Patent ID: 6632880
Filing Date: 2003-10-14
Classification: C08G,C09D

Abstract:
A coating composition comprising about 40-90% by weight of film forming binder and 10-60% by weight of an organic liquid carrier; wherein the binder comprises about(a) 10-70% by weight, based on the weight of the binder, of a dispersed gelled acrylic polymer, the polymer consisting essentially of (i) a core comprising polymerized ethylenically unsaturated monomers which is not soluble in the organic liquid carrier and having chemically grafted thereto (ii) linear polymeric stabilizer components that are soluble in the organic liquid carrier comprising polymerized ethylenically unsaturated monomers and having a weight average molecular weight of about 500-20,000 determined by GPC (gel permeation chromatography) using polystyrene as the standard; wherein the core, the stabilizer polymeric component, or both contain at least 3% by weight of polymerized ethylenically unsaturated monomers having isocyanate groups attached thereto that are capable of reacting with component (b) and wherein the resultant dispersed gelled acrylic polymer is free of functional groups capable of reacting with said isocyanate groups; (b) 30-90% by weight, based on the weight of the binder, of an oligomer or polymer or both having functional components capable of reacting with the isocyanate groups of component (a); and (c) 0-60% by weight, based on the weight of the binder, of an organic polyisocyanate crosslinking agent.