which are capable of being effectively sealed with these types of compositions are those which occur in the substantial majority of cases to vehicle wheels in the course of normal usage, as for example, punctures to car and truck tyres by nails, screws, pieces of wire and the like.
It has been found that the addition of polyacrylates and other similar synthetic elastomers, and more particularly sodium polyacrylate, to known sealant compositions, will give rise to an overall composition which will exhibit significantly enhanced flow properties (when compared for example with those of the present applicant's aforementioned International Application).
<patcit id="pcit0002" dnum="US4588758A"><text>US 4 588 758 A</text></patcit> describes a sealant composition for the sealing of a punctured tyre including inter alia ethylene glycol, sodium polyacrylate as a thickener and binding agent, and sodium bicarbonate.
SUMMARY OF THE INVENTION
It is an aim of the present invention to provide an improved composition for the in situ sealing of a punctured tyre, which composition is introducible into the tyre via the tyre valve thereof without there being any need to first remove the valve core or insert and without resulting in any blockage of the tyre valve itself and any associated tubing, with the entire composition being capable of passing through the restricted passage existing within the valve.
The present invention provides a sealant composition for the sealing of a punctured tyre according to claim 1 or 2.
The invention also provides a composition for use in the sealing of a damaged inflatable article according to claim 3 and a composition for use in sealing a punctured vehicle tyre according to claim 4.
The invention also provides a method for the preparation of the composition just mentioned, according to claim 5.
The invention also provides a sealant composition according to claim 6 and a method for the production of the composition, according to claim 7.
The invention also provides a process for preparing a composition for sealing punctures in pneumatic tyres, according to claim 8 or 9, and a composition for sealing punctures in pneumatic tyres, according to claim 10.
DESCRIPTION OF THE INVENTION
Compositions according to the invention achieve their effectiveness - as compared with the latex-based prior art compositions - by virtue of them being based on/in the form of a colloidal dispersion blended with other fine particles which is capable of passing through the restrictive passage afforded by a valve core of a tyre valve without resulting in blockage thereof, yet at the same time retains sufficient sealing properties to be capable of repairing punctures. It is also important that there only be minimal separation of ingredients within the tyre chamber when the liquid is subjected to centrifugal force at 80kph.
Due to the restricted passage available through a valve core the liquid must be formulated in such a way that the sealing particles retained therein pass freely through the valve unhindered and therefore do not agglomerate anywhere, so as to avoid the possibility of blockage occurring.
The liquid carrier may be water, in an amount from 10 to 90 percent by weight. Alternatively, a mixture of water and propylene glycol and/or ethylene glycol, again in an amount of from 10 to 90 percent by weight, may be employed. In yet a further alternative the liquid carrier may be a mixture of propylene glycol and ethylene glycol, again in an amount of from 10 to 90 percent by weight. The principal requirement of the liquid carrier is that it is substantially inert in terms of its reacting with the other constituents of the overall composition. In an especially preferred embodiment the liquid carrier will be a mixture of up to 30 percent by weight water and up to 30 percent by weight of propylene glycol and/or ethylene glycol.
Insofar as the viscosity and suspension agents are concerned, any one (or more) of the following may be employed: <tables id="tabl0001" num="0001"><table frame="none"><tgroup cols="2" colsep="0" rowsep="0"><colspec colnum="1" colname="col1" colwidth="36mm" /><colspec colnum="2" colname="col2" colwidth="13mm" /><tbody><row><entry>magnesium carbonate</entry><entry align="center">2.0</entry></row><row><entry>ethylene glycol</entry><entry align="center">81.5;</entry></row></tbody></tgroup></table></tables> a casein pre-mix, making up 4.25 percent of the final composition and consisting of the following components (with all amounts in percentage by weight of the pre-mix): <tables id="tabl0002" num="0002"><table frame="none"><tgroup cols="2" colsep="0" rowsep="0"><colspec colnum="1" colname="col1" colwidth="36mm" /><colspec colnum="2" colname="col2" colwidth="13mm" /><tbody><row><entry>casein</entry><entry align="center">15.0</entry></row><row><entry>rice bran</entry><entry align="center">1.0</entry></row><row><entry>magnesium carbonate</entry><entry align="center">0.5</entry></row><row><entry>ethylene glycol</entry><entry align="center">83.5</entry></row><row><entry>glycerine</entry><entry align="center">3.0</entry></row><row><entry>skim milk powder</entry><entry align="center">0.75;</entry></row></tbody></tgroup></table></tables> a resin soluble solution pre-mix, making up 9 percent of the final composition, and consisting of the following components (with all amounts in percentage by weight of the pre-mix) <tables id="tabl0003" num="0003"><table frame="none"><tgroup cols="2" colsep="0" rowsep="0"><colspec colnum="1" colname="col1" colwidth="37mm" /><colspec colnum="2" colname="col2" colwidth="12mm" /><tbody><row><entry>ethylene glycol</entry><entry align="center">18.0</entry></row><row><entry>propylene glycol</entry><entry align="center">50.0</entry></row><row><entry>water</entry><entry align="center">15.8</entry></row><row><entry>ammonia (20 percent)</entry><entry align="center">3.5</entry></row><row><entry>ethylalcohol</entry><entry align="center">3.5</entry></row><row><entry>formalin</entry><entry align="center">0.2</entry></row><row><entry>gum resin</entry><entry align="center">9.0</entry></row><row><entry>magnesium carbonate</entry><entry align="center">0.5;</entry></row></tbody></tgroup></table></tables> a dilution solution pre-mix, making up 57.25 percent of the final composition, and consisting of the following components (with all amounts in percentage by weight of the pre-mix) <tables id="tabl0004" num="0004"><table frame="none"><tgroup cols="2" colsep="0" rowsep="0"><colspec colnum="1" colname="col1" colwidth="36mm" /><colspec colnum="2" colname="col2" colwidth="17mm" /><tbody><row><entry>propylene glycol</entry><entry align="char" char=".">2.1</entry></row><row><entry>glycerine</entry><entry align="char" char=".">1.0</entry></row><row><entry>ethylene glycol</entry><entry align="char" char=".">36.0</entry></row><row><entry>water</entry><entry align="char" char=".">60.0</entry></row><row><entry>ammonia</entry><entry align="char" char=".">0.3</entry></row><row><entry>formalin</entry><entry align="char" char=".">0.3</entry></row><row><entry>opacifier (PVA)</entry><entry align="char" char=".">0.15</entry></row><row><entry>fluorescein</entry><entry align="center">0.02</entry></row><row><entry>glycerine</entry><entry align="center">3.0</entry></row><row><entry>skim milk powder</entry><entry align="center">0.75</entry></row><row><entry>magnesium carbonate</entry><entry align="center">.05</entry></row><row><entry>water</entry><entry align="center">2.5, and</entry></row></tbody></tgroup></table></tables> one or more polyacrylates, in an amount of from 0.05 to 2.0 percent. The one or more polyacrylates may be sodium polyacrylates.
According to another aspect of the present invention there is provided a method for the preparation of a composition as disclosed above, wherein the hot melt resin pre-mix, gum resin pre-mix and casein pre-mix as disclosed above are separately blended and reduced in temperature to -20°C and separately milled to approximately 150 - 200 micron particle size; a resin soluble solution pre-mix as disclosed above is prepared by adding gum resin to half of the propylene glycol and heating to 80°C until fully melted, the remainder of the propylene glycol being mixed with the remaining ingredients of the pre-mix, followed by the slow addition of the hot phase of the resin glycol mixture with stirring; all components of the final composition are then added together, cooled to -30°C and passed through a colloid mill to form a colloidal suspension with particle size not exceeding 130 micron.
According to another aspect of the present invention there is provided a process for preparing a composition for sealing punctures in pneumatic tyres, said process including the steps of: <ol id="ol0002" compact="compact" ol-style=""><li>A. forming a hot phase premix by adding rosin (comprising between 0.5 and 5.0% by weight of the final composition) and propylene glycol (comprising between 0.5 and 5.0% by weight of the final composition) to a steam jacketed vessel and heating to a temperature of about 100°C until the rosin is fully melted in the propylene glycol, followed by cooling with stirring until a temperature of about 50°C is reached, then adding ethyl alcohol (comprising between 0.3 and 5.0% by weight of the final composition), 20% ammonia (comprising between 0.15 and 1.5% by weight of the final composition), water (comprising between 0.0 and 5.0% by weight of the final composition), polyethylene powder (from 10µm to 180µm in size) (comprising between 0.15 and 5.0% by weight of the final composition), diatomite (comprising between 0.15 and 3.0% by weight of the final composition) while continuing stirring;</li><li>B. forming a gel phase premix in a separate vessel by adding, with stirring, sodium polyacrylate (comprising between 0.2 and 1.5% by weight of the final composition) to water (comprising between 10 and 20% by weight of the final composition) at a temperature of about 25°C, continuing stirring for up to 15 minutes, then adding with stirring propylene glycol (comprising between 0.0 and 10% by weight of the final composition), 20% ammonia (comp[rising between (0.01 and 0.3% by weight of the final composition) and a portion of hot phase premix formed by step A (comprising between 0.2 and 5.0% by weight of the final composition);</li><li>C. in another separate vessel adding, and mixing with stirring, water (comprising between 20 and 80% by weight of the final composition), propylene glycol (comprising between 10 and 50% by weight of the final composition), ethylene glycol (comprising between 0 and 30% by weight of the final composition0, 20% ammonia (comprising between 0.2 and 1.5% by weight of the final composition), the remainder of the hot phase premix (the total hot phase premix ultimately comprising between 3.0 and 20.0% by weight of the final composition), the gel phase premix (after passing through a grinder to reduce the particle size to between 50µm and 2000µm) (comprising between 5.0 and 20% by weight of the final composition); then continually stirring the resultant composition for up to 24 hours with ambient temperature being reached.</li></ol>
According to another aspect of the present invention there are provided compositions for sealing punctures in pneumatic tyres prepared by one of the above-described processes.
According to another aspect of the present invention there is also provided a composition for use in sealing a punctured vehicle tyre, said composition containing the following constituents (with all amounts in percentage by weight): a dilution solution pre-mix consisting of the following components (with all amounts in percentage by weight of the pre-mix) <tables id="tabl0005" num="0005"><table frame="none"><tgroup cols="2" colsep="0" rowsep="0"><colspec colnum="1" colname="col1" colwidth="30mm" /><colspec colnum="2" colname="col2" colwidth="12mm" /><tbody><row><entry>Propylene Glycol</entry><entry>2.1</entry></row><row><entry>Glycerine</entry><entry align="right">1.0</entry></row><row><entry>Ethylene Glycol</entry><entry align="right">36.0</entry></row><row><entry>Water</entry><entry align="right">60.0</entry></row><row><entry>Ammonia</entry><entry align="right">.3</entry></row><row><entry>Formalin</entry><entry align="right">.3</entry></row><row><entry>Opacifier (PVA)</entry><entry align="right">.15</entry></row><row><entry>Fluorescein</entry><entry align="right">.02</entry></row></tbody></tgroup></table></tables> to which has been added a polyacrylate at an amount of between 0.05 percent and 2.0 percent by weight of the pre-mix, followed by high shear mixing to mill the polyacrylate particles down to less than 150 microns.
DESCRIPTION OF THE INVENTION
Compositions in accordance with the invention achieve their effectiveness - as compared with the latex-based prior art compositions - by virtue of them being based on/in the form of a colloidal dispersion blended with other fine particles which is capable of passing through the restrictive passage afforded by a valve core of a tyre valve without resulting in blockage thereof, yet at the same time retains sufficient sealing properties to be capable of repairing punctures. It is important also that there be only minimal separation of ingredients within the tyre chamber when the liquid is subjected to centrifugal force at 80kph.
Due to the restricted passage available through a valve core the liquid must be formulated in such a way that the sealing particles retained therein pass freely through the valve unhindered and therefore do not agglomerate anywhere, so as to avoid the possibility of blockage occurring.
The liquid carrier may be water, in an amount of from 10 to 90 percent by weight. Alternatively, a mixture of water and propylene glycol and/or ethylene glycol, again in an amount of from 10 to 90 percent by weight, may be employed. In yet a further alternative the liquid carrier may be a mixture of propylene glycol and ethylene glycol, again in an amount of from 10 to 90 percent by weight. The principal requirement of the liquid carrier is that it is substantially inert in terms of its reacting with the other constituents of the overall composition. In an especially preferred embodiment the liquid carrier will be a mixture of up to 30 percent by weight water and up to 30 percent by weight of propylene glycol and/or ethylene glycol.
Insofar as the viscosity and suspension agents are concerned, any one (or more) of the following may be employed: <ol id="ol0003" compact="compact" ol-style=""><li>(a) a polysaccharide gum, as for example Xanthan gum, in an amount of from 0.05 to 1.0 percent by weight, more preferably about 0.25 percent by weight;</li><li>(b) carboxymethylcellulose and/or methylhydroxyethylcellulose, in an amount of from 0.01 to 1.0, more preferably about 0.05, percent by weight; and/or</li><li>(c) fumed silica (more especially that available under the name/trade mark AEROSIL R972), in an amount of from 0.01 to 1.0, more preferably about 0.05, percent by weight.</li></ol>
A preferred suspension medium is a combination of 0.15 to 0.2 percent Xanthan gum and 0.05 to 0.075 percent methyl hydroxyethylcellulose. To allow for prolonged storage in motor vehicles (for as long as 8 years) all solid particles in the formulation must remain substantially in suspension during a test when subjected to 80 degrees Celsius temperature for a period of 12 hours and can easily be redispersed after shaking.
The fillers or particulates in the composition, whose function is to seal the puncture, may include any one or more of the following: <ol id="ol0004" compact="compact" ol-style=""><li>(a) pulverised bark powder and/or pulverised peanut shells, or the like fibrous or cellulosic material, of a particle size less than 150 micron and in an amount of from 0.01 to 1.0, more preferably about 0.075, percent by weight;</li><li>(b) powdered Equisetum Arvense (commonly known as "horsetail"), of a particle size less than 150 micron and in an amount of from 0.01 to 1.0, more preferably about 0.06, percent by weight;</li><li>(c) tea powder, of a particle size less than 150 micron and in an amount of from 0.01 to 1.0, more preferably about 0.05, percent by weight;</li><li>(d) parsley powder, of a particle size less than 150 micron and in an amount of from 0.01 to 1.0, more preferably about 0.05, percent by weight;</li><li>(e) diatomite, of a particle size less than 30 micron and in an amount of from 0.05 to 5.0, more preferably about 1.5, percent by weight;</li><li>(f) Bentonite, of a particle size less than 40 micron and in an amount of from 0.15 to 5.0, more preferably about 0.75, percent by weight;</li><li>(g) gum rosin, of a particle size less than 30 micron and in an amount of from 0.05 to 1.5, more preferably about 0.2, percent by weight; and/or</li><li>(h) titanium dioxide, in an amount of from 0.01 to 1.0, more preferably about 0.10, percent by weight.</li></ol>
Any suitable corrosion inhibitors may be employed. Preferably such may be a combination of one or more of the following: <ol id="ol0005" compact="compact" ol-style=""><li>(a) ammonium carbonate, in an amount of from 0.01 to 1.0, more preferably about 0.06, percent by weight;</li><li>(b) sodium bicarbonate, in an amount of from 0.1 to 1.0, more preferably about 0.06, percent by weight; and/or</li><li>(c) sodium borate, in an amount of from 0.02 to 2.0 more preferably about 0.12, percent by weight.</li></ol>
Experience/experimentation has revealed that, internally of a tyre, corrosive elements/components can exist and/or be formed. By way of example only, traces (minor amounts) of sulphuric acid can be found to leak from a tyre. Furthermore, corrosive elements/components can be created/formed within the tyre chamber itself, as for example traces of ozone generated by static electricity (between for example the tyre bead and the associated wheel/rim).
Such corrosive elements can, with time, have a deleterious effect on any exposed metal of the wheel/rim. For that reason, in an especially preferred embodiment the composition in accordance with the present invention will have included therein one or more corrosive inhibitors. Such will preferably be from the group including ammonium bicarbonate, sodium bicarbonate and/or sodium borate. Ammonium bicarbonate and/or sodium bicarbonate may be included in an amount of from 0.01 to 1.0 percent, most preferably 0.06 percent, by weight. Sodium borate may be included in an amount of from 0.02 to 2.0 percent, most preferably 0.12 percent by weight.
It has been found that the addition of synthetic elastomers such as polyacrylates substantially reduces settling and improved suspension of fine particles and further improves the sealing performance of the sealing compositions. The preferred rate of addition of polyacrylate, or similar synthetic elastomers, is between 0.05 percent and 2.0 percent by weight of the overall composition. The percentage of the addition depends upon the type of polymer. Higher percentages of polyacrylate will have been found to increase the viscosity and seriously limit the easy flow of the sealant within the tyre chamber.
It has also been found that polyacrylate will work as a sealant in its own right when added to ethylene glycol/propylene glycol/water solutions. A preferred sealing composition according to this aspect contains propylene glycol, glycerine, ethylene glycol, water, ammonia, formalin, an opacifier, and fluorescein to which is added polyacrylate, or any other synthetic elastomer, at a ratio of between 0.05 percent to 2.0 percent by weight, followed by milling down to less than 150 micron. This composition works effectively as a sealant and is capable of passing through the valve core. The polyacrylate is added to the other components and passed through a high shear mixer. The result is a fine dispersion of the synthetic polymer throughout the composition which doubles as a suspending agent and as a sealing agent. While this particular range of compositions show satisfactory sealing properties, the longevity of the compositions is uncertain.
As can be seen from above the sealing composition in accordance with the present invention is in the form of a stable aqueous suspension of one or more solid particulate materials, wherein the particulate material preferably is a minor amount of the overall composition. The carrier fluid, such as water, or water in combination with propylene glycol and/or ethylene glycol and the minor amounts of one or more solid particulate materials (which are substantially insoluble in the liquid components of the composition) are inert to the rubber composition of the tyre into which it is intended to be placed.
The particulate material making up the "solid" component of the composition may include materials such as vermiculite, diatomaceous earth and other infusorial earths, various forms of mica and other finely divided solids.
A sealant or sealant composition in accordance with the present invention, being an improvement on latex-based compositions presently in use, constitutes a means for repair (at least temporarily) of a puncture in a pneumatic tyre, the composition being readily capable of being introduced into the damaged tyre by means of compressed air or gas propellant.
The arrangement is such as to allow a particle-based sealant composition - as distinct from the prior art latex-based compositions - to be injected into the damaged tyre via the tyre valve, with the valve core or insert in place.
Ecological benefits of non-latex sealant compositions include: <ol id="ol0006" compact="compact" ol-style=""><li>(1) the expiry date of packaged product is increased substantially;</li><li>(2) after the tyre is cleaned it is possible to locate the puncture site for inspection and repair and prevent the tyre from being discarded;</li><li>(3) particle-based sealant can be allowed to enter the sewer system;</li><li>(4) packaging can be easily cleaned for re use and/or recycling;</li><li>(5) cleaning rags can be washed and re-used repeatedly with no requirement for them to enter the waste stream;</li><li>(6) a non latex sealant does not have a noxious odour;</li><li>(7) the pH of the product is almost neutral and, apart from the ethylene glycol content, is not considered an irritant;</li><li>(8) any spills or splashes on clothing or equipment will wipe or wash off readily; and</li><li>(9) due to the controlled size of particles in the carrier fluid the valve is left with only minimal contamination after treating the tyre.</li></ol>
In accordance with car industry desiderata, for a sealant composition to be approved for use in vehicles (or with vehicles) it must satisfy certain requirements and meet certain parameters. By way of example a sealant composition is required to be effective within a temperature range of from - 40°C to +80°C. With such a requirement, problems in terms of performance have been identified with the compositions as defined and exemplified, for example, in the present applicant's International Patent Application No. <patcit id="pcit0003" dnum="AU2007001222W"><text>PCT/AU2007/001222</text></patcit>. By way of example only substances such as xanthan gum, rice bran etc. as referred to in the said International Application have been found to restrict the flow of liquid in the tyre chamber, and are not therefore as effective in terms of their ability to seal punctures. Whilst such substances have been found to function satisfactorily at temperatures down to - 30°C, at lower temperatures their viscosity has been found to increase to an extent wherein they may not flow as smoothly through the reduced space of a valve core of a tyre valve or the like, giving rise to an increase likelihood of blockage of such a valve.
To achieve an optimum result and satisfy the aforementioned desiderata, and also preferably to ensure a simplified formula for the overall composition, it is desirable to utilise a composition which still flows freely at temperatures as low as -40°C. In that regard, in order to achieve sealing in the high deflection area of a tyre's "footprint", a degree of flexibility needs to be inherent in the particles intended to make up a seal in or at the site of a puncture. This, in accordance with the present invention, may be achieved by the inclusion of elastic/elastomeric material, such as fine ground rubber, low density polyethylene, sodium polyacrylate and the like.
Fillers and particles from the components such as elastomers, which exhibit a degree of flexibility, can be substituted for the substantially non-flexible sealing particles as referred to in the said International Patent Application No. <patcit id="pcit0004" dnum="AU2007001222W"><text>PCT/AU2007/001222</text></patcit>.
Sodium polyacrylate granules when dispersed in water quickly soften and swell. Depending upon particle size finely ground polyacrylates can also exhibit pseudo mucilaginous gel like properties. This phenomenon enables softened sodium polyacrylate particles, preferably in the range between 10µm and 300µm, to reliably squeeze through the restricted passage of a tyre valve core. The physical properties of sodium polyacrylate facilitate the transport of the largest possible particle size (up to 200µm) of solid particles by escorting the particles through the highly restricted passageway of a tyre valve core.
The elastomeric jelly like structure of swollen saturated sodium polyacrylate also allows solid particles such as polyethylene powder (not exceeding 180µm), pulverised bark, tea, Equisetum, etc., to physically embed into the softened sodium polyacrylate. The very large particles of sodium polyacrylate (up to 300µm) have a dual function - as well as guiding the solid particles, they act as a sweeper that helps to continually clear away any particles that may become trapped in the tyre valve core mechanism. The partial encapsulation-like process affords a controlled and even distribution of the solid particles in the composition and is an effective technique to limit the risk of blockage in the tyre valve core. When the sealant composition is pressurized and driven by 6-8 bar air/gas pressure through a tyre valve core the resulting high velocity of the sealant composition passing through the tyre valve core (equating to about 20ml per second) overcomes the tendency for solid particles to agglomerate and block the core. If the flow rate through the tyre valve core drops to about 2-3 ml per second the valve core will instantly or very rapidly block. Without the combination of high velocity and partial impregnation of solid particles in the sodium polyacrylate or partial surrounding of the solid particles by the sodium polyacrylate, blockage of the tyre valve core would occur instantly or very rapidly.
The physical process of sealing a puncture in a tyre with a particle-based valve-through sealant composition is dependant upon the flow rate. As a result of the comparatively low velocity of air escaping through the confines of a puncture site in a tyre at around 2 bar air pressure (this equates to between about 0.1ml and 3ml per second), the reduced speed of the solid particles agglomerate and effectively block and seal the puncture instantly or very rapidly, whereas during installation of the sealant composition through a tyre valve core the high velocity of the particles counteracts the blocking effect.
Sealing punctures in the crown area of a tyre is relatively simple as a constant supply is maintained at the puncture site while the vehicle is being driven. When the puncture is located outside this region and in the extreme shoulder area the opportunity for the sealant composition to flood the puncture site while the vehicle speed is above 3 kmh is minimal. If the puncturing object is wider that 5mm and up to 6.25 mm in diameter and if the puncture site is in the shoulder area there is a likelihood that the tyre will lose air pressure. The challenge, as with all tyre sealants, is to ensure durability of the seal in the shoulder area over extended periods of non-stop driving. Normally the recommended maximum driving speed is limited to 90 kmh. This is enable the driver to safely control the vehicle in the event of a sudden loss of pressure in a temporarily repaired tyre. If a vehicle is driven continually while air pressure in a tyre is being lost due to a puncture in the shoulder area caused by a 6.25mm diameter puncturing object, air loss will cease once the tyre has lost about half its recommended tyre air pressure. As a tyre loses air pressure the footprint area of the tyre increases and sidewall distance to the footprint area decreases. This causes a change in the dynamics of the flow pattern of the liquid sealant composition inside the tyre. As the footprint area increases so does width of sealant composition coverage in that area. Due to radial variation the liquid sealant compostion fish tails in the flat footprint area thereby forcing the sealant composition to reach an extreme sidewall intrusion once every revolution of the tyre.
DESCRIPTION OF PREFERRED EMBODIMENTS
In order that the invention may be more clearly understood and put into practical effect there shall now be described in detail preferred embodiments of sealing compositions in accordance with the invention.
EXAMPLE 1
A sealant composition in accordance with the present invention includes a suitable elastomer, more especially sodium polyacrylate, in suspension. The sodium polyacrylate, in particulate form, when in such a suspension will pass through the tyre valve without blockage.
The composition is prepared in two parts, hereinafter referred to as a pre-mix gum rosin solution (A) and particulate solution (B) respectively, and then combined as explained hereinafter.
The pre-mix gum rosin solution (A) includes the following (with the amounts being given in percentages by weight): <ol id="ol0007" compact="compact" ol-style=""><li>(1) ethylene glycol - 18;</li><li>(2) propylene glycol - 24;</li><li>(3) water - 15.8;</li><li>(4) ammonia 20% - 4.0;</li><li>(5) alcohol - 4.0;</li><li>(6) formalin - 0.2;</li><li>(7) propylene glycol - 24.0 and</li><li>(8) gum rosin - 10.0.</li></ol>
This solution (A) is formed as explained hereinafter.
Ingredients (1) to (6) are first combined, in descending order preferably, with stirring. Separately the gum rosin (7) is added into the remaining propylene glycol and that mix is heated, to around 80°C, until the gum rosin is fully melted. That hot mix of gum rosin and propylene glycol is then added to the mixture of ingredients (1) to (6), while stirring.
As to the particulate solution, preferably such is made up from the following: <ul id="ul0001" list-style="none" compact="compact"><li>(9) sodium polyacrylate - 0.75;</li><li>(10) water - 41.0;</li><li>(11) propylene glycol - 5.9;</li><li>(12) ethylene glycol - 42.0;</li><li>(13) ammonia (20%) - 0.2;</li><li>(14) formalin - 0.15;</li></ul> with the balance, of the order of 10% by weight, being made up of gum rosin solution (A).
The gum rosin solution, where added to particulate solution (B), has been found to prevent the sodium polyacrylate from gelling. The particulate solution (B) is subjected to high shear mixing or grinding and it is important that gelling does not occur during such a process.
In practice solution (B) is subjected to high shear mixing with a homogenizer and/or passed through a liquid grinder to a first shape particle size reduction of the sodium polyacrylate. Such treatment is contained until the suspension becomes smooth. The suspension is then preferably cooled to a temperature of the order of -20°C and the product then passed through a colloid mill (or similar grinder) to ensure that particulate size does not exceed 130 micron.
Experimentation has shown that a polyacrylate in an amount of the order of from 0.05 to 3.0, more preferably about 0.75, percent by weight is needed to give use to an acceptable sealing effect. Such experiments have also shown that, without the presence of gum rosin, the composition would not be workable, especially at temperatures of around -40°C. At such temperatures the overall composition, without gum rosin, would be too viscous and may even exhibit a degree of brittleness. In fact, at temperatures of that order a reduction in the degree of elasticity would mean that particles within the composition and intended to seal a puncture would not seal properly, exhibiting a tendency to separate from the puncture, as for example due to vibrations, etc. caused by tyre movement.
The use of gum rosin has been found to allow for regulation and control of the viscosity of the overall solution, and in particular the polyacrylate particulate material used for purposes of sealing a puncture. It is possible, as a result of employing the rosin solution, to maintain overall viscosity of the composition at an acceptable level, allowing it to readily travel from the container, through the valve into the tyre and then to the puncture site.
Whilst, as set out in the Example, sodium polyacrylate is utilised, it should be understood that in accordance with the invention any substance belonging to the "family" of elastomeric resins may be employed. This includes those made available by National Starch, in their Elotek range, such as FX 4130 and FL 1212.
In the instance of a puncture occurring in the tyre's shoulder area the formulation must exhibit exceptional sealing capability. This is essential as virtually no liquid is available to flow to a shoulder area puncture site once the vehicle operates above from 3 to 4 kilometres per hour. The liquid will be confined to the internal crown area inside the tyre chamber due to centrifugal force. It is therefore important that the correct combination of selected ingredients be combined in the right ratio to allow the composition to function satisfactorily regardless of the site of any puncture. Preferably the composition should be capable of sealing a puncture caused by, for example, a spike of up to about 6.25 mm diameter.
EXAMPLE 2
Another preferred embodiment relates to a process for preparing a composition for sealing punctures and pneumatic tyres, said process including the steps of : <ol id="ol0008" compact="compact" ol-style=""><li>A. forming a hot phase premix by adding rosin (comprising 1.5% by weight of the final composition) and propylene glycol (comprising 1.5% by weight of the final composition) to a steam jacketed vessel and heating to a temperature of about 100°C until the rosin is fully melted in the propylene glycol, followed by cooling with stirring until a temperature of about 50°C is reached, then adding ethyl alcohol (comprising 1.0% by weight of the final composition), 20% ammonia (comprising 0.4% by weight of the final composition), water (comprising 0.7% by weight of the final composition), polyethylene powder (from 10µm to 180µm in size) (comprising 1.0% by weight of the final composition), diatomite (comprising 0.8% by weight of the final composition), and zinc stearate (comprising 0.2% by weight of the final composition) while continuing stirring;</li><li>B. forming a gel phase premix in a separate vessel by adding, with stirring, sodium polyacrylate (comprising 0.2% by weight of the final composition) to water (comprising 11.43% by weight of the final composition) at a temperature of about 25°C, continuing stirring for up to 15 minutes, then adding with stirring propylene glycol (comprising 3.5% by weight of the final composition), 20% ammonia (comprising 0.07% by weight of the final composition) and a portion of hot phase premix formed by step A (comprising 0.8% by weight of the final composition);</li><li>C. in another separate vessel adding, and mixing with stirring, water (comprising 33.2% by weight of the final composition), propylene glycol (comprising 33% by weight of the final composition), ethylene glycol (comprising 10% by weight of the final composition), 20% ammonia (comprising 0.35% by weight of the final composition), the remainder of the hot phase premix (the total hot phase premix ultimately comprising 7.1% by weight of the final composition), the gel phase premix (after passing through a grinder to reduce the particle size to between 50µm and 2000µm) (comprising 16% by weight of the final composition);</li></ol> then continually stirring the resultant composition for up to 24 hours with ambient temperature being reached.
Formalin (comprising 0.15% by weight of the final composition) may be added during step C. Additionally, opacifier and/or PVA/MA may also be added during step C. While it is preferred to add opacifier and/or PVA/MA, such is not an essential component; the primary role of this component is to render the composition non-clear, although it also assists the sealing function of the composition.
The ethyl alcohol in the hot phase premix assists in storage of that premix, while the polyethylene powder acts as a binder. The diatomite functions as a sealer. The 20% ammonia serves to keep rosin in solution both in the hot phase premix and in the gel phase premix.
EXAMPLE 3
A composition for use in sealing a punctured vehicle tyre, said composition containing the following constituents (with all amounts in percentage of the final composition by weight): <tables id="tabl0006" num="0006"><table frame="none"><tgroup cols="3" colsep="0" rowsep="0"><colspec colnum="1" colname="col1" colwidth="11mm" /><colspec colnum="2" colname="col2" colwidth="110mm" /><colspec colnum="3" colname="col3" colwidth="18mm" /><tbody><row><entry>(1)</entry><entry>propylene glycol</entry><entry align="center">81.0</entry></row><row><entry>(2)</entry><entry>glycerine</entry><entry align="center">1.0</entry></row><row><entry>(3)</entry><entry>xanthan gum</entry><entry align="center">.11</entry></row><row><entry>(4)</entry><entry>Psyllium husk powder</entry><entry align="center">.012</entry></row><row><entry>(5)</entry><entry>carboxymethylcellulose</entry><entry align="center">.03</entry></row><row><entry>(6)</entry><entry>diatomaceous earth</entry><entry align="center">.25</entry></row><row><entry>(7)</entry><entry>gum resin powder</entry><entry align="center">1.35</entry></row><row><entry>(8)</entry><entry>magnesium carbonate</entry><entry align="center">.135</entry></row><row><entry>(9)</entry><entry>rice husk powder</entry><entry align="center">.3</entry></row><row><entry>(10)</entry><entry>titanium dioxide</entry><entry align="center">.075</entry></row><row><entry>(11)</entry><entry>cork powder</entry><entry align="center">.15</entry></row><row><entry>(12)</entry><entry>bark powder (dry)</entry><entry align="center">.1</entry></row><row><entry>(13)</entry><entry>equisetum powder</entry><entry align="center">.1</entry></row><row><entry>(14)</entry><entry>polyethylene powder</entry><entry align="center">.2</entry></row><row><entry>(15)</entry><entry>water</entry><entry align="center">13.176</entry></row><row><entry>(16)</entry><entry>sodium bicarbonate</entry><entry align="center">.05</entry></row><row><entry>(17)</entry><entry>ammonium carbonate</entry><entry align="center">.05</entry></row><row><entry>(18)</entry><entry>sodium borate</entry><entry align="center">1.0</entry></row><row><entry>(19)</entry><entry>formalin</entry><entry align="center">.2</entry></row><row><entry>(20)</entry><entry>fluorescein</entry><entry align="center">.012, and</entry></row><row><entry>(21)</entry><entry>one or more polyacrylates, in an amount of from 0.05 to 2.0 percent by weight.</entry><entry /></row></tbody></tgroup></table></tables>
EXAMPLE 4
A composition for use in sealing a punctured vehicle tyre, said composition containing the following constituents (with all amounts in percentage of the final composition by weight): <tables id="tabl0007" num="0007"><table frame="none"><tgroup cols="3" colsep="0" rowsep="0"><colspec colnum="1" colname="col1" colwidth="11mm" /><colspec colnum="2" colname="col2" colwidth="97mm" /><colspec colnum="3" colname="col3" colwidth="25mm" /><tbody><row><entry>(1)</entry><entry>propylene glycol</entry><entry align="center">up to 82.0</entry></row><row><entry>(2)</entry><entry>glycerine</entry><entry align="center">0.5</entry></row><row><entry>(3)</entry><entry>xanthan gum</entry><entry align="center">0.11</entry></row><row><entry>(4)</entry><entry>Psyllium husk powder</entry><entry align="center">0.012</entry></row><row><entry>(5)</entry><entry>carboxymethylcellulose</entry><entry align="center">0.03</entry></row><row><entry>(6)</entry><entry>diatomaceous earth</entry><entry align="center">0.25</entry></row><row><entry>(7)</entry><entry>gum resin powder</entry><entry align="center">1.75</entry></row><row><entry>(8)</entry><entry>titanium dioxide</entry><entry align="center">0.05</entry></row><row><entry>(9)</entry><entry>rice bran powder</entry><entry align="center">0.45</entry></row><row><entry>(10)</entry><entry>cork powder</entry><entry align="center">0.15</entry></row><row><entry>(11)</entry><entry>bark powder (dry)</entry><entry align="center">0.10</entry></row><row><entry>(12)</entry><entry>equisetum powder</entry><entry align="center">0.10</entry></row><row><entry>(13)</entry><entry>polyethylene powder</entry><entry align="center">0.25</entry></row><row><entry>(14)</entry><entry>water</entry><entry align="center">up to 13.8936</entry></row><row><entry>(15)</entry><entry>sodium bicarbonate</entry><entry align="center">0.05</entry></row><row><entry>(16)</entry><entry>ammonium carbonate</entry><entry align="center">0.05</entry></row><row><entry>(17)</entry><entry>sodium borate</entry><entry align="center">0.10</entry></row><row><entry>(18)</entry><entry>formalin</entry><entry align="center">0.20</entry></row><row><entry>(19)</entry><entry>fluorescein</entry><entry align="center">0.12, and</entry></row><row><entry>(20)</entry><entry>one or more polyacrylates, in an amount of from 0.05 to 2.0 percent.</entry><entry align="center" /></row></tbody></tgroup></table></tables>
EXAMPLE 5
A composition for use in sealing a punctured vehicle tyre, said composition containing the following constituents (with all amounts in percentage of the final composition by weight): <tables id="tabl0008" num="0008"><table frame="none"><tgroup cols="3" colsep="0" rowsep="0"><colspec colnum="1" colname="col1" colwidth="11mm" /><colspec colnum="2" colname="col2" colwidth="96mm" /><colspec colnum="3" colname="col3" colwidth="21mm" /><tbody><row><entry>(1)</entry><entry>ethylene glycol</entry><entry align="center">up to 50.0</entry></row><row><entry>(2)</entry><entry>propylene glycol</entry><entry align="center">up to 12.56</entry></row><row><entry>(3)</entry><entry>glycerine</entry><entry align="center">1.0</entry></row><row><entry>(4)</entry><entry>marsh mallow root powder</entry><entry align="center">2.5</entry></row><row><entry>(5)</entry><entry>Psyllium husk powder</entry><entry align="center">0.35</entry></row><row><entry>(6)</entry><entry>xanthan gum</entry><entry align="center">0.02</entry></row><row><entry>(7)</entry><entry>carboxymethylcellulose</entry><entry align="center">0.01</entry></row><row><entry>(8)</entry><entry>Aerosil R2</entry><entry align="center">0.05</entry></row><row><entry>(9)</entry><entry>magnesium carbonate</entry><entry align="center">0.25</entry></row><row><entry>(10)</entry><entry>water</entry><entry align="center">30.0</entry></row><row><entry>(11)</entry><entry>ammonium bicarbonate</entry><entry align="center">30.0</entry></row><row><entry>(12)</entry><entry>sodium bicarbonate</entry><entry align="center">0.15</entry></row><row><entry>(13)</entry><entry>sodium borate</entry><entry align="center">0.15</entry></row><row><entry>(14)</entry><entry>formalin</entry><entry align="center">0.30</entry></row><row><entry>(15)</entry><entry>fluorescein</entry><entry align="center">0.15</entry></row><row><entry>(16)</entry><entry>gum resin</entry><entry align="center">1.50</entry></row><row><entry>(17)</entry><entry>ethyl alcohol</entry><entry align="center">1.0, and</entry></row><row><entry>(18)</entry><entry>one or more polyacrylates, in an amount of from 0.05 to 2.0 percent.</entry><entry align="center" /></row></tbody></tgroup></table></tables>
Finally, it is to be understood that the foregoing description refers merely to preferred embodiments of the invention, and that variations and modifications will be possible thereto without departing from the spirit and scope of the invention.
Contents11
Every citation, both ways
| Document | Relation | Office |
|---|---|---|
| EP1510329A1 | Cites | European Patent Office (EPO) |
| WO9605048A1 | Cites | World Intellectual Property Organization (WIPO) |
| WO2006038824A1 | Cites | World Intellectual Property Organization (WIPO) |
| US2827098A | Cites | United States of America |
| US3676381A | Cites | United States of America |
| US4588758A | Cites | United States of America |
36 members in 18 offices
Priority claims19
| Document | Office | Kind | Date |
|---|---|---|---|
| 2007905526 | Australia | A | |
| 2007905526 | Australia | A | |
| 2007905526 | Australia | – | |
| 2007905745 | Australia | A | |
| 2007905745 | Australia | A | |
| 2007905745 | Australia | – | |
| 2007906682 | Australia | A | |
| 2007906682 | Australia | A | |
| 2007906682 | Australia | – | |
| 2008001499 | Australia | W | |
| 2008001499 | Australia | W | |
| 2007905526 | – | – | – |
| 2007905745 | – | – | – |
| 2007906682 | – | – | – |
| AU20070905526 | – | – | – |
| AU20070905745 | – | – | – |
| AU20070906682 | – | – | – |
| AU2008001499 | – | – | – |
| WO2008AU01499 | – | – | – |
Members36
| Document | Office | Kind | |
|---|---|---|---|
| AU2008310311A1 | Australia | A1 | |
| CA2701477A1 | Canada | A1 | |
| WO2009046496A1 | World Intellectual Property Organization (WIPO) | A1 | |
| NO20100498L | Norway | L | |
| MX2010003755A | Mexico | A | |
| EP2201078A1 | European Patent Office (EPO) | A1 | |
| US2010222455A1 | United States of America | A1 | |
| KR20100099680A | Republic of Korea | A | |
| CN101848976A | China | A | |
| IL204903A0 | Israel | A0 | |
| JP2010540760A | Japan | A | |
| ZA201002411B | South Africa | B | |
| NZ584808A | New Zealand | A | |
| HK1148768A | Hong Kong, China | A | |
| HK1148768A1 | Hong Kong, China | A1 | |
| RU2010113630A | Russian Federation | A | |
| US8329778B2 | United States of America | B2 | |
| AU2013200060A1 | Australia | A1 | |
| AU2008310311B2 | Australia | B2 | |
| US2013072601A1 | United States of America | A1 | |
| IL204903A | Israel | A | |
| JP5450425B2 | Japan | B2 | |
| AU2008310311C1 | Australia | C1 | |
| CN101848976B | China | B | |
| RU2518743C2 | Russian Federation | C2 | |
| AU2013200060B2 | Australia | B2 | |
| US8895640B2 | United States of America | B2 | |
| KR101494485B1 | Republic of Korea | B1 | |
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| PH12013500847A1 | Philippines | A1 | |
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| CA2701477C | Canada | C | |
| MY161499A | Malaysia | A | |
| EP2201078A4 | European Patent Office (EPO) | A4 | |
| PH12013500847B1 | Philippines | B1 | |
| EP2201078B1This record | European Patent Office (EPO) | B1 |
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Numbers
- Publication
- 2201078
- Publication, DOCDB
- 2201078
- Publication, EPODOC
- EP2201078
- Application
- 88382569
- Application, DOCDB
- 08838256
- Application, EPODOC
- EP20080838256
Titles3
- German
- VERBESSERTE DICHTUNGSZUSAMMENSETZUNG UND VERFAHREN ZUR HERSTELLUNG EINER DICHTUNGSZUSAMMENSETZUNG
- English
- IMPROVED SEALING COMPOSITION AND METHOD FOR THE PREPARATION OF A SEALING COMPOSITION
- French
- COMPOSITION DE COLMATAGE AMÉLIORÉE ET MÉTHODE DE PRÉPARATION D'UNE COMPOSITION DE COLMATAGE
Classification
- CPC, 2
- B29C73/163
- B29L2030/00
- IPC, 3
- C09K3 10
- B29C73 16
- C09K3 12
Designated states38
- Contracting states, 34
- Austria
- Belgium
- Bulgaria
- Switzerland
- Cyprus
- Czechia
- Germany
- Denmark
- Estonia
- Spain
- Finland
- France
- United Kingdom
- Greece
- Croatia
- Hungary
- Ireland
- Iceland
- Italy
- Liechtenstein
- Lithuania
- Luxembourg
- Latvia
- Monaco
and 10 moreShow fewer
- Malta
- Netherlands (Kingdom of the)
- Norway
- Poland
- Portugal
- Romania
- Sweden
- Slovenia
- Slovakia
- Türkiye
- Extension states, 4
- Albania
- Bosnia and Herzegovina
- North Macedonia
- Serbia