Patent ID: 7812089
Filing Date: 2010-10-12
Classification: C08F,C09D

Abstract:
1. An aqueous polymer dispersion comprising a copolymer of maleic anhydride monomer units and styrene monomer units, which copolymer has been subjected to an imidization reaction with NH 3 or an amine RNH 2 (wherein R is an alkyl group having 1-18 carbon atoms or an aryl group), wherein the molar ratio between NH 3 or the amine and the maleic anhydride monomer in the copolymer ranges between 1.2-0.8:1, wherein at least 95 mole % of the anhydride monomer units of the copolymer are imidized, and wherein the polymer dispersion comprises discrete particles having a particle size between approximately 30-400 nm.