Aqueous copolymer thickener compositions

摘要

An aqueous dispersion of copolymeric microparticles, useful as an associative thickener in coating compositions such as paints, comprising copolymerised ethylenically unsaturated monomers by weight of; i) from 10 to 90 % carboxyl functional monomer; ii) from 1 to 50 % long chain alkyl ester of acrylate or methacrylate monomer where the alkyl chain contains at least 11 carbon atoms; iii) from 0 to 89 % short chain acrylate or methacrylate monomer selected from methyl acrylate, ethyl acrylate, methyl methacrylate and ethyl methacrylate and; iv) optionally other ethylenically unsaturated monomers; wherein the microparticles of the dispersion are substantially of uniform copolymer composition and the volatile organic solvent is from 0 to 1 % by weight (based on the total weight of the dispersion).