Patent ID: 6652597
Filing Date: 2003-11-25
Classification: C14C

Abstract:
A method, comprising:self-tanning, pretanning and cotanning leather pelts and fur pelts and retanning leather by applying N-vinyl-containing polymers prepared by free-radically initiated polymerization of a monomer or monomer mixture of (A) from 5 to 100% by weight of an N-vinylamide of formula I: â€ƒand/or of an N-vinylamine of formula II H2C&boxH;CHâ€”NHâ€”R2â€ƒâ€ƒ(II) where R1 and R2 are independently hydrogen or C1-C6-alkyl, (B) from 5 to 95% by weight of monoethylenically unsaturated carboxylic acids having from 3 to 8 carbon atoms, their alkali metal, alkaline earth metal or ammonium salts, anhydrides, esters, amides and/or nitriles, (C) from 0 to 95% by weight of other N-vinyl and/or C-vinyl compounds selected from the group consisting of N-vinylpyrrolidone, N-vinylcaprolactam, N-vinylimidazole, N-vinyl-2-methylimidazole, N-vinyl-4-methylimidazole, N,N-diallylammonium chloride, vinyl acetate, vinyl propionate, styrene and methylstyrenes, and (D) from 0.1 to less than 10% by weight of other copolymerizable monomers selected from the group consisting of acrylamidoglycolic acid, vinylsulfonic acid, allylsulfonic acid, methallylsulfonic acid, styrenesulfonic acid, 3-sulfopropyl acrylate, 3-sulfopropyl methacrylate, acrylamidomethylpropanesulfonic acid, vinylphosphonic acid, allylphosphonic acid and acrylamidomethanepropanephosphonic acid, wherein the proportions of said monomers (A) to (D) add up to 100% by weight of the product of the polymerization reaction and the N-acyl groups derived from said N-vinylamides I are partially or completely removable from the resulting polymers by hydrolytic detachment using acids or bases, in the form of aqueous solutions or dispersions to said leather pelts, fur pelts, leather or fur.