High glass transition temperature copolycarbonates, methods of manufacture, and uses thereof

摘要

A copolycarbonate of the formula wherein 5 to 75 mole percent of the total number of R¹ groups is derived from a high Tg monomer of formula (2) wherein R² and R³ are each independently a halogen or a C_1-6 alkyl group, R⁴ is a methyl or phenyl, and c is 0 to 4; and 25 to 95 mole percent of the R¹ groups are derived from a dihydroxy compound of formula HO-R⁵-OH, wherein at least 60% of the R⁵ groups are aromatic, and the dihydroxy compound of formula (3) is not the same as the high Tg monomer of formula (2), and wherein the copolycarbonate comprises at least 10% fewer carbonate linkages of formula (4) than would be theoretically obtained in a random copolymer made from the same ratio of the high Tg monomer of formula (2) and the dihydroxy compound of formula (3).