Method for the production of leather, copolymers that are suitable therefor, and further uses thereof

Abstract

Process for the production of leather, wherein pelts, pickled pelts or semifinished products are treated with at least one copolymer (A) which is obtainable by copolymerization of the following comonomers: (a) at least one ethylenically unsaturated C 3 -C 10 -carboxylic acid or at least one ethylenically unsaturated C 4 -C 10 -dicarboxylic acid or its anhydride, (b) at least one (meth)acrylate of an α-branched C 3 -C 10 -alkanol, (c) at least one (meth)acrylate of a primary C 4 -C 20 -alkanol.

1 - 23 . (canceled) 
   
   
       24 . A process for the production of leather, wherein pelts, pickled pelts or semifinished products are treated with at least one copolymer (A) which is obtainable by copolymerization of the following comonomers:
 (a) at least one ethylenically unsaturated C 3 -C 10 -carboxylic acid or at least one ethylenically unsaturated C 4 -C 10 -dicarboxylic acid or its anhydride,   (b) at least one (meth)acrylate of an α-branched C 3 -C 10 -alkanol,   (c) at least one (meth)acrylate of a primary C 4 -C 20 -alkanol.   
   
   
       25 . The process according to  claim 24 , wherein at least one comonomer (b) is a (meth)acrylate of a tertiary C 4 -C 10 -alkanol. 
   
   
       26 . The process according to  claim 24 , wherein at least one comonomer (c) is a (meth)acrylate of a primary β or γ-branched C 4 -C 20 -alcohol. 
   
   
       27 . The process according to  claim 24 , wherein at least one comonomer (b) is a methacrylate of a tertiary C 4 -C 10 -alkanol and at least one comonomer (c) is an acrylate of a primary β or γ-branched C 4 -C 20 -alcohol. 
   
   
       28 . The process according to  claim 24 , wherein copolymer (A) is obtainable by copolymerization of
 a. altogether from 5 to 30% by weight of ethylenically unsaturated C 3 -C 10 -carboxylic acid or ethylenically unsaturated C 4 -C 10 -dicarboxylic acid or its anhydride,   b. altogether from 5 to 30% by weight of (meth)acrylate of α-branched C 3 -C 10 -alkanol,   c. altogether from 40 to 90% by weight of (meth)acrylate of primary C 4 -C 20 -alkanol.   
   
   
       29 . The process according to  claim 24 , wherein ethylenically unsaturated C 3 -C 10 -carboxylic acid (a) incorporated in the form of polymerized units or ethylenically unsaturated C 4 -C 10 -dicarboxylic acid (a) incorporated in the form of polymerized units is present in at least partly neutralized form. 
   
   
       30 . The process according to  claim 24 , wherein the anhydride of ethylenically unsaturated C 4 -C 10 -dicarboxylic acid (a) which is incorporated in the form of polymerized units is present in at least partly hydrolyzed and, if necessary, at least partly neutralized form. 
   
   
       31 . The process according to  claim 24 , wherein copolymer (A) is a random copolymer. 
   
   
       32 . An aqueous formulation comprising at least one copolymer which is obtainable by copolymerization of the following comonomers:
 a. at least one ethylenically unsaturated C 3 -C 10 -carboxylic acid or at least one ethylenically unsaturated C 4 -C 10 -dicarboxylic acid or its anhydride,   b. at least one (meth)acrylate of an α-branched C 3 -C 10 -alkanol,   c. at least one (meth)acrylate of a primary C 4 -C 20 -alkanol.   
   
   
       33 . A copolymer obtainable by copolymerization of the following comonomers:
 a. at least one ethylenically unsaturated C 3 -C 10 -carboxylic acid or at least one ethylenically unsaturated C 4 -C 10 -dicarboxylic acid or its anhydride,   b. at least one methacrylate of an α-branched C 3 -C 10 -alkanol,   c. at least one acrylate of a primary C 4 -C 20 -alkanol.   
   
   
       34 . The copolymer according to  claim 33 , wherein at least one comonomer (b) is a methacrylate of a tertiary C 4 -C 10 -alkanol. 
   
   
       35 . The copolymer according to  claim 33 , wherein at least one comonomer (c) is a (meth)acrylate of a primary β or γ-branched C 4 -C 20 -alcohol. 
   
   
       36 . The copolymer according to  claim 33 , which is obtainable by copolymerization of
 a. from 5 to 30% by weight of an ethylenically unsaturated C 3 -C 10 -carboxylic acid or at least one ethylenically unsaturated C 4 -C 10 -dicarboxylic acid or its anhydride,   b. from 5 to 30% by weight of a methacrylate of an α-branched C 3 -C 10 -alkanol,   c. from 40 to 90% by weight of an acrylate of a primary C 4 -C 20 -alkanol.   
   
   
       37 . The copolymer according to  claim 33 , which is a random copolymer. 
   
   
       38 . The copolymer according to  claim 33 , wherein ethylenically unsaturated C 3 -C 10 -carboxylic acid (a) incorporated in the form of polymerized units or ethylenically unsaturated C 4 -C 10 -dicarboxylic acid (a) incorporated in the form of polymerized units is present in at least partly neutralized form. 
   
   
       39 . The copolymer according to  claim 33 , wherein the anhydride of ethylenically unsaturated C 4 -C 10 -dicarboxylic acid (a) which is incorporated in the form of polymerized units is present in at least partly hydrolyzed and, if appropriate, at least partly neutralized form. 
   
   
       40 . A process for the preparation of copolymers according to  claim 33 , wherein the following are subjected to free radical polymerization with one another:
 a. at least one ethylenically unsaturated C 3 -C 10 -carboxylic acid or at least one ethylenically unsaturated C 4 -C 10 -dicarboxylic acid or its anhydride,   b. at least one methacrylate of an α-branched C 3 -C 10 -alkanol,   c. at least one acrylate of a primary C 4 -C 20 -alkanol.   
   
   
       41 . The aqueous formulation according to  claim 32 , additionally comprising at least one silicone compound (B). 
   
   
       42 . The aqueous formulation according to  claim 32 , additionally comprising at least one emulsifier (C) 
   
   
       43 . The aqueous formulation according to  claim 42 , wherein the emulsifier (C) is the phosphate of an alkoxylated alkanol.