A copolycarbonate of the formula ##STR00001## wherein 5 to 75 mole percent of the total number of R.sup.1 groups is derived from a high Tg monomer of formula (2) ##STR00002## wherein R.sup.2 and R.sup.3 are each independently a halogen or a C.sub.1-6 alkyl group, R.sup.4 is a methyl or phenyl, and c is 0 to 4; and 25 to 95 mole percent of the R.sup.1 groups are derived from a dihydroxy compound of formula HO--R.sup.5--OH, wherein at least 60% of the R.sup.5 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) ##STR00003## 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).