Patent ID: 6350826
Filing Date: 2002-02-26
Classification: C08F,C08G,C08L

Abstract:
A curable thermoset resin composition which contains a homogeneous mixture of:(a) an epoxy vinyl ester resin; (b) a urethane vinyl ester resin having a weight average molecular weight of greater than 8,000 which forms a dispersed second phase in the epoxy vinyl ester resin upon curing of the curable formulation; and (c) optionally a co-reactive monomer, characterized in that the urethane vinyl ester resin is preparable by reacting: (1) an alkylene bis(phenyl isocyanate) compound; (2) at least two polyalkylene glycols having different molecular weights, including a first polyalkylene glycol with an average molecular weight of from about 1,500 to about 10,000 wherein the amount of the first polyalkylene glycol is from about 1.45 to about 12.6 weight percent based on the curable resin composition; and a second polyalkylene glycol with an average molecular weight of from about 200 to about 800 wherein the amount of the second polyalkylene glycol is from about 0.15 to about 3.75 weight percent, based on the curable resin composition; and, optionally a branched-polyalkylene polyol with a hydroxy functionality of greater than 2 and an average molecular weight of from about 450 to about 4600; and (3) a hydroxyalkylacrylate or hydroxyalkyl methacrylate.