Polyolefin articles and methods of making same.

A method for making varieties of polyolefin

Full description

Background of the invention

This invention relates to types of modified polyolefin, and to the method of manufacturing these types. In particular, this invention relates to a type of polyolefin showing a modified surface and the method of making this type.

Various compositions of polyolefins are known to be used to form various items. For example, polyolefins are known for their benefits in making fibers that can be formed into woven and non-woven materials. Such materials (general polyolefins) have a relatively nonwettable surface, and when it is desired to use woven material or nonwoven material in an absorbent product such as: a diaper, a bandage, a product for adults with urinary incontinence, training pants, and a women’s pad. Or something similar, it is often preferable for such a material to have a general wettable surface that allows water to pass through it.

In the past, when it was desired to use a woven or non-woven polyolefin material in a personal care product other than a covering material, it was suggested to assist the hydrophilic polyolefin material by performing a surface treatment with a surfactant for the polyolefin. Unfortunately, such Surface treatments are generally persistent in nature, and therefore, the appearance of wetness upon the initial application of the liquid, after the given amount of water has passed through the polyolefin material, the surface treatments tend to wash away the material. Polyolefin. Obviously, after the surface treatment has washed the polyolefin material, the polyolefin material in general will not be able to show a wet (hydrophilic) surface and instead show its natural hydrophobic surface. When using polyolefin materials in products Personal care, such as diapers, will likely be required to pass relatively large amounts of urine fluid and will be exposed to several complications in urine fluid. When polyolefin products are of the surface-treated type used in diapers, they are In general, she is able to pass urine at least once, but her ability to pass urine the following times is weakened.

Since diapers in general are exposed to urine three or more times; Surface-treated polyolefin materials have generally been shown to be suitable for use in certain applications.

Accordingly, attempts have been made to improve the surface treatment of polyolefin materials, so that the surface treatment is generally stable, and thus wet polyolefin fibers are treated with fixed principles.

For example, US Patent No. 4,578,414 issued on March 25, 1986 to Sawyer was directed to wettable olefin polymer fibers, where the olefin fibers were made wet by the incorporation of at least one wetting agent in which a group includes (a) Alkyoxylated alkyl phenol with a mixture of mono-, di- and/or triglycerides mono-di, and/or tri-glyceride, or (b) polyoxalkylene fatty acid ester, or (c) a mixture of (b) with any part of (a). The invention differs from the previous patent in that the surface active agent is incorporated directly into the polymer resin mass, preferring this to the introduction of a covalent polymer or the application of a surface treatment to the synthetic fabric of fabricated fibrous.

When the surface active agent is incorporated directly into the block polymer resin, the surface active agent will transfer to the surface of the formed item and make the surface wet.

This method is accompanied by certain disadvantages. First, the process of mixing the surface active agent into the polymer during normal mixing represents a separate process that increases the cost of the final product. In addition, the choice of surface active agent is limited because it must be able to mix at high temperatures and must To exhibit the desired transfer behavior and not become isolated.

General description of the invention

It is desirable to produce a variety of polyolefin that has a modified surface, for example hydrophilic, which is more stable than known polyolefin classes that have such a modified surface. In addition, it is desirable to provide a method for modifying the surface of the polyolefin.

These goals, and others related to them, were implemented by heat fusing to split a covalent polymer material into a general hydrophobic polyolefin. The covalent polymer material includes a general hydrophobic part and a hydrophobic part

The modified portion is mostly insoluble in polyolefin. The general hydrophobic part is mostly dissolved in polyolefin.

Thermal incorporation of the covalent polymer into polyolefin provides a surface-modified transfer to the polyolefin that is generally stable.

On the other hand, the invention relates to a method for producing hydrophobic general polyolefin with a modified surface, which method includes contacting the hydrophobic general polyolefin with a copolymer, when the hydrophobic general polyolefin is at a temperature higher than its glass transition point and the copolymer includes It consists of a general hydrophobic part and a modified part. The general hydrophobic part dissolves in polyolefin, but the modified part does not dissolve in it. In a preferred and particular embodiment of this invention, polyolefin fibers having a hydrophilic surface are prepared by extruding hydrophobic polyolefin into fiber form, and upon exiting the general hydrophobic polyolefin from the extrusion die, it immediately comes into contact with the aforementioned copolymerization material, and upon At the point of contact, the extruded hydrophobic polyolefin melts and the polyolefin matrix is swollen. Contact of the polyolefin with the copolymer material at this stage is beneficial in producing a fabric with a stable, hydrophilic surface.

Brief explanation of the drawings:

Figure (1) Perspective drawing of the test device used to determine surface flow measurements.

Detailed description:

This invention relates to a type produced from general hydrophobic polyolefin. This type has a modified surface. In addition, this invention contains the method by which this type can be produced.

Polyolefins are known to specialists in this field, and any polyolefin capable of being manufactured into grades is suitable for use in this invention. As an example, the polyolefins suitable for use in this invention are homopolymers and copolymers containing repeating units consisting of one or more aliphatic hydrocarbons containing ethylene, propylene, butene, pentene, hexene, heptene, octene, 1 ,3-butadiene, 2-methyl-1,3-butadiene and similar ones, and polyolefins can be of

High or low density and polymers with linear chains or branched chains.

The polyolefins described above are generally hydrophobic in nature. As used herein, the term hydrophobic refers to materials that have a water-air contact angle of at least 90. For the purposes of this application, the contact angle measurements published by Judd and Stromberg in Good and Stromberg in (1079), Surface and Colloid Science & Vol II (Plenum Press).

According to this invention, polyolefin articles consisting of hydrophobic polyolefins are treated with a copolymer to produce a modified surface on these articles. “Modified” surface means a polyolefin surface that has been treated according to the method of this invention exhibiting properties not exhibited by untreated polyolefin, in particular in a preferred embodiment the modified portion is hydrophilic which causes the treated polyolefin to exhibit a hydrophilic surface. While untreated polyolefin shows a hydrophobic surface, treated polyolefin can show a hydrophilic surface, and while the reference to the modified part is that it is hydrophilic, it is known that other modified parts can be used. For example, other modified parts can be water-resistant. Abrasion resistant, abrasion resistant to chemicals, or water repellent. As used here, the term “hydrophilic” refers to a substance that has a contact angle for water in the air of no less than 90, and is determined as shown above, linking it to the definition “hydrophobic”. In addition, as used here, the term “copolymerization” refers to a substance A polymer made up of two or more monomers.

The copolymer material used in this invention can be a linear polymer or a branched-chain polymer, and moreover it can be a random copolymer, a block copolymer, a graft copolymer, or the like.

Copolymer materials contain at least two different parts, one part being hydrophobic and the other being the modified part, for example, water-loving. The part in particular can be considered water-loving or hydrophobic when the homopolymer consists of the repeating units of this part to produce a polymeric compound shown in the order Hydrophilic property or hydrophobic property as defined

In this document, the hydrophobic parts of the covalent polymer material are dissolved in the polyolefin present in the polyolefin class, and as used here, the hydrophobic part in particular is considered to be dissolved in the aforementioned polyolefin when the homopolymer consisting of the repeating units of this part is in areas of interactions. The aforementioned polyolefin. For the purposes of this application, the range of polyolefin reactions is determined by the Hansen solubility parameters published by BH. Knox in “Bimodal Character of Polyester-Solvent Interactions”. the first. Evaluation of dissolution criteria for aromatic and Aliphatic Ester Residues Poly (ethylene Terephthalate) - Journal of Applied Polymer Science (1977) 225-247 .of Applied Polymer Science, Vol. 21, pp and the binary property of polyester solvent interactions II.Bimodal Character of Polyester-Solvent Interactions II

Evaluation of the chemical structures of Aromatic and Aliphatic Ester Residues of Poly(ethylene Terephthalate) - Journal of Applied Polymer Science (1977) 249 - 266. Journal of Applied Polymer Science, Vol. 21 pp. - Third. Bimodal Character of Polyester- Solvent Interactions III. And the effects of morphology on the nature of the interaction of nonaqueous solvents with the Aromatic and the Aliphatic Ester Residues of Poly(ethylene Terephthalate) - Journal of Applied Polymer (1977) 267-276. Science, Vol. 21, pp. The same categories and references mentioned and included in other references in a comprehensive manner. In the above-mentioned categories, Knox discusses the areas of reactions in polyester terminology and the study specifically defining the areas of reactions of polyesters can be applied to polyolefins by experts in this field.

For example, when the polyolefin is polypropylene, the overall hydrophobic fraction that is soluble in the polyolefin must have solubility parameters (dispersion, polarity and H-bonding) that fall entirely within the range shown below. This range is calculated using: Hexane is the kinmong of the aliphatic hydrocarbon (dispersity = 7.24, polarity = zero, hydrogen bonding = zero) connected to the radii of the aliphatic precipitate polyethyleneterephthalate in the classes described by Knox mentioned previously. Dissolution standards define the reaction range.

<img file="SA250B1_D0001.tif" />

As a general rule, the solubility of the general hydrophobic part can be confirmed if the aforementioned part contains one of the repeating units found in polyolefin from which the polyolefin class is composed. For example, if the class to be treated includes polyethylene and has repeating units representing the formula

next :

<img file="SA250B1_D0002.tif" />

The solubility of the general hydrophobic part can be verified by containing repeating units represented by the following formula:

<img file="SA250B1_D0003.tif" />

These repeating units are exactly the same as the repeating units found in polyethylene. Likewise, when the structure of the repeating units of polyolefin is similar to the hydrophobic part, dissolution is likely to occur. Therefore, the hydrophobic parts containing repeating units can be represented by the following formula:

<img file="SA250B1_D0004.tif" />

In general, it is a placeholder in polypropylene, as shown in the following formula:

<img file="SA250B1_D0005.tif" />

Examples of other parts suitable for use as hydrophobic parts are saturated hydrocarbons, mono or polyunsaturated hydrocarbons, functionalized hydrocarbons or the like.

The general modified portion must not be dissolved in the polyolefin of which the polyolefin variety is composed.

As used here, the modified portion will be considered insoluble in the polyolefin when the polymer is formed

The homolog of the repeating units of this part mentioned in the field other than the polyolefin reaction. Again, the reaction field for polyolefin in particular can be determined as described by Knox.

For example, when the polyolefin is polypropylene, the overall modified fraction of the hydrophobic polyolefin that is not dissolved in the polypropylene, the solubility parameters (dispersity - polarity - hydrogen bonding) must not fall into the range described previously.

In particular, when the polyolefin variety contains polypropylene as shown in the previous formula, the general modified hydrophobic fraction can be represented by the following formula:

<img file="SA250B1_D0006.tif" />

Therefore, when the polyolefin is polypropylene, the appropriate copolymerization material for use in this invention can be represented by the following formula:

<img file="SA250B1_D0007.tif" />

In the above example, the repeating unit in parentheses that precedes the letter

<img file="SA250B1_D0008.tif" />

or

<img file="SA250B1_D0009.tif" />

Where Z and

Other examples represent modified parts of copolymerized materials such as:

N≡CF3)×, (CF2)x, (SO3)-X+, SiO2, COOH, OH, NO2, c) and the like, and a model for the +S03)-X part is Na+(SO3), such as sulfonated castor oil. (in the form of sodium salt). The exact test for the copolymerization agent used when processing polyolefin in particular can be determined relatively easily through practical experience, and the requirements are that the copolymerization

Containing at least one general hydrophobic part soluble in polyolefin, and at least one general part

Modified and generally preferred, it is hydrophilic and does not dissolve in polyolefin. It should be understood that copolymerization materials may contain two or more general hydrophobic parts and/or two or more hydrophilic parts, and that it is preferable for the copolymerization material to have an average molecular weight (Mw) of less than about 10,000. To simplify the application, it is It is more preferable for the copolymer to be in a state at room temperature (23°C) that thermally incorporates the copolymer to the polyolefin. As used, the term thermosetting refers to the state in which the copolymer material is in contact with the polyolefin grade when the contacting polyolefin is at a temperature higher than its glass conversion temperature, referring to the surface contact of the polyolefin grade in which It involves the local use of the copolymerization material on polyolefin and not mixing it with all the polyolefin material. It has been discovered from applications that the temperature of fusion of polyolefin and the copolymerization material, as shown here, produces polyolefin with a modified surface that is more stable than polyolefin with a modified surface that was not formed by thermal fusion.

Without linking to theories, hypothetically, the thermal melting of copolymerization materials occurs with the polyolefin types. Hydrophobic parts are dissolved in the polyolefin type, and the entanglement in the polymeric chains of the aforementioned polyolefin occurs, and the modified, insoluble parts of the copolymerization materials do not dissolve in the polyolefin and remain on the surface of the polyolefin type. Thus In this way, the modified parts give modification, for example the hydrophilicity of the polyolefin surface. Thermal melting differs from the known agglomeration methods described, for example, in US Patent No. 4,578,414 described previously. According to the known blooming methods, the wetting agent is incorporated into the molten polyolefin material, which is expected to agglomerate with a surface. Fibers consisting of a mixture of polyolefin and a wetting agent. The wetting agent must be chosen so that it shows the well-known agglomeration phenomenon. Not all wetting agents show this behavior. For example, if the wetting agent ABA is a block copolymer in which the A block is hydrophobic and the hydrophilic block B is unable to agglomerate due to the force of the side of the A block to the polyolefin habit.

In addition, it is believed that a certain amount of the majority of the wetting agents will generally remain in the polyolefin and will not agglomerate on the surface, so high concentrations of the wetting agent must be used to obtain the desired degree of wetting even if it is necessary to use all the wetting agent for thermal melting of the material. Copolymerization with polyolefin This invention does not require the use of materials that agglomerate, and it is believed that it is more beneficial to use copolymerization materials.

When the modified part is hydrophilic, thermal fusion of the copolymer materials with polyolefin in general produces a hydrophilic surface that is more durable than known methods. However, the hydrophobic parts of the copolymer melt can become free to crosslink with the polyolefin and are

Washed 0

This is likely to happen if the general water-loving part of the copolymerization material has a strong aversion to water. In such a case, when polyolefin types are treated with the aforementioned copolymerization materials and placed in a water medium, the force of attraction of the water-loving part is stronger than the forces of adhesion of the hydrophobic part. With polyolefin, there is a release of the hydrophobic parts of the polyolefin which allows the copolymerization material to pass into the water.

It is believed that it is preferable to use the A-B-A agglomeration of the copolymers in this invention,

In particular, since the two agglomerates A are dissolved in polyolefin, the hydrophilic agglomerate B is more attached to the polyolefin. One way to determine that the copolymer contains a hydrophilic portion whose stability is undesirable is to measure the surface tension of the aqueous phase in which the polyolefin was washed. If the copolymerization materials are unstable and moved away from the polyolefin, the surface tension of the aqueous phase will decrease. In this way, we can compare the stability of different surface treatments. This assumes, of course, the first presence of the given amount that is not sufficient for the surface treatment, and if the amount is excessive for the surface treatment. This excess will be washed off.

The polyolefin variety containing a thermally fused copolymer according to this invention is considered to be more sturdy and stable than a similar polyolefin class containing a non-thermo-fused copolymer, and therefore, according to this invention, the polyolefin variety can withstand repeated washing/drying cycles. While maintaining wetness and without reducing the surface tension of the washing water, more than one type

Polyolefin containing copolymer materials without heat melting. The specific test method is used to perform the washing/drying cycles shown below and supported by examples.

As a general rule, it is preferable that the polyolefin grades according to this invention be able to withstand at least three washing/drying cycles as described below and supported by examples, without losing their hydrophilicity. Optionally, it is generally preferable for polyolefin products to withstand 3 wash/dry cycles without reducing the surface tension of the wash water used in the third cycle by more than 5 dyne/cm, and at least 3 wash/dry cycles without reducing the surface tension of the wash water used in the third cycle more than 5 dyne/cm. From 3 dyne/cm. Optionally, it is preferable that the polyolefin grades according to this invention be capable of performing at least the 3 washing/drying cycles described below in relation to the examples and without eliminating more than 20% of the copolymer material originally incorporated by heat with the polyolefin grade.

The methods of forming polyolefins, of which the polyolefin varieties are described in this invention, are known to experts in the present field, and the methods of forming copolymer compounds forming the surface treatments of this invention are similarly known. In addition, there are many copolymer compounds suitable for use in this The invention is commercially available, and this will be discussed in detail later with examples.

In a preferred embodiment, the copolymerization materials of this invention have hydrophobic universal moieties and hydrophilic modified universal moieties ranging from 1:5 to about 5:1, and preferably from about 2:1 to about 1: 2 In the case where the concentration of the general hydrophobic parts is low compared to the number of modified hydrophilic parts, it is assumed that the copolymerization compounds are more unstable due to the strong attractive forces between the hydrophilic parts and water as a result of the relatively large number of hydrophilic parts. Otherwise, there With a relatively large number of general hydrophobic parts compared to the number of hydrophilic parts, copolymerization compounds are generally more stable (the surface may be less hydrophilic). This, of course, depends on the degree of solubility between the general hydrophobic parts and the polyolefin, and also on the degree of water affinity for the water-loving parts.

As a general rule, it is desirable for modified hydrophilic molecules to have molecular weights from about 45 to about 3000 and preferably from about 150 to about 2000.

The hydrophobic parts should have molecular weights from about 75 to about 3000, preferably from about 0.75 to about 2000. If, for example, the molecular weight of the hydrophobic part is less than 75, then the part lacks the appropriate chain length to dissolve and crosslink with the polyolefin, and in such a case, the copolymerization material is not desired to be unstable. Otherwise, if the weight If the molecular molarity of the hydrophilic modified fraction is greater than 3000, the copolymerization material can be strongly hydrophilic and again can be unstable in its hydrophilicity.

The copolymerization materials in this invention can use polyolefin species in appropriate quantities in order to give the polyolefin species the desired surface modifications. The amount of copolymerization material applied to the polyolefin species depends on various insulators, including the relative effectiveness of the modified parts, and the ratio of the hydrophobic parts to the hydrophobic parts. modified in copolymerization materials and the relative insolubleness of the modified parts (the more undissolved modified parts in polyolefin, the greater the number of modified parts remaining on the surface of a product Polyolefin) and the like.

However, as a general rule, copolymerization compounds from polyolefin grades will be used such that the concentration of the modified fractions present on the surface of the polyolefin grade represents at least about 0.1% of the total surface area, and preferably at least about 2. 0% of the total surface area:

On the other hand, this invention relates to a method for producing a type of hydrophobic general polyolefin with a modified surface. The method includes the step of contacting the surface of the item containing a general water-repellent polyolefin with a copolymerizing material containing a general hydrophobic part and a modified part, and the general hydrophobic polyolefin and a substance. Copolymerization has been described previously. The surface of a polyolefin grade contacts the copolymer when the polyolefin is at a temperature higher than its glass transition temperature. The method in which the polyolefin and the copolymer are in contact while the polyolefin is at

A temperature higher than its glass transition point is suitable for use in this invention.

In a preferred embodiment of the method according to this invention, the polyolefin and the copolymer are in contact immediately after the polyolefin is extruded. For example, when it is desired to form polyolefin fibers that exhibit hydrophilicity, it has been discovered that it is particularly preferable to make material contact.

Copolymerization (containing a modified hydrophilic portion) with polyolefin immediately after extrusion, for example in the form of fibres.

In another embodiment, the aqueous solution of the copolymer may be sprayed onto the polyolefin as it emerges from the end of the die. Such a process has been found to produce polyolefin characterized by a stable, non-fugitive, hydrophilic surface. In particular, as the polyolefin emerges from the die, it presents a phenomenon known as Experts in this field call it swelling (swelling) of the mold, and mold swelling refers to the state in which the material emerging from the mold is under pressure and expands after it is extruded. By contacting the polyolefin with the copolymer material, the polyolefin has undergone a template swelling process, and therefore it is believed that the best crosslinking takes place between the polyolefin and the general hydrophobic parts of the copolymer material.

However, it is known that it is not necessary for the polyolefin to come into contact with the copolymer during the polyolefin mold swelling process as long as the polyolefin and the copolymer are in contact when the polyolefin is at a temperature higher than its glass transition temperature.

In a situation where the copolymer is applied to the polyolefin as it emerges from the mold in the form of fibres, the copolymer suitable for application to the polyolefin is in the form of an aqueous solution or dispersion containing about 0.1-10, preferably about 0.5 3.0 weight percentage of the copolymerization compound from the total weight of the aqueous solution. Optionally, the included item can be shaped and cooled

Polyolefin to a lower temperature is the glass transition temperature of polyolefin. Then the copolymerization material can be applied to the surface of the item, and the item is heated to a temperature higher than the glass transition point of polyolefin. As a general rule, higher temperature requires less time to create the desired degree of crosslinking between the hydrophobic part and the polyolefin.

On the other hand, the patent applicants discovered that the polyolefin fibers treated with a copolymerizing substance in accordance with this invention have an improved index, which is that the polyolefin types of this invention, when they are in the form of cross-linked or non-textile fibers, have a softer texture than similar polyolefin fibers that are not treated with materials. Copolymerization according to this invention. Hypothetically, and without being linked to this hypothesis, this improvement indicator occurs as a result of reducing the coefficient of friction between the fibers themselves as a result of the presence of the copolymerization material. To some extent, the improved index is the result of the presence of copolymerase, and again, it is...

The important thing is that the copolymerization material is generally stable, so that washing does not remove the copolymerization material, and thus the desired softness index is removed.

Modified polyolefin fibers containing a hydrophilic surface according to this invention have been found suitable for use in personal care products such as diapers, adult incontinence products, feminine napkins, bandages, and the like.

In these uses, the polyolefin according to this invention has a non-woven structure, such as a molten, swollen threadlike structure and the like, and the non-woven structure generally has a density of about 0.005 to about 0.3 g/cm3. Such a non-woven structure can be used in diapers other than the back cover, as the non-woven structure will allow urine to pass multiple times. Diapers and similar products in general are described in United States Patent No. 4,710,187 issued on December 1, 1987. By Boland and others, Patent No. 4762521 issued on August 9, 1988 by Roessler and others, Patent No. 4770656 issued on September 13, 1988 by Proxmire and others, and Patent No. 4798603 issued on January 17, 1989 by Meyer and others. These references have been incorporated into the reference of this document.

This invention can be better understood by referring to the following examples (including comparative examples), as these examples in no way place limits on the scope of the invention described in the example protection elements:

In all of the following examples the following test steps are used, and all percentages are by weight except where specifically noted.

Drainage test (flow)

Figure 1 shows the device used in drainage measurements, and by referring to Figure 1 therein, the inclined platform 10 is produced, and the platform 10 includes a base 12 and an inclined surface 14 having a width of 14 inches and a length across the transverse center line of 22 inches, and the inclined surface 14 is inclined at an angle of 30, at The edge of the base 16 of the inclined surface 14 and barriers placed 18 Barrier means have a V shape, and the V-shaped preventive barriers 18 are used as a funnel for the liquid flowing under the inclined surface 14 in a hole 20 in the center of the V-shaped barrier 18, and above the inclined surface 14 a distribution funnel is suspended. dispensing

funnel 22, and the dispensing funnel 22 is prepared to hold 0.1 mm of liquid, and this liquid can be passed through the valve 24 to the inclined surface 14, and the height of the valve 24 is adjusted above the inclined surface 14 to allow 10 mm to be filtered between the valve 24 and the tested sample when it is in a position on Inclined surface 14.

Prepare a general rectangular test specimen with a width of 32.02 cm (8 inches) and a length of 1.38 cm (15 inches). The test sample is fixed on the inclined surface 14 with adhesive tape at its four corners. The general test sample is centered on the inclined surface 14 and the funnel 22 is placed approximately at a distance of 200 mm (7.8 inches) from the lower edge of the test sample and transversely to the aforementioned sample. The valve (24) is placed approximately 10 mm above the top of the surface of the test sample. 100 mm of water at a temperature of 35 C is placed in the funnel 22. A collection tool is placed under the hole 20, and the valve 24 is opened to distribute the 100 mm of water in the funnel 22 in a period of about 15 seconds. Then the amount of water drained is collected in the collection tools, measured and recorded.

Wash/dry cycle

Prepare a general rectangular test sample with a width of 32.20 cm (8 inches) and a length of 38.1 cm (15 inches). The test sample is placed in one liter of water at room temperature (about 23°C) for two minutes while stirring at a rate of 15-20 minutes. Revolutions per minute by mechanical flap. A test sample is removed from the wash water, the excess liquid is returned to the wash water, the sample is subjected to air drying overnight, and the process is repeated as many times as desired. The surface tension of the washing water is determined after each washing/drying cycle using the pure water used for each washing/drying cycle. The surface tension is determined according to ASTM Test Method No. 60-1590-d using a Fischer TM Tensionmeter.

Example 1: Swollen polyethylene and polypropylene melt nets are manufactured in the following manner:

Polyethylene pellets are commercially available at Dow Chemical under the brand name Aspun TM, and polypropylene pellets are commercially available from Himont under the brand name PE015. The pellets are dried in a whit lock dryer ( Air dryer (desiccated for at least two hours at 220 F, then the pellets are transferred to the Johnson Plastics Extruder and extruded in the melt blowing process, and the meshes are formed

Meltblown under slightly different conditions is mentioned preferably in Table 1. When the polymers emerge from the olie tip, an aqueous solution consisting of one or more of the following materials is added to them: &amp; Mapeg &amp; CO - 8) Mapeg TM) &amp; ethoxylated castor oil, which is commercially available from &amp; Mazer Chemical under The commercial label (8-CO), Mapeg TM (400-DO) and ethoxylated dioleate are commercially available from Mazer Chemicals.

The concentrations of the various materials present in the aqueous solution are shown in Table 1. The aqueous solutions are sprayed on the polymer when it emerges from the head of the mold in the molten state. The aqueous solutions are sprayed on the molten polymer using a hand spray boom, and these solutions are passed to the hand sprayer using a Master Flex pump. Flex TM Pump, and the spraying is done so that every gram (1 ounce) of polymer receives about 2.83 grams (1 ounce) of aqueous solution. All networks have basic weights shown in the table

No. 1.

Control samples of blown polyethylene melt (sample 1) and polypropylene melt (sample 2) networks are prepared without adding any aqueous solution when the polymer comes out of the mold head, and the different conditions for forming the polymer used are shown in Table 1.

<img file="SA250B1_D0010.tif" />

Polypropylene = pp, Polyethylene = 1PE

The prepared samples are subjected to the drainage test and washing/drying cycle test described previously, and the results of these tests are shown in Table 2.

<img file="SA250B1_D0011.tif" />

*Not an example of this invention 1 Recorded as a change in surface tension in dyne/cm.

2 recorded as millimeters combined

As is apparent from the reference to Table 2, the test samples in accordance with this invention release some amounts of copolymerizing substance during the washing/drying cycle. Accordingly, the drainage data shows samples that remain wet. Non-wet samples (2.1) cause substantially all of the water to drain from the test sample and be collected. Wet samples according to this invention (3.6) allow water to pass through them and remain trapped by the test samples. This is true even after three washes. Example 2:

The fiber-shaped sample grids of polypropylene represent a basis weight of 23.7 g/m2 (0.7 oz/yd2), post-forming and curing by immersing the samples in an aqueous solution containing 2 weight percent of 8-CO to the total weight of the aqueous solution, and placed after The samples are placed in an oven at which the temperature is raised (-

250 F (-250 F) is above the glass transition temperature of polypropylene for a period of about 15

second; Control samples for polypropylene nets are also prepared. The control nets are either untreated or treated with non-ionic surfactants that are commercially available from Rohm and Haas.

Ha as under the trade name Triton TM

Several samples are not subjected to heat treatment after the glass transition point of polypropylene, and the samples are then subjected to the drainage test described previously. The results of this test are shown in Table (3).

<img file="SA250B1_D0012.tif" />

*Not an example of this invention is 1 recorded as combined millimeters.

2. Perform the washing as shown in the washing/drying cycle test method

As shown in reference Table 3, according to this invention there are low drainage values after the first wash, and this shows the endurance property of the surface treatments of this invention. Control samples that have low initial drainage values have high drainage values after the first wash as a result of the intolerance property of the surface treatments.

Experts working in this field will realize that this invention is subject to several amendments and changes without departing from this field, and therefore the detailed description and examples shown before are for the purpose of clarification and not to limit the scope of the invention in any way, which was explained previously and in the following elements of protection: