Patent ID: 7491788

Claim:
A melt-blended composition formed from, based on the total weight of the melt-blended composition, 0 to 20 wt % of an additive; and to 100 wt % of a polymer composition, wherein the polymer composition comprises, based on the total weight of the polymer composition, 5 to 95 wt % of a high Tg copolycarbonate of formula (1) wherein the mole ratio of x:y is 35:65 to 90:10, R 1 is derived from a dihydroxy compound of formula (2) wherein R 3 and R 5 are each independently a halogen or a C 1-6 alkyl group, R 4 is a C 1-6 alkyl, phenyl, or phenyl substituted with up to five halogens or C 1-6 alkyl groups, and each c is independently 0 to 4; R 2 is derived from a dihydroxy compound of formula (6): wherein R a and R b are each independently a halogen atom or a monovalent C 1-6 alkyl group; p and q are each independently integers of 0 to 4; and X a is methylene, cyclohexylmethylene, 2-[2.2.1]-bicycloheptylidene, ethylidene, isopropylidene, neopentylidene, cyclohexylidene, or cyclopentadecylidene; and wherein the high Tg copolycarbonate has a Tg of 200° C. or more; and 95 to 5 wt % of a polycarbonate of formula (9) wherein R 9 is derived from a dihydroxy compound of formula (6) wherein R a and R b are each independently a halogen atom or a monovalent C 1-6 alkyl group; p and q are each independently integers of 0 to 4; and X a is methylene, cyclohexylmethylene, 2-[2.2.1]-bicycloheptylidene, ethylidene, isopropylidene, neopentylidene, cyclohexylidene, or cyclopentadecylidene; and wherein the polycarbonate of formula (9) has a glass transition temperature of less than 200° C.; and 0.001 to 0.1 wt % of a transesterification catalyst.