Patent ID: 7632570
Filing Date: 2009-12-15
Classification: C08F,C08G,C09D,Y10T

Abstract:
1. An aqueous resinous binder comprising: (a) polymeric microparticles obtained by aqueous phase addition polymerization of a monomer component comprising one or more addition polymerizable ethylenically unsaturated monomers in the presence of a polymer dispersed in aqueous medium in which the polymer is selected from a polyester, a polyurethane and an acrylic copolymer including mixtures thereof, (b) a water-dilutable urethane polyol, (c) a hydroxyl group-containing material derived from the reaction of an epoxy group-containing material with a phosphorus acid; and (d) an aqueous dispersion of a reaction product, said reaction product produced by the steps of: reacting trimellitic anhydride and a polyol to form an intermediate reaction product, wherein the molar ratio of trimellitic anhydride to the polyol is from 1:2 to 1:4; and reacting the intermediate reaction product with an anhydride to form said reaction product.