Use of aqueous solutions or dispersions of copolymers of carboxyl- group- containing monomers, ethylenically unsaturated acetals, ketals or orthocarboxylic acid esters and optionally other copolymerizable monomers as leather tanning agents

摘要

The use of aqueous solutions or dispersions of copolymers composed ofPPA) from 5 to 95 mol % of ethylenically unsaturated mono- or dicarboxylic acids having 3 to 10 carbons, their anhydrides, their alkali metal, alkaline earth metal or ammonium salts, or mixtures thereof,PPB) from 5 to 95 mol % of ethylenically unsaturated acetals, ketals or orthocarboxylic esters of the formula I ##STR1## where R.sup. 1 to R.sup.12 independently are hydrogen or an organic radical andPP a to d independently are 0 or 1, andPPC) from 0 to 70 mol % of other copolymerizable monomersPPor their hydrolysis products or polymer- analogous reaction products, as tanning agents for the self- tanning, pretanning or assist tanning of leather pelts and skin pelts or for the retanning of leather and skins.