Patent ID: 9034977
Filing Date: 2015-05-19
Classification: C08F,C08K

Abstract:
1. A method for preparing a stable dispersion of solids comprising fillers or pigments in an aqueous medium comprising introducing a polymer product as a dispersing agent into the medium, said polymer product being obtained by polymerization of N-vinylformamide, vinyl acetate, and maleic anhydride to give a copolymer comprising N-vinylformamide, vinyl acetate and maleic anhydride followed by hydrolyzing formamide groups originating from N-vinylformamide to amino groups, acetate groups originating from vinyl acetate to hydroxyl groups and acid anhydride to dicarboxylic acid groups to give a water-soluble copolymer comprising amine, hydroxyl and carboxyl groups, wherein the molar ratio of the N-vinylformamide and vinyl acetate monomer to the maleic anhydride monomer is from 70:30 to 30:70.