Diepoxide reacted with a half ester from a dicarboxyic acid anhydride and polyalkylene glycol

摘要

A polyester polyol having the idealized structure: <IMAGE> where R represents the residue of a polyepoxide after ring opening with a carboxylic acid group, R' represents the residue of a cyclic anhydride, n is a number of from 4 to 25, m represents the number of epoxy groups of the polyepoxide ring opened with carboxylic acid groups, and R'' represents -H or -CH3.