Process for the coating of textiles

Abstract

The present invention relates to a process for the production of coated textiles in which a textile substrate is firstly brought into contact with an aqueous dispersion comprising at least one inorganic salt and at least one modified cellulose.

1 . Process for the production of coated textiles, comprising at least the steps of
 a) bringing a textile substrate into contact with an aqueous dispersion A comprising at least one inorganic salt and at least one modified cellulose,   b) bringing a textile substrate into contact with an aqueous dispersion B comprising polyurethane and   c) precipitation of the polyurethane in or on the textile substrate.   
     
     
         2 . Process according to  claim 1 , where the inorganic salt is a salt selected from the group consisting of alkali metal salts and alkaline-earth metal salts. 
     
     
         3 . Process according to  claim 2 , where the alkali metal salt is a salt selected from the group consisting of alkali metal halides, alkali metal nitrates, alkali metal phosphates, alkali metal sulfates, alkali metal carbonates and alkali metal hydrogen carbonates. 
     
     
         4 . Process according to  claim 2 , where the alkaline-earth metal salt is a salt selected from the group consisting of alkaline-earth metal halides, alkaline-earth metal nitrates, alkaline-earth metal phosphates, alkaline-earth metal sulfates, alkaline-earth metal carbonates and alkaline-earth metal hydrogen carbonates. 
     
     
         5 . Process according to  claim 1 , where the inorganic salt is present in dispersion A in an amount of 0.01 to 25% by weight, based on the total amount of dispersion A. 
     
     
         6 . Process according to  claim 1 , where the modified cellulose is a compound selected from the group consisting of methylcellulose, ethylcellulose, propylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxy propylmethylcellulose, carboxymethylcellulose, carboxyethylcellulose and carboxy propylcellulose. 
     
     
         7 . Process according to  claim 1 , where the modified cellulose is present in dispersion A in an amount of 10 ppm to 5% by weight, based on the total amount of dispersion A. 
     
     
         8 . Process according to  claim 1 , characterized in that the textile substrate employed is a woven fabric, knitted fabric or nonwoven based on natural and/or synthetic fibers. 
     
     
         9 . Process according to  claim 1 , characterized in that the polyurethane is precipitated in step c) in a bath containing water or on use of a temperature in the range from 80 to 120° C. 
     
     
         10 . Coated textile obtainable by a process according to  claim 1 . 
     
     
         11 . Coated textile according to  claim 10 , characterized in that the coated textile is synthetic leather.