Process for the coating of textiles

Abstract

A process for the production of coated textiles comprises at least the steps of a) bringing a textile substrate into contact with an aqueous dispersion A comprising at least one salt and at least one modified cellulose, b) bringing a textile substrate into contact with an aqueous dispersion B comprising at least one polymer selected from the group consisting of polyurethane, polyacrylate and polybutadiene and c) precipitation of the polyurethane in or on the textile substrate. The salt of dispersion A is an organic onium salt of one or more elements of the fifth main group of the periodic table of the elements. The invention further relates to a coated textile obtainable by a process according to the invention and to the use of organic onium salts of one or more elements of the fifth main group of the periodic table of the elements for the production of coated textiles.

Claims

1. A process for the production of a coated textile, comprising at least the steps of a) first, bringing a textile substrate into contact with an aqueous dispersion A consisting essentially of at least one salt and at least one modified cellulose, b) subsequently, bringing a textile substrate into contact with an aqueous dispersion B comprising at least one polymer selected from the group consisting of polyurethane, polyacrylate and polybutadiene, and c) precipitating the polyurethane in or on the textile substrate, wherein the salt of dispersion A is an organic onium salt of one or more elements of the fifth main group of the periodic table of the elements.

2. The process according to claim 1, wherein the salt of dispersion A is selected from the group consisting of tertiary ammonium salts, quaternary ammonium salts, tertiary phosphonium salts and quaternary phosphonium salts.

3. The process according to claim 1, wherein the salt of dispersion A is selected from the group consisting of (chloro-hydroxyalkyl)trialkylammonium salts, trialkyl[(trialkoxysilyl)alkyl]ammonium salts, trialkylalkoxyl ammonium salts, trialkylammonium epihydrinamine salts, monoammonium salts of N,N,N′,N′-tetrakis(2-hydroxyalkyl)alkylenediamine and diammonium salts of N,N,N′,N′-tetrakis(2-hydroxyalkyl)alkylenediamine.

4. The process according to claim 1, wherein the organic onium salt is present in dispersion A in an amount of ≧0.01% by weight to ≦15% by weight, based on the total amount of dispersion A.

5. The process according to claim 1, wherein the modified cellulose is a compound selected from the group consisting of methylcellulose, ethylcellulose, propylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, carboxymethylcellulose, carboxyethylcellulose and carboxypropylcellulose.

6. The process according to claim 1, wherein the modified cellulose is present in dispersion A in an amount of ≧10 ppm by weight to ≦25% by weight, based on the total amount of dispersion A.

7. The process according to claim 1, wherein the textile substrate is a woven fabric, knitted fabric or nonwoven based on natural and/or synthetic fibers.

8. The process according to claim 1, wherein the polyurethane is precipitated in step c) in a bath containing water and/or by heating to a temperature in the range from ≧80° C. to ≦180° C.

9. The process according to claim 1, further comprising the step of at least partially removing excess liquids after step a) and/or after step b).

10. A process for the production of a coated textile, consisting of the steps of a) first, bringing a textile substrate into contact with an aqueous dispersion A essentially consisting of at least one salt and at least one modified cellulose, wherein the salt is selected from the group consisting of (chloro-hydroxyalkyl)trialkylammonium salts, trialkyl[(trialkoxysilyl)alkyl]ammonium salts, trialkylalkoxyl ammonium salts, trialkylammonium epihydrinamine salts, monoammonium salts of N,N,N′,N′-tetrakis(2-hydroxyalkyl)alkylenediamine and diammonium salts of N,N,N′,N-tetrakis(2-hydroxyalkyl)alkylenediamine, a1) partially removing excess liquids, b) subsequently, bringing a textile substrate into contact with an aqueous dispersion B comprising at least one polymer selected from the group consisting of polyurethane, polyacrylate and polybutadiene, b1) partially removing excess liquids, and c) precipitating the polyurethane in or on the textile substrate.

Description

EXAMPLES

(1) TABLE-US-00001 antistatic contains N,N,N′,N′-tetrakis(2-hydroxypentyl)ethylene agent SN diamine, supplied by Jiangshu Haihua Trading Company methyl- supplied by Wolff Cellulosics GmbH & Co. KG, hydroxyethyl Germany cellulose Impranil® aqueous polyurethane dispersion supplied by LP DSB 1069 Bayer MaterialScience AG, Germany Coagulant WS supplied by Lanxess GmbH, Germany Emulvin WA supplied by Lanxess GmbH, Germany

(2) Dispersion A has the following composition:

(3) TABLE-US-00002 antistatic agent SN  80 pbw methylhydroxyethyl cellulose  1 pbw Water 919 pbw

(4) Dispersion A has a viscosity of 400 to 500 cps determined by using Brookfield Viscometer DV-II+ PRO.

(5) Dispersion B has the following composition:

(6) TABLE-US-00003 Impranil® LP DSB 1069 1000 pbw  Coagulant WS 20 pbw Emulvin WA 20 pbw

(7) Dispersion B has a viscosity of 300 to 400 cps determined by using Brookfield Viscometer DV-II+ PRO.

(8) The textile substrate was dipped into dispersion A for 10 seconds, padded with at 4 bar and dried at 100° C., for a period of 1 to 2 minutes. Subsequently, the textile substrate was dipped into dispersion B for a period of 10 to 15 seconds and padded with at 4 bar. The substrate was treated three times each treatment lasting 3 minutes with air at 80° C. and low speed. Finally, the substrate was soft tumbled.

(9) Substrates which have been subjected to the above described process without dipping into dispersion A had a very hard and stiff feel.

(10) By contrast, substrates which were treated in accordance with the invention as described above exhibited a pleasantly soft, round feel. On subsequent coating of the resultant substrates, considerable differences were likewise apparent between the substrates treated with dispersions A and B and the substrates which were only treated with dispersion B, such that the fall of the folds (folding) appeared sharp and/or blistered in the case of the untreated substrate. The substrate treated in accordance with the invention exhibited round, optically perfect folding.