POLYMER DISPERSIONS FOR THE TREATMENT OF LEATHER

摘要

Aqueous dispersions which are suitable for the treatment of leather and have a pH of from 2 to 7 and particle diameters of from 20 to 150 nm of polymers having a T.lambda.max value below 20 C of: (A) from 20 to 70 parts by weight of one or more acyclic conjugated dienes having from 4 to 9 carbon atoms; (B) from 10 to 40 parts by weight of acrylonitrile and/or methacrylonitrile; (C) From 1 to 5 parts by weight of allylsuphonic acid and/or methallyl sulphonic acid or water-soluble salts thereof: (D) From 5 to 20 parts, by weight of acrylic and/or methacrylic acid hydroxyalkyl esters having from 2 to 4 carbon atoms in the hydroxyalkyl group; and (E) 0 to 40 parts by weight of acrylic and/or methacrylic acid alkyl esters having up to 8 carbon atoms in the alkyl group.