Patent ID: 7649073

Claim:
A polycarbonate copolymer, comprising: A) a structural unit derived from a dihydroxy alkylene oxide compound selected from the group consisting of formula (1a) and formula (1b): H-(E-X) l —OH (1a) H-(E-X-E) l -OH (1b) wherein E and X are different and each and independently are selected from the group consisting of formula (2a) and formula (2b): —(OCH 2 CH 2 ) m — (2a) —(OCHRCH 2 ) n — (2b) wherein R is a C 1 -C 8 alkyl group; l, m, and n are integers greater than or equal to 1; and B) a structural unit derived from a high-heat monomer comprising a dihydroxy aromatic compound of formula (7): wherein R a′ and R b′ are each independently C 1-12 alkyl, T is a C 5-16 cylcloalkylidene or C 6-16 heterocycloarylene having up to three heteroatoms in the ring, wherein T is connected to at least one atom of each aromatic ring in the dihydroxy aromatic compound, wherein the heteroatoms include —O—, —S—, or N(Z)-, and Z is hydrogen, halogen, hydroxy, C 1-12 alkyl, C 1-12 alkoxy, C 6-12 aryl, or C 1-12 acyl, and wherein r and s are each independently 0 to 4, wherein an article with a thickness of 3.2 mm and molded from the polycarbonate copolymer has a haze of less than or equal to 5% according to ASTM D1003-00.