Patent ID: 7199194
Filing Date: 2007-04-03
Classification: C08G,C09D,Y10T

Abstract:
1. A solvent borne coating composition comprising: (a) a binder component, which comprises a highly branched copolyester polyol having a number average molecular weight ranging from 1000 to 30.000, hydroxyl groups ranging from 5 to 200 per polymer chains and carboxyl groups ranging from 0 to 40 per polymer chain, said copolyaster polyol being polymerized from a monomer mixture containing a chain extender selected from the group consisting of a hydroxy carboxylic acid, a lactone of a hydroxy carboxytic acid and a combination thereof; and one or more hyper branching monomers, said hyper branching monomer having one carboxyl group and two hydroxyl groups, two carboxyl groups and one hydroxyl group, one carboxyl group and three hydroxyl groups, or three carboxyl groups and one hydroxyl group, and wherein the weight ratio of the hyper branching monomer to the chain extender in said monomer mixture ranges from 1/0.3 to 1/20; and (b) a crosslinking component selected from the group consisting of a polyisocyanate having at least two reactive isocyanate groups, a melamine and a combination thereof.