DE1619206B2 - COATING LATEX FOR WOVEN FABRICS AND THEIR USE - Google Patents

Description

The invention relates to a coating latex for woven fabrics, consisting of the aqueous latex a copolymer of vinyl acetate, ethylene and another comonomer and its use for Applying a water- and solvent-resistant coating finish to woven fabrics for improvement the handle and the fall of the fabrics.

Coatings, ζ. Β. single-sided coatings, and Finishing of woven fabrics are well-known working methods for which various compositions have already been made have become known and are also in practical use. However, it is used to For the best results it is important that the coating or finish is water and solvent resistant is and firmly adheres to the fibers of the woven fabric, so that they can be washed or dry cleaning is not removed from the woven fabric. It is therefore desirable to use coating or having finishing agents which remain on the woven fabrics and are intended for them Serve purpose after many washes or dry cleanings. Try to meet these requirements have often resulted in the application of relatively complicated and expensive compositions, which are necessarily increase the cost of the finished product.

From DT-AS 11 27 085 latices are known which contain copolymers of vinyl acetate and ethylene, have ethylene contents of 4% and more and also other copolymerizable compounds may contain. These latices can be used for coatings, adhesives, paints, etc. will. However, there is not the slightest indication in this prior art that when using a further polymerizable compound, particular advantages can be achieved and that a latex preparation is obtained with N-methylolacrylamide, which is applied to woven fabrics can be and gives these an extremely satisfactory handle, the Finishing is characterized by a very high resistance to washing and cleaning

In GB-PS-9 83 205 are stable emulsions of polymers from 'N-methylolacrylamide and copolymerizable Compounds, such as vinyl acetate, known to be used for coating non-porous substrates, such as wood or metals or foils or sheets of plastic materials come into question. While it is this reference the possibility of the formation of copolymers of numerous N-methylol-substituted amide-like materials too remove; monomeric N-methylolacrylamide and a comonomer made from vinyl acetate as copolymer components However, they are nowhere specifically mentioned. There is also a major difference from the fact that, according to this prior publication, a further component in a prepolymerized state is present, namely an alkaline earth salt of a «, / S-unsaturated monocarboxylic acid in an amount by weight of up to to 10 percent by weight Due to this salt, the previously known polymer shows fundamentally different Properties. This prior art also provides a coating latex for woven fabrics is particularly well suited and gives these advantageous properties, not to be found.

The object of the invention is thus to provide an improved coating latex for application To create woven fabrics that give these fabrics the desired properties, but very durable is against washing and cleaning and at the same time is economically attractive

The invention therefore relates to a coating latex for woven fabrics, consisting of the aqueous latex of a copolymer of vinyl acetate,

Ethylene and another comonomer, which is characterized in that it is a copolymer Copolymer of vinyl acetate, ethylene and N-MethyloL-acrylamide, wherein the ethylene content of the copolymer is 5 to 40% and the N-methylolacrylamide 0.5 to 10%, based on the vinyl acetate, is colloidally suspended

The use according to the invention gives woven fabrics, regardless of whether they are made from natural fibers, such as Cotton, wool, linen, etc., or made of synthetic materials Fibers such as cellulose acetate, nylon, dacron and the like, or from mixtures of natural and / or synthetic fibers have the desired feel and case by applying the polymer latex according to the invention with properties which are described below and drying the latex to drive off its liquid component leaving behind a layer of water and solvent resistant polymeric coating on top of the woven Material.

The latex used according to the invention contains, as the polymeric component, a mixed polymer Vinyl acetate and ethylene, which are co-copolymerized with N-methylolacrylamide. This is suitable to polymerize with the vinyl acetate and ethylene containing starting copolymer and under to cross-link the action of heat. That

Vinyl acetate-ethylene-N-methylolacrylamide copolymer has an ethylene content of 5 to 40%,

preferably 16 to 40%, and the amount of the N-methylolacrylamide is 0.5 to 10%, based on the vinyl acetate The particle size of the copolymer particles should be 0.1 to 2 μm, preferably 0.1 to 0.25 μm, and the copolymer has an inherent viscosity of 1 to 2.5 dl / g.

This mixed polymer is applied to the woven fabric material in the form of an aqueous latex, which is the Contains mixed polymer in the disperse phase, applied

The coating latex is light by copolymerization of vinyl acetate, ethylene and N-methylolacrylamide to be prepared in aqueous dispersion. The N-methylolacrylamide readily copolymerizes with the Vinyl acetate and ethylene to form a mixed or terpolymer and, as mentioned, is suitable for this initial polymerization with the application of heat in the processing of the fabric further increases react and crosslink the copolymer. A vinyl acetate-ethylene-N-methylolacrylamide mixed polymer latex is particularly suitable, which is prepared by the following procedure.

Vinyl acetate and ethylene are taken in the presence of N-methylolacrylamide in an aqueous medium Pressures not exceeding 100 atm and copolymerized in the presence of a catalyst and at least one emulsifier. The aqueous system is adjusted to a pH of 2 to 6 with a suitable buffer held and the catalyst added in portions. The process works in batches and begins with a homogenization period in which the vinyl acetate suspended in water in the presence of Ethylene is mixed well under the working pressure to form a solution of the ethylene in the vinyl acetate to close to its solubility limit under the conditions that exist in the reaction space Achieve while the vinyl acetate is gradually warmed to the polymerization temperature. Of the Homogenization period is followed by a polymerization period, during which the catalyst, which is off a main catalyst or initiator, and may contain an activator, added in partial amounts will. Similarly, the N-methylolacrylamide is added in portions. Meanwhile, will the pressure in the system is kept largely constant by applying a constant pressure of ethylene.

Various catalysts which form free radicals, such as, for example, peroxide compounds, can be used to carry out the polymerization of the monomers. Combined catalysts which contain both reducing agents and oxidizing agents can also be used. The use of this type of combined catalyst is generally referred to in the industry as "redox polymerization" or "redox system." The reducing agent is often referred to as the activator and the oxidizing agent as the initiator. Suitable reducing agents or activators include bisulfites, sulfoxylates and others Compounds with reducing properties, such as ferrous salts and tertiary aromatic amines, e.g. B. Ν, Ν-dimethylaniline. The oxidizing agents or initiators include substances such as hydrogen peroxide, organic peroxides such as benzoyl peroxide, t-butyl hydroperoxide and the like, persulfates such as ammonium or potassium persulfate, perborates, and the like. Specific combined catalysts which are useful include hydrogen peroxide and zinc formaldehyde sulfoxylate; Hydrogen peroxide, ammonium persulfate or potassium persulfate with sodium metabisulfite, sodium bisulfite ferrous sulfate dimethylaniline, zinc formaldehyde sulfoxylate or sodium formaldehyde sulfoxylate. Other types of catalysts well known in the industry can also be used to polymerize the monomers, e.g. B. peroxide compounds with or without the addition of reducing agents or other activators. It is advantageous to use more water-soluble peroxides, such as hydrogen peroxide, in the redox system, in contrast to the more oil-soluble peroxides, such as t-butyl hydroperoxide, in order to catalyze the monomer polymerization. Redox catalyst systems are described, for example, in "Fundamental Principles of Polymerization" by GF D'Alelio (New York, 1952) on p. 333 and continuously. Other types of catalysts well known in the industry can also be used to polymerize the monomers required for the interpolymers of the invention, with or without the addition of reducing agents or other activators.
The catalyst is used in amounts of 0.1 to 2%, preferably 0.25 to 0.75%, based on the weight of the vinyl acetate introduced into the system. The activator is usually added in an aqueous solution and its amount is generally 0.25 to 1 times the amount of the catalyst.

The emulsifiers suitable for use are non-ionic.

The polyoxyethylene condensation products are among the suitable, nonionic emulsifiers. Polyoxyethylene condensation products can be given by the general formula "

R (CH ₂ -CH ₂ -O) _n H.

where R is the residue of a fatty alcohol having 10 to 18 carbon atoms, an alkylphenol, a fatty acid having 10 to 18 carbon atoms, an amide, an amine or a mercaptan, and η is an integer equal to or greater than 1. Some specific examples of polyoxyethylene Condensation products which can be used include polyoxyethylene condensation products of aliphatic ethers such as polyoxyethylene lauryl ether, polyoxyethylene oleyl ether, polyoxyethylene hydroabietyl ether, and the like; Polyoxyethylene alkylaryl ether, such as polyoxyethylene nonylphenyl ether, polyoxy

ethylene octylphenyl ether and the like; Polyoxyethylene ester higher fatty acids, such as polyoxyethylene laurate, polyoxyethylene oleate and the like, as well as condensates of Ethylene oxide with resin acids and tall oil acids; Polyoxyethylene amides and amines, such as N-polyoxyethylene lauramide and N-lauryl-N-polyoxyethylene amine and the like; and polyoxyethylene thioethers such as polyoxyethylene dodecyl thioethers.

Further nonionic emulsifiers which can be used in the polymerization are surface-active substances of the general formula

HO (C ₂ H ₄ OUC ₃ H ₆ OUC ₂ H ₄ O) ₀ H

where a, b and c are integers equal to or greater than 1. With increasing b , the compounds, if a and c remain essentially constant, become less water-soluble and more oil-soluble and thus more hydrophobic.

Furthermore, a number of ethylene oxide adducts of glycols with triple bonds are very suitable. These Compound class can be given by the formula

R ₁ -CC ^ CCR ₄

(HI)

H (OCH ₂ CH ₂ LO

0 (CH ₂ CH ₂ O) _x H

in which Rt and R4 are alkyl radicals with 3 to 10 carbon atoms, R2 and R3 are either methyl or ethyl groups and the sum of λ- and y 'is in the range from 3 to 60 inclusive

Some examples of non-ionic emulsifiers that can be used are listed below:

A Polyoxyäthylennonylphenyläther having a cloud point 52-56 ° C, a Polyoxyäthylennonylphenyläther having a cloud point above 10O ⁰ C or a similar Polyoxyäthylennonylphenyläther having a cloud point of about 30 ⁰ C; a Polyoxyäthylenoctylphenyläther having a cloud point 27-71 ° C, a Polyoxyäthylenoleyläther having a cloud point from 27 to 71 ° C and a Polyoxyäthylenlauryläther having a cloud point above 88 ⁰ C; a polyoxypropylene having a cloud point of about 6O ⁰ C and a polyoxypropylene having a cloud point of about 100 ⁰ C; a polyoxyethylene-polyoxypropylene-glycol according to the above general formula (II), in which the polyoxypropylene chain has a molecular weight of 1500 to 1800 and the polyoxyethylene content makes up between 40 and 50% of the total weight of the molecule, a polyoxyethylene-polyoxypropylene-glycol, according to of the above general formula (II), in which the polyoxypropylene chain has a molecular weight of 1500 to 1800 and the polyoxyethylene content makes up between 80 and 90% of the total weight of the molecule. Base obtained, and the hydrophobic-hydrophilic nature of the resulting compound is adjusted by varying the molecular weight of the hydrophobic base or the hydrophilic part of the molecule

For compounds of the general formula (III) typical are an ethylene oxide adduct of 2, 4, 7, 9-tetramethyl decynediol with an average of 10 moles of ethylene oxide per mole (cloud point of about 63 ° C) and a similar compound, which in the medium containing 30 moles of ethylene oxide per mole of (turbidity point above 100 ⁰ C)

The above-mentioned cloud points relate to 1% strength aqueous solutions. A single emulsifier can be used or the emulsifiers can be used in combination. If combinations of emulsifiers are used, it is advantageous to use a relatively hydrophobic emulsifier in combination with a relatively hydrophilic one. A relatively hydrophobic agent is one having a cloud point of l% aqueous solution below 88 ⁰ C and a relatively hydrophilic agent is one having a cloud point of l% solution of 88 ° C and above.

The concentration range of the total amount of emulsifiers is expediently between 0.5 and 5%, calculated on the aqueous phase of the latex, regardless of the solids content. Farther latex stabilizers are also used with success. The choice of the applicable stabilizers is directed partly according to the use to which the copolymer latex is to be added and / or the Particle size of the copolymer. The vinyl acetate-ethylene copolymer latices, which are produced by the process described can have different ranges of mean particle size to have. If the latices are to have a small mean particle size, e.g. B. below 0.25 μίτι what in of the present invention is preferred, then advantageously a monounsaturated stabilizer is used Acid with up to 6 carbon atoms used Typical acids of this type are acrylic acid, Methacrylic acid, itaconic acid, maleic acid, vinyl sulfonic acid and the like Latices increased stability They tend to copolymerize with the monomers of the system. The applicable The amount of unsaturated acids is expediently 0.1 to 3%, calculated on the Vinyl acetate, preferably 0.2 to 1%.

If, on the other hand, the latex has a particle size of over 0.25 μm, it can be used as a stabilizer in the polymerization mixture a protective colloid can be used, although an unsaturated acid may also be used if desired can be used. Different amounts of colloids can be added to the latices if desired be incorporated. However, it is better to keep the colloid concentration as low as possible. The amount of colloid to use also depends on the particular colloid itself. Colloids with higher molecular weights tend to form a latex of higher viscosity than equal amounts of one Lower Molecular Weight Colloids In addition to molecular weight, there are also other influencing factors Properties of the colloids, the viscosity of the latices and the properties of the films formed from them. It is advantageous, the colloid content of the latices to about 0.05 to 2 percent by weight based on the

Total latex. Hydroxyethyl cellulose is particularly useful as a protective colloid in latices suitable.

In addition, various other colloids can be used, e.g. B. polyvinyl alcohol, partially acetylated polyvinyl alcohol, up to 50% acetylated casein, hydroxyethyl starch, carboxymethyl cellulose, gum arabic and others known in synthetic polymer latices technology.

In order to keep the pH of the system at the desired level, a suitable one is expediently used alkaline buffer added However, any alkaline material that interacts with the stabilizer can be used as a buffer. The amount of buffer is to be calculated so that the pH value The system falls within the desired range. Ammonium and sodium bicarbonate are there because of them System compatibility and low cost are the preferred buffers. The amount of the buffer

5ο is generally 0.1 to 0.5 percent by weight, based on the monomers. However, other buffers such as disodium phosphate, sodium acetate and the like can also be used to be used.

It is one of the achievements of the process described above that latices of relatively high Solids contents can be produced directly. Accordingly, the products are in the as-manufactured state Solids contents from 45 to 60%. Of course you can

easily by adding water to the solid body can be diluted to any desired height.

Lower reaction temperatures than were previously possible for economic reasons can also be used. be applied.

It has been found that the use of lower reaction temperatures vinyl acetate copolymers of higher molecular weight results in the reaction temperature can be controlled by the rate of catalyst addition and the size _{of] 0} heat dissipation. In general, we have found that it is advantageous to maintain a mean temperature of about 50 ⁰ C during the polymerization of the monomers and to avoid temperatures significantly above 80 ° C. Although temperatures can be used down to 0 ⁰ C, the economic lower temperature limit is about 3O ⁰ C.

The reaction time also depends on other variables such as the temperature, the catalyst and the desired degree of polymerization. It is generally desirable to continue the reaction to less than 0.5% of the vinyl acetate and N-methylol acrylamide remain unimplemented. Under these circumstances, a response time of 6 hours has proven to be Proven enough to produce a complete response. However, there are reaction times between 3 and 10 hours have been used, and other reaction times can optionally be used will.

To carry out the polymerization, a larger amount of the vinyl acetate is initially added to the Brought polymerization vessel and saturated in the manner described above with ethylene Am it is best to add at least about 75% of the vinyl acetate to be polymerized initially, preferably at least about 85%, while the remainder of the vinyl acetate is in portions in the course of the polymerization is admitted. It is also planned to add all of the vinyl acetate at the beginning and then add to the to dispense with additional portion-wise addition. If a portionwise addition is mentioned, be it in relation on vinyl acetate, N-methylolacrylamide, the Catalyst or activator, additions are always uniform, both in terms of amount and amount meant the time

The amount of ethylene which enters the copolymer is influenced by the pressure, turbulence and viscosity of the polymerization liquid.Therefore, higher pressures are used to increase the ethylene content of the copolymer.But even for the introduction of 40% ethylene into the copolymer, pressures are above 100 atm not required. However, it is desirable to use a pressure of at least about 10 atm. Likewise, if the high ethylene contents are desired, a high degree of mixing should be used, high viscosities should be avoided and low viscosities should be aimed for. When viscosities are mentioned, as are those of 30 to 150 cps as low to consider such 151-800 cP as medium and those ^ ₀ 801-3000 cP as high.

The process for preparing the vinyl acetate-ethylene-N-methylolacrylamide Mischpolymerlatices provides in general the preparation of an aqueous solution before, which contains at least a portion of the emulsifier and ^ ₅ stabilizer and the pH buffering system, This aqueous solution and the initial charge of the Vinyl acetate is placed in the polymerization vessel and placed under ethylene pressure up to the desired level generally about 15 minutes. However, a shorter time may be required depending on the vessel, the effectiveness of the mixing, the specific system, and the like

By measuring the pressure drop of the ethylene by known methods, the setting of the equilibrium can always be easily determined. Appropriately, the batch is on during the stirring time Bring the polymerization temperature. Mixing can be achieved by shaking using a stirrer or by other known methods. The polymerization is then carried out by introducing a Initial amount of catalyst and activator, if used, introduced when the Polymerization has started, the catalyst and the activator, to the extent that it does Requires continuation of the polymerization, added in portions, as well as the N-methylolacrylamide and any remaining vinyl acetate

The reaction, as already mentioned, is general continued until the residual content of vinyl acetate and N-methylolacrylamide is below 0.5% lie. The finished reaction product is then allowed to reach approximately room temperature with the exclusion of the atmosphere cooling down. The pH is then adjusted to 4.5 to 7, preferably 6 to 6.5. maximum To achieve stability.

The particle size of the latex can be determined by the amount of non-ionic emulsifier or emulsifiers, and regulated by the use or not of a colloidal stabilizer. So To achieve smaller particle sizes, larger amounts of emulsifier and not colloidal ones are used Stabilizers used In order to achieve mean particle sizes below about 0.25 μm, for example, should the total amount of the non-ionogenic emulsifier, based on the aqueous phase of the latex, at least 2% and no colloidal stabilizer is used, or if a colloidal stabilizer is used, only very small amounts of it should be used.

On the other hand, if particle sizes of 0.25 μm and above that are desired, then a total of at most 2% emulsifier, based on the aqueous Phase of the latex, used and a colloidal stabilizer used in the amounts indicated above will. It is a general rule that the smaller the mean particle size, the larger the size Amount of emulsifier used and the greater the amount of colloidal used in the latex system Stabilizer is the opposite, the larger the amount of emulsifier used and the smaller the amount of the colloidal stabilizer up to and including its complete absence, the lower the average Particle size. In any case, it should be expressly understood that the abovementioned quantity and Size values are in the range of the values that have already been specified previously.

If one follows the procedure described above, in particular by adding the polymerization mixture saturated with ethylene before initiation of the polymerization, then one can use the above-described stable Vinyl acetate-ethylene-N-methylolacrylamide mixed poly-

609 511/397

Produce merlatices, which have an ethylene content of 5 to 40% in the copolymer, an inherent viscosity of 1 to 2.5 dl / g and an average particle size of 0.1 to 2 μπι and the high solids content of Have 60% and more in latex.

The ethylene content can be determined with the help of the saponification number to be determined.

The inherent viscosity is best determined by conventional methods, e.g. B. that which is communicated on pp. 309 to 314 in the book "Principles of Polymer Chemistry" ίο by Paul J. Flory (Cornell University Press - 1963), using an Ubbelohde viscometer with a hanging level at 30 ^° C .

The vinyl acetate described above

Ethylene-N-methylolacrylamide copolymer latex can be used to produce a one-sided layer finish or similar coating which the fabric, e.g. B., an upholstery fabric, feel, body, and pliable drape, or similar desirable properties confers, easily by conventional coating methods applied in woven textile technology can be applied to a woven fabric. It is used to apply the latex to the woven fabric the so-called roller applicator, in which a trough contains the latex to be applied and the one with it equipped with a rotating roller, which is partially immersed in the latex, particularly suitable The fabric to be coated is placed over the top of the roller, which is above the latex level in the trough, but carries a film of the latex which is transferred to the woven fabric in a conventional manner The usual spray devices can also be used, or any other can be used for the latex suitable method can be applied.

The latex desirably has as long as it is located in the trough of the applicator apparatus and is applied to the tissue, a temperature of the order of 49 to 6O ⁰ C. The application rate can be regulated in a simple manner by known methods and will depend on individual conditions and the specific fabric to be treated. Usually, when used as a backing coating, the latex is applied in an amount such that the solids content of the coating is on the order of 5 to 6% based on the weight of the fabric. The solids content of the latex itself can also vary, but it is generally advantageous to use a solids content of the order of 50%. If the latex has a higher solids content as it is manufactured or an even lower solids content is desired, this can easily be achieved by suitable dilution of the latex with water.

After the coating has been applied, the fabric is subjected to a drying and a vulcanization process subjected. The drying process is usually carried out at a temperature in the range from 116 to 121 ° C a period of 2 minutes, the vulcanization process at a temperature in the vicinity of 149 to 154 ° C carried out for a duration of 3 minutes. However, there may be other time-temperature combinations that state of the art, with shorter times at higher temperatures or longer times at lower temperatures. The vulcanization process can z. B. be carried out at 138 ° C for a time of 15 minutes or more. Economic considerations make .but the use of excessively long periods undesirable, and the upper temperature limit is the nature of the tissue sets temperatures which lead to tissue damage of course avoided. However, if the fabric is heat resistant, temperatures can go up to 177 ° C or above can be applied at times of 5 to 10 minutes or more. Optionally, the drying operation together with the vulcanization operation in a single operation, ζ. B. at 149 ° C in 5 to 10 Minutes to run. The N-methylolacrylamide terminates during the vulcanization process its polymerization and crosslinked in the resin. To facilitate this post-polymerization, the Latex, before it is applied to the fabric, an addition of one suitable for the N-methylolacrylamide Catalyst. Acid catalysts such as mineral acids, e.g. B. HCl, or organic acids, e.g. B. Oxalic acid, or acid salts, such as ammonium chloride, expediently, as known in the industry, The amount of catalyst used is generally about 0.5 to 2% of the total resin.

Woven fabrics coated with the resinous latex described above show those given desirable properties and retain them because of the polymer layer deposited from the latex multiple treatment with water or chemical cleaning agents, e.g. B. chlorinated hydrocarbons, he wears

The following example is given to illustrate the present invention. In the example are all parts are parts by weight, unless otherwise specified

example

The following materials were placed in a 95 liter pressure reaction vessel Made of stainless steel with temperature control device and agitator:

36,000 grams of vinyl acetate
33,000 g of water

2 210g polyoxyethylene nonylphenyl ether (cloud point about 30 ° C)

775 g polyoxyethylene nonylphenyl ether (cloud point 52 to 56 ° C)
5 g ferro-ammonium sulfate (1% solution)
5 g sodium lauryl sulfate

After purging with nitrogen and ethylene the mixture were added 104 g of potassium persulfate was added the agitator was set at 300 rpm, and the vessel under ethylene pressure of 40 atm set after attainment of equilibrium and heating to 50 ⁰ C, the stirring speed at 195 rpm was lowered and the polymerization Addition of 20 cm ^{3 of} a 0.5% solution of sodium sulfoxylate-formaldehyde (NaHSO? CH2O. 2 H2O) initiated During the polymerization, 2400 g of a 60% aqueous solution of N-methylolacrylamide were added in portions, in addition to 136 g of potassium persulfate , which was also added in portions as required. The polymerization was complete in 4½ hours. The latex was cooled and truncated to pH 5 with ammonia. The latex had the following properties:

Solids content 43.2%
Ethylene in copolymer 17%

7l35 = + TC

Ta, = + 10 ⁰ C

Intrinsic viscosity = 0.49 (methanol, 30 ° C)

Particle size = 0.2 μm

With this identification of the mixed polymer, Tbs is, according to the determination method ASTM-D-1043-61 D, the temperature at which the torsional modulus is 9490 kg / cm ² and Ta is the temperature at which the torsional modulus is 703 kg / cm ²

The latex described above was diluted to 10% solids content, 2.5% ammonium chloride (based on the solids weight) was added and the latex was applied to an 80 χ 80 printed cotton fabric. The latex was in an amount of approximately 18% (solids), based on the weight of the fabric, applied. The fabric was then dried and vulcanized on a pin tenter at 149 ° C for 6 minutes.
The vulcanized fabric was then after

Standard Test Method 61-1962 on pages B-76 and B-77 of the 1962 Technical Manual of the American Association of Textile Chemists and Colorists is, an abbreviated washing test of 1 hour at a temperature of 71 ° C in an AATCC Launder-Ometer subjected, the sample in a stainless steel cylinder containing 100 stainless steel balls Steel and the washing solution contained was tumbled. After the washing process it turns out that the Fabric was completely intact.

For comparison, this specified method was used for the production of a finished fabric repeated with the modification that the coating which was used was made of a vinyl acetate homopolymer latex with a solids content of 48.7 and a pH of 6 to 6.5 in the initial state, existed. At the end of the wash test only part of the coating remained on the fabric and the fabric failed the test passed.

Claims (5)

Patent claims: 1. Coating latex for woven fabrics, consisting of the aqueous latex of a copolymer , from vinyl acetate, ethylene and another comonomer, characterized in that it is a copolymer of vinyl acetate, ethylene and N-methylolacrylamide as a copolymer, wherein the ethylene content of the copolymer is 5 to 40% and the N-methylolacrylamide 0.5 to 10%, based on the vinyl acetate, is colloidally suspended 2. Latex according to claim 1, characterized in that the ethylene content of the copolymer 16 to 40% 3. Latex according to claim 1 or 2, characterized in that the size of the copolymer particles 0.1 to 2 μm, in particular 0.1 to 0.25 μm, amounts to 4. A latex according to claims 1 to 3, characterized in that the copolymer has an inherent viscosity of 1 to 2.5 dl / g, measured at 30 ⁰ C, has 5. Use of the latex according to claims 1 to 4 for coating woven fabrics, optionally with the use of a suitable one for the reaction of the N-methylolacrylamide component Catalyst and final curing of the coating.