Curing resins based on mixtures of epoxy vinyl ester and urethane vinyl ester resins

摘要

A curable resin composition including a homogeneous mixture or blend of:(a) an epoxy vinyl ester resin, and(b) a urethane vinyl ester resin having a weight average molecular weight of greater than 8000 and forming a dispersed second phase in the epoxy vinyl ester resin upon curing of the curable resin composition prepared by reacting:(i) an alkylene bis(phenyl isocyanate) compound;(ii) a plurality of polyalkylene glycols having at least a bimodal distribution of molecular weights, wherein a short-chain molecular weight peak is centered at from about 1,500 to about 10,000 and a long-chain molecular weight peak is centered at from about 200 to about 800 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(iii) a hydroxyalkyl acrylate or hydroxyalkyl methacrylate.