HIGH GLASS TRANSITION TEMPERATURE COPOLYCARBONATES, METHODS OF MANUFACTURE, AND USES THEREOF

摘要

A copolycarbonate is discloses, comprising units of the formula (1) wherein 70 to 99.5 mole percent of the total number of R1 groups are derived from a dihydroxy compound of formula (2) wherein R2 and R3 are each independently a halogen or a Cj-6 alkyl group, R4 is a methyl or a phenyl group, and c is independently O to 4; and 0.5 to 30 mole percent of the total number of R1 groups are derived from a dihydroxy compound of formula (3) wherein at least 60% of the R3 groups are aromatic, and the dihydroxy compound of formula (3) is not the same as the dihydroxy compound of formula (2), and wherein the copolycarbonate has a glass transition temperature of 2500C or higher.