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

摘要

A copolycarbonate of the formula (1) wherein 5 to 75 mole percent of the total number of R<SUP>1</SUP> groups is derived from a high Tg monomer of formula (2), wherein R<SUP>2</SUP> and R<SUP>3</SUP> are each independently a halogen or a C<SUB>1-6</SUB> alkyl group, R<SUP>4</SUP> is a methyl or phenyl, and c is 0 to 4; and 25 to 95 mole percent of the R<SUP>1</SUP> groups are derived from a dihydroxy compound of formula (3) HO-R<SUP>5</SUP>-OH, wherein at least 60% of the R<SUP>5</SUP> 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).