Patent ID: 7671169

Claim:
A polycarbonate-polyester block copolymer, comprising: a polycarbonate block having the structure wherein each occurrence of R 1 is independently a C 6 -C 60 divalent hydrocarbon group, provided that at least 60% of the R 1 groups comprise aromatic moieties; Y is —O— or —O—R 2 —R 3 —O—; each occurrence of R 2 is independently a C 6 -C 18 arylene group; each occurrence of R 3 is independently a C 1 -C 12 alkylene group; and n is 2 to about 200; and an aliphatic polyester block having the structure wherein each occurrence of R 4 and R 5 is independently hydrogen or C 1 -C 12 alkyl; each occurrence of p is independently 0, 1, 2, 3, 4, or 5; and q is 2 to about 1,000; wherein the polycarbonate-polyester block copolymer comprises a C 6 -C 18 aryl end group or an end group having the structure