Polyester polymers of 3-hydroxy-4'-(4-hydroxyphenyl) benzophenone or 3,4'-dihydroxybenzophenone and dicarboxylic acids

摘要

Aromatic polyesters derived from at least 10% glycols of the structureorare disclosed. The polyesters have an inherent viscosity of at least 0.5 as measured from a 0.5 g solution in 100 ml of an equal volume mixture of p-chlorophenol and 1,2-dichloroethane, and a heat of fusion of less than 1.5 joule per gram.