Chromogenic coating composition

I \ 49279Α/77

"Precedimene :, ο for the production of carbonless sheets re¬gistrazione pressure sensitive" MK TO THE CO Id * Oratis ON .PAYTQWp Oil (US A *) -AiOOOtS- ·

The present invention refers to produ¬zione * of recording sheets without coal sensi¬bili to pressure, to be used in combination CONUN sensitive transfer sheet at a pressure, of the type for which as a result of application of pressure a color precursor is transferred alfoglio d: recording which then develops unaimmagine visible 'More' particularly, it riferiscealla production of a pressure sensitive senzacarbone recording sheet by using a hot melt siste¬ma dirivestimento to form a composition containing a chromogenic material, ilquale coating is hardened by raffred¬damento. For the purposes of the present patent application, the term "chromogen" must be understood to riferir¬si to chromogenic material such as sviluppa¬tori color,

for example by means of a machine "3 - to write, to break the Chin coating so as to put the precursor freedom hast co¬lora. At this time the precursor of colorefa contact with the CF coating and reacts conlo color developer in it por unaimmagine femur. I »in carbonless paper is dimostrataim means ecce rionalmente valid eli trasferimentodell'immagine for various reasons, one of which is chefino in that a CB coating is placed vici¬no to a CF coating, the CB is that the CF si.trovano in an inactive condition because the non-contact soro ele¬menti co-reactants between them follows a *, directory. of. ^ patents relating s products without carbon paper: At this time the precursor of colorefa contact with the CF coating and reacts conlo color developer in it por unaimmagine femur. I »in carbonless paper is dimostrataim means ecce rionalmente valid eli trasferimentodell'immagine for various reasons, one of which is chefino in that a CB coating is placed vici¬no to a CF coating, the CB is that the CF si.trovano in an inactive condition because the non-contact soro ele¬menti co-reactants between them follows a *, directory. of. ^ patents relating s products without carbon paper: At this time the precursor of colorefa contact with the CF coating and reacts conlo color developer in it por unaimmagine femur. I »in carbonless paper is dimostrataim means ecce rionalmente valid eli trasferimentodell'immagine for various reasons, one of which is chefino in that a CB coating is placed vici¬no to a CF coating, the CB is that the CF si.trovano in an inactive condition because the non-contact soro ele¬menti co-reactants between them follows a *, directory. of. ^ patents relating s products without carbon paper: one of which is chefino in that a CB coating is placed vici¬no to a CF coating, the CB is that the CF si.trovano in an inactive condition because the ele¬menti co-reactants soro not in contact with each other follows * a list. of. ^ patents relating s products without carbon paper: one of which is chefino in that a CB coating is placed vici¬no to a CF coating, the CB is that the CF si.trovano in an inactive condition because the ele¬menti co-reactants soro not in contact with each other follows * a list. of. ^ patents relating s products without carbon paper:

United States Patent ^, 2,717.907 (1 §55) li 11 11 K n * 2.730 * 456 (7956) 11 II u 0 n. 3-.455 = 721 (1969) 11 tt fi "nt * 3 .466.184. (1969) 11 fi «« n. 3,678,935 (1972)

A product of the third generation that tro¬va in an advanced stage of development c messain trading day 4'òggi and that disponibilein some sectors, business is called cartaautonoma, in very general terms, the paper refers mte¬nerli a training system of Im-

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inagine in which just a single coat, face del¬la paper, and the single coating contains both color ilprecursore, generally in incapsu¬lata shape, that the color developer. Pi conseguenzaquando pressure is applied, always medianteima typewriter or other scrit¬tura instrument, the color precursor capsule is in¬franta and reacts with the cir¬costante of color developer to form an image "Both the transfering system dell ' image card without carboneche the autonomous system were subject to unagrande · activities in the field of patents. A typical autogenous sistemadi recording material, sometimes chia¬mato previously "independent" because tut¬ti the elements to form a sign can be found back into an single sheet, is described in U.S. dogli Sta¬ti united nf&gt;, 730,

A drawback of rivesti¬ta paper products, such as those without coal c quelliautonomi, derives from the need to apply unacomposizione liquid coating containing gliingredienti color forming during the manufacture processodi. Nel11 appiica2ione of these rive¬stimenti will sometimes use volatile solvents chea turn require the evaporation of excess

I - 5 - solvent to dry the coating, thereby producendoin of volatile solvent vapors. A coating metodoalternativo involves 1'applicazio¬ne of the color-forming ingredients in an aqueous polti¬glia, requiring always del¬l'eccesso the removal of water by drying. Entrambii processes present serious drawbacks, inparticular the coating method with solventicomporta necessarily the production of vaporidi generally volatile solvent that create a po¬ticelo both for the health of that nell'am¬biente surrounding fire. Also, when it takes action unsistema aqueous solvent, 1'acqua be e-vaporata, which involves the expenditure of quantitati¬vi. significant energy, the esigenzadi also a drying step requires' complex and expensive for use diapparecchiature essiccarecontini! cariente a substrate which has been rive¬stito with a compound of aqueous coating. Unproblema separate but honed involves the smaltimen¬to polluted water resulting from prepara¬zione and from the cleaning of aqueous compositions rive¬stimento, j, 'application of heat not sol¬tanto is expensive, making the complessivadi factory operation ?. product ion less effective from 6 the cost point of view, but it is also potenzialmentedannosa for ingare DIAI you color-forming the qualisono generally coated on the substrate cartadurante manufacture, the problems encountered nel¬lo actual coating step are attributable generalmen¬te the need of a es¬siccamento stage by 'heat that follows 1'operazionedi coating.

Many of the procedimentoo specific advantages of the product of the present invention derivanodal fact that it uses a composition of rive¬stimento hot-melt adhesive to coat the paper substra¬to * This contrasts with the 'rivestimentiutilizzati of the prior art which generally have a ri¬chiesto aqueous coating or insolvent. For the purposes of the present application of brevet¬to, the expression "coating 100JS of sostanzasolida" salacious sometimes used to describe the coating o¬perazione and must be understood ariferirsi to the fact that it uses a hot-melt coating and composizionedi of conseguenzaè it has been eliminated the drying step normal¬mente present in the manufacture of paper and nelrivestimento, Λ this regard it should be noted that you already know ~ 1 ~ 7 for the coating of aqueous systems points esistemi ir solvent 'See for example the United States brevettodegli No, 3,914,511, "the patent degliStati United nf3,016 * 308, the patent states .Uriti n '3,079 ^ 351' patent of Staiti Unitin.3.672.935 and United States patent number 3 * 684 &lt;549. However known as "no ilex re-garments cast shot past was par¬ticolarmente effective.

1 * Pi Consequently exists a need for a sistemaperfezionato eli fusion Chaldeans to coat: foglicl: the card without coal · CP in order to re prepara¬ coated sheets for points. In addition the preferred form direalizzazione tasks; invenzio¬ne of the present relates to a process for AO In produzioneconiim&gt; to: i. without, coal-fired furnace. ' plural, and more par¬ticolarmente to a method for smoothing util unsistema hot-melt material containing svilup¬ color patore dispersed.

Dinners: you can easily understand how pre¬cedo "the continuous production of a product will require multiple car¬te contemporary finish, 1 * simultaneous drying, the contemporary press, and the collection and contemporary unapluralità finishing of paper substrates . Thus the patent CA- δ nadese η »945» 443 indicates that to do this deveesservi a minimum wetting of the water cartamediante sheet I1 during application of a rive¬stimento emulsion. For this purpose it strives unaemulsione high solid substance content, and special es¬siccatori are described in the aforementioned Canadian bre¬vetto. However, because of complessi¬tà the drying step, this procedi¬mento has not been possible until now by puntodi commercial view. More particularly, sta¬dio the drying involving 1'evaporazione delsolvente and, or the evaporation of water it does not allow the heat nonchél'ingresso fabbricazioneRimai tanca or continuous forine plural. In addition allostadio drying that prevents the produzionedi plural forms continues, the need for appli¬care heat for evaporation of the solvent co¬stituisce a serious drawback, that the Ciato; ' aqueous coatings and other coatings liquidirichiedono the use of special types of paper ge¬neralmente expensive, and even these; / porta¬no ​​often to bending, distortion or deformation dellacarta, Ciato that water and other liquids tend apenetrare through the the paper substrate, inol¬tre the aqueous coatings and some tw Hh with solvent-borne coatings are not generally suitable all1ap-fold "ion for points or all '

They are generally only suitable all'applicazio¬ne to the entire surface of a sheet to a continuous coating produr¬re *

Another problem that has arisen commonly neitentativi to manufacture continuously pluri¬me forms has been the fact that the manufacturer of the paper cartadeve design from the point of view of mechanical re¬sistenza and durability in an appropriate manner secure against use in a variety of macchinedi c finishing printing. This requires that the fab¬bricante paper evaluates the apparatus rive¬stimento of forms from him supplied manufacturers, so that the paper can be? mododo designed to adapt all'apparecchiatura'e procedimentoche manifest the most stringent conditions. For que¬sto done, you must use a more eleva¬to ratio of long wood fibers and wood fibers corteda part of how ne¬cessario papermaker for the majority of machines eli re-garment, printing or finishing , OneLevel to obtain high mechanical strength suitable nelprodotto of finished paper. This makes more expensive the ΐ 10 * product in the final sheet, since the lungaè fiber generally more expensive than the short fiber "Esser .- * zialmcuite the separation of cartadal manufacturer of forms} manufacturer which is common today, that the esi¬ge manufacturer of paper with projects unmargine overflow its final product Peruna varieties machines gods, rather than I planned? © appo¬sitamente the paper product for notedelle conditions machines.

Combining the manufacturing operations, stam¬pa and finishing in a single ir 'line system, sirealizzano numerous advantages * First, the .puòessere paper obtained employing ground wood, ottenen¬do a lower ratio between fiber, long and fibracorta than is been made above, a Questorappresenta, 'improvement in costs and quality poten¬zialmente also in the product of cartafinale, tm second advantage that can be ricava¬to combination of dahlia, manufacture, dellastampa and finishing is that the recycled rifiutoo cards, sometimes hairy here "of", puòessere endeavored scrap in the manufacture of gloved paper quality of the paper is not a livelloelevato with margin * in excess. Third, importantly ancorapiù, printing and finis¬saggio delira paper are performed as sepa¬rato functions, a further advantage of the use of com¬posizioni of hot-melt coating and dellacomi; in a "manufacturer's ion, ilex delfinitore printer and the paper is that when disponibilel'opzione the press followed by coating, sivurif j.ciino considerable cost advantages.

It is provided a process for producing a "12 - foci Ilo ili regi s without appreciable coal-traction to the pressure, which comprises the steps of preparing unacomposizione of coating. hot melt, hot-melt coating lacampo3izione essendoinsolubile in water and having a melting point dacirca 60 to about 140 ° 0. The composition of rivesti¬mento a. hot melt includes a chromogenic material * The chromogenic material is a developer of colorefusibile the type of electrons accettoro acid. coating Lacomposizione to vienescaldata hot fusion to vaia temperature above its melting puntodi scalda¬ta and the coating composition is applied to a substrate, the coating being applied with a composizionedi delrivestimento weight of from about 0, to $ 3.63 per 306 delsubstrato leg. The coating composition is in¬durita cooling the coated substrate, 1 lina com¬posizione of nuovotipo liquid chromogen coating is produced "the composition of rivestimentoavendo a melting point from about 60 to about 140 ° Co. comprising about 15-100 &amp; amp; of a chromium-hay material c * about 000% of a rheology modifier del¬la material, the chromogenic material being one svi¬luppatore color of the acid-type fuse accept re eli electrons, a recording sheet sensi- bile breaths pressure is product, the re¬gistrazione sheet comprising a substrate provided with unapluralità of superbiei, at least one of superficiessendo coated with a composition of coating · * chin hardened hot fusion, the medium sospenden¬te hot-melt hardened by including a material dispersed in cramogono it, I&gt; at chromogen del¬la present invention coating composition is essentially a svilup¬patore fuse color insoluble in water. ' IN A LIVE preferred form, materials dellareologia modifiers such as resins, waxes and liquid plasticizers, may be added to improve the coating-biUtà of the coating composition in a hot melt si¬stema to ,; The developer of color and Haterial.i 'rheology modifiers are pre¬feribilmente miscible, or partially miscible informs, fused so that the separation does not occur during composiaiene componentidella lf applicazio¬ne of the coating composition to melt coldMateriali charge, .possono forwards be ag¬giunti to the coating composition, if you de¬sidera ,. The use of solvents that require heat to be eliminated during Ί ' cssiccamento or induri¬mento of the coating composition, is 14 and- vineyard. However, you can tolerate mi¬nori amounts of solvents without requiring one sepa¬rato stage for drying during any stadiocl1 subsequent hardening. As the product andthe process of the present invention are uti¬li in the manufacture of various products, the pre¬ferito use of the method and product of the invention consists in the continuous production presen¬te ofa substrate without, plural coal.

The color developers croniogeni more utilinella putting into practice of the present invenzionesono the aeoettori of phenolic acids and includonomateriali electrons gallate as 2-ethylhexyl, aci¬do 3, fi-dlter * .- butyl-l-salici.ileo, fcnolichedel resins of the type novolac and phenolic materials modi¬ficati. from metal, for example the salt of zinc diacid 3, 5-d.itera.-butyl-s &amp; amp; l: Lcil.ico and resins of the novolak type modified with zinc. The svi¬luppatori more croniogeni favorite color are lenovolaccb.e fenilfcnolo p-p-p-ottiifenolo and third-butylphenol and their modifications with zinc, one can use mixtures of these sviluppatoridi those if you want. The developers of their co * sawmills may be used as single compo¬nente of the coating composition to Fu-13 hot sion provided that the viscosity of the coating composizionealle temperatures both abbastanzabassa to allow that the composition is "* rive¬stita or printed by resorting to desideratoquale method is developed here eli below, and add posso¬no modiPieatori materials of reolo¬gia, scolti so as to lower the viscosity of this front resins * / compounds fenolieà as gallate fi-ethyl esi.iico acid and 3, s- diterzv $-butyl ·: ·.! ici.X ic h: ·;). No generally, ion pro pus point, and net uhaviscosità in. lower melting. In this case, siiagt * lungone »generally water! 1 i d el¬la rheology modifiers chosen so as to raise the visco¬sità composite cuesti. '

Developers. color can be taken * in the coating composition in fusion cal * from nell 'range from about 15 to about IO0 / s in pesodella coating exposure ,, Al 100 # color glisviluppatori work like, in addition to their fusionecalda I run croniogena . The i »ter go of the preferred color developer ne&gt; ii&gt; COI: (day position coating ranges from about 50 to about 100 #, &amp; amp; 1 * cir¬ca most preferred range is from 63 to about 85 #. The material rheology modifiers generated - 16

Such is useful in, putting into practice of presen¬te invention include a wide variety of re¬sine, waxes and liquid plasticizers, in general que¬sti materials rheology modifiers possonoessere non-polar or polar "For polar s * intendeche a certain amount of polarity is carat¬teristici :. of these materials »i .polariessendo materials characterized by the presence of groups, .funzionali selected from the group consisting gruppicarbossili i, cartoon ilici, ossidr ilici, osterei, amide ammanici, heterocyclic and their combina¬ tions, 3 material rheology modifiers pos¬ are vary in viscosity from liquids such as monoiso-prop ìl of £ ~ en and to the low weight polypropylenes mole¬colare ,; Examples of materials modifiers, reo¬logia. which can be used are polietile¬ni and polypropylene, glycols of poly · the onyx, sti¬ro poles! i then. ics te ri, then iacril a ti, the co lo.fon, with the oFon change the designations, polyphenyls, derivatives of fatty acids, waxes 03sa »oliniche, montana waxes, waxes paraffittichee microcristaliine. ' X rheology modifier materials can be present in a quan¬tità from about 0 to about 85 # hee weight of composi¬zione of hot-melt coating, 'b1 interval¬lo preferred ranges from about 0 to about 50% and lf inter- - 17 ** rampart most preferred ranges from about 15 to about 35% del¬la coating composition, '

in¬durimento most preferred range from about 0.5 seconds a.circa g seconds * While hot-melt tions can use compo¬si having a melting range above 15 ° C, the time required perchèuna such; coating composition hardens ri¬chiede equipment and special handling, eutilizza these compositions SHOPKEEPER hot melt - 18 cially unattractive *

The preferred hast cal¬da fusion coating compositions of the present invention have unabassa viscosity when they are in the molten state, to facilitate the distribution on the substrate * ingenerale it is desirable that the composition of ri¬vestimento hot-melt has a viscosity at in¬feriore about 500 centipoise at a temperaturadi about 5 ° above the melting point of the coating composition to unaparticolare fusionecalda. ' It is also preferable that the composizionedi. fusion coating of the present éalda in¬venzione has a clear color to be compati¬bile oin the final paper or the product 'Final materiaplastica that is produced. This significaohe is preferable for the hot fusion 'that questasia white or colorless after application to the substrate to be coated partico¬lare.

Charge Materials can be added al¬la coating composition as opaciz¬zanti agents to reduce the shiny appearance of rivesti'-minds hot-melt hardened and retain the aspet¬to of the substrate. Pi consequence mac¬china a card to be written that has been coated with the coating of the present invention com¬posizione 19 - and that nearby then hardened to a solid provides the im¬pressione to be a coita for scri¬vere machine uncoated, ϊ charge preferitisono materials the precipitated silicas or colloidally typical .fumate.Esempi of the silicas that can be ado¬perato are those from trademark ox! 27 (a precipitated silica * manufactured and put into com¬mercio from PPG Industries, Inc., 1, Pittsburgh, Pennsylvania) Syloid 72 (a silica hydrogel fab¬bricato and sold by VR 'Grace &amp; amp; Co ,, Pivlsion Davison Chemical, Baltimore, Maryland) Ecab "the $ o- (a fumed silica, manufactured and marketed by messain Catto! Corporation Boston, Mas-sachussets) * All these silicas are known for for¬nire color * .ini that bluish dicolore precursors such. for example crystal violet lactone. · However this color fades quickly se¬guito to aging. '' plying the-adjusting sheet obtained by the process (lol¬la present invention, 1.1 nonsvanisce developed color, easily. The material charge, his graziealla large surface area, provides im &lt;aumen¬tata porous film of hardened resin, thereby promoting a more complete transfer rapidoe a precurved oil solution ί&gt; 0 sori of color from a allasuperficie transfer sheet of the record sheet, the. quanti¬tà of filler material can be up to about 15% by weight of the coating composition, and 1 'in¬tervalli preferred ranges from about 1 to about 10% by weight ·' The coating composiaione developed? icedi chromogen color caldoad can be applied to a substrate, for example paper or a pel¬licola plastics, by means of a common coating processes qualsiasidei of car¬ta, such as roll coating, blade omediante to any one of stampacomuni procedures, such as pianografica printing, such incisioneo Flexographic »/ the rheological properties, particolar¬mente the viscosity of the composition of rivestimen¬to, they can be adjusted for each type of ap¬pi! cause through a correct choice of the type legalinstruments relative amounts of rheology modificatoridella materials. Mentre.la dellacomposizione actual amount of hot-melt coating ap¬plicata to the substrate can vary depending on the par¬ticolare desired end product, for the purposes of ri¬vestimento of 1rintervallo paper substrates prati¬co of coating weights for the compositions · dirivestimento colorformers CF dolici present invention 'to - ranging from about 0.09 to about 3.63 kg per 306 m * delsubstrato »1 * preferred range going from circa0,09 to about 2.27 kg por 306 m2 of substrate, e1 * even more preferred range going. circa0,09 approximately 1.13 kg per 306 m2 of the substrate,

* h exposure ef ~ active or the actual cooling time ne¬cessario to harden the composition of rivesti¬mento chromogen depends on several variables, co ¬ me the weight of the coating, the details of color svilup¬patori dellareologia modifiers and used materials, the type of means of raffredda¬mento, the temperature of the cooling medium andother. :

edei preferred application of the procedure; products of the present invention, there is produceuna form without coal plurima in this proce¬dimento a continuous sheet is marked with a mo¬dello on at least one surface. A non-aqueous coating hot afusione, devoid of: solvent ,, delmateriale chromogen is applied to at least, unaporzione of at least one surface of the sheet conti¬nuo-; The coated surface FThe then hardened 'diente cooling me- "The sheet with £ in, up having, the,' ·" * '* hardened rivesi-imento is then combined with' alme- no further fog'l / or continuous that prece¬dentemente o..contemporaneamente has been coated with a ma¬ceri to 1 and "a-ffusiono" aia * e ^ hardened | necliatttc raffred¬damento. a form without -Coke multiple, v ^ hyenas poiottenuta through various phases or collection finis¬saggio. A process and a product dea. gender SO- £ 3 no * n described patent asked today dahlia same applicant (priority USAserie ».684 * 460" '84 .461) *

Mei 11 j&gt; j, iic most preferred action of the continue-chin and products of the present invention, will produce in a continuous manner a form plural *

In this form of} most preferred embodiment a plurality of continuous sheets is made avan¬zare know states, z lalmfen te · to, the same speed, the .fogli - said plurality of spaced-being '·! * and from no other. It is made to advance in rela¬zione of COOPERATION between. of them, only a hypothesis In miglioredelle difogli plurality of continuous sheet is marked with a pattern, andat least one. hot-melt coating does not acmioso, solvent-free, containing the chromogenic material is applied to at least a portion of al¬meno · one of the plurality of continuous sheets, the ma¬teriale in hot melt is then hardened me¬diante raffreddamen.to &gt; 1 vengonopoi radcolti continuous sheets and placed in relation adiacentel'uno respect to each other to create a plu¬rima shape,Critti in altrobrevetto asked on today by the ri¬chiedente (USA priorities n.684.460-684.461 series) ·

The X-IB illustrate the examples. preparation ofa slmile CF coating hot-melt, Λ que¬sto regard it should be noted that in practice effettivagli developers, color are mainly of re¬sine. novo lacquer ..del 3 varieties enol f * 'formai de id: l · · ca substituted "that are galvanized or non-galvanized checonsistono in a mixture of resins and galvanized nonzincate» XI hot melt liquid may be from co¬stituito about 15 ~ 100 $ of these resins and finoa about 83% by weight of a modificatoredella material, rheology. Generally these materials modi¬ficatori rheology can be chosen will vary Daima liquid plasticizers, inert a3to-boiling or non-crystalline solids or mi-ri stalline hero such as resins and waxes with points &lt;jì pu "" halo lower than 110 ° C.

The cured coated cantei is sottopostaa test by placing its superilei · ri vestitocontatto with his face covered with a ri¬vestita paper with contenentiun jelly oil microcapsules marker consists of 18O parts raono eli ~ 25 ir isopropyl-clifenile, 5.3 parts of lactone of violet¬to crystal, 0.62 departed 3,3 "bis ~ (l-ethyl" -2-in3til-inàol * 3-yl) -ftalide, 1.25 departed 3 * NFM-dietileawni "no-7 ~ (n, n ~ d: lbonsxlammino) «f inorano and 0.95 parts di2,3- {i '-phenyl 1-3 * -metìlpìraaolo) -7-dietilaiamino-4 ^ sp iròftalido-croirienc and 122 parts of ^ erogenous inodo¬re * These pairs of sheets converge day imma¬gine equipped with an electric typewriter adope¬rando the "m" character in a. ripe¬titivo a block template, and the intensity of the image is misuratacome relationship between the reflection factor dellasona equipped with image and riflessionedel underlying factor devoid d 'image * elapsed after a 10 minute perio¬do .. Consequently mostly in¬tense images or more . They appear as dark lower values, while higher values ​​indicate debolio images vanished .. This test is called, that of in¬tensità with typewriter and can essereespressa mathematically as follows: RJM, "(100)

K ... or wherein R ,. and the. reflection factor of the area of ​​rounxta guess while R is the factor of re- flex or delia bottom area (image devoid d *) by measuring with an opacimeter Bausch &amp; amp; Lojab * 26 - The following examples illustrate 1f invenzionesenza however limiting "

Example I

A mixture of 15 parts by weight of resin of p-dinovoiacca ottilf enol silicata (4,3'A of &amp; amp; η) e5 parts by weight of novolak resin of p-phenyl-phenol are mixed in a glass metallicoe heated while stirring continuously at 120 ° C. Questoliquido heat is spread on a substrate cartadel weight of 6 kg per 306 m8 with a hot knife perdare a 0,54vkg diresina coating the mixture on the substrate, the coating risultanteprivo be stuck; is has a slight gloss anda faint yellow color, and gives a value hast inten¬sità with Iel machine, to write eli 68,

Example II the following mixture in parts by weight of novolak resi¬ne and binder materials is the mesco * "to in a container · metal and melted in an oven at 120 ° C. The following products are supplied in partiin weight, 761 shares day novolac resin to the p-fertilfenolo22B4 "of novolac resin to the p-ottilf galvanized enol (4.3 / ί Zn) 471" mono: ì sopropil Difen ile ~ 109 · 'Epolene of M-85 (Eastman, a polypropylene • 4 * low molecular weight)

The resulting warm liquid is applied co¬rno coating to a paper substrate which pesa5,9 rivestitole kg of a hot-melt adhesive for ro¬tocalcografia. The rivestitoli contains a heated rotogravure cilindroper attacked chimicamenteper quadrangular machine from 80 lines per centimeter, 150 ° C, and also contains a levigarne ritoscaldato roller. XI mixture of hot liquid resin vie¬ne applied to the paper substrate at the speed of 39 meters per minute to give a weight of 0.22 kg per 306 rivestimen¬to hi2, The intensity of foglioalla typewriter is 83.

Example III a series of coating compositions fu¬sione Warm containing color developers vienepreparata and applied as a coating to a paper like sub¬strato ncll'es, 1. in each case the coating composition is applied with a weight or the coating, of at least 1, 36 kg per 306 mdi paper. The composition of the warm and leIntensità mergers with typewriter for ciascunacarta covered are listed in Table I comesegue:

ìY' J.J 1 u P ; r.) {; rt Ί rpì o li 0) co fi Pi fi r ! Si r •ri rì ri 03 1 ': t; ?! rj 0 o U fi •rì Ki o 01 co 'rt* cv! R h' i-’ 0 '0 -Γκ| •r! (V ri (A il Gì tfl iti « 01 £·ΐ •ri « +’ Pi •'i- ri fa 0 M £ i υ « «J

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From the examples l 'm you can see that various banks * stimoliti CF of the hot-melt type may esserepreparati effectively applied as-rivestimentoin form plural hot-melt, hardened medianteraffreddamento and combined with a CB sheet to produrreun sheet of tracing without coal, in. seguitoa applica®ione pressure, provides a good tra¬sferimento and a irtdnaginc developed sharp, B »quin¬di can use the CF coatings fusionecalda examples!« lli in continuous production, the coal forms without! plural, particularly quel¬le in which 1 CF coatings are applied to points, such as saving * · The only requirement is that an operation of rive¬stimento or hot-melt printing (ie a opera¬zione wherein the coating is maintained at disopradel its melting point).