Patent ID: 6022940
Filing Date: 2000-02-08
Classification: A61K,C08G

Abstract:
A copolymer composition comprising a cationic initiated reaction product of 2,3,8,9-di(tetramethylene)-1,5,7,11-tetraoxaspiro-[5,5]-undecane and a multifunctional epoxy resin comprised of an epoxy comonomer mixture of (i) diglycidyl ether of bisphenol A, (ii) 3,4-epoxycyclohexanemethyl-3,4-epoxycyclohexane carboxylate, and (iii) vinyl cyclohexene dioxide, in a ratio of approximately 5:4:1 by weight, said cationic initiated reaction product being characterized by the property of undergoing a bulk shrinkage of less than or equal to approximately .+-.1.0% during polymerization.