US Patent 7649073 Polycarbonate-poly(alkylene oxide) copolymer compositions and articles formed therefrom

Disclosed herein is a polycarbonate copolymer comprising A) a structure 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):—(OCH2CH2)m—  (2a)—(OCHRCH2)n—  (2b)wherein R is a C1-8 alkyl group; l, m, and n are integers greater than or equal to 1; and wherein the weight average molecular weight of the total amount of the structures corresponding to formula (2b) in the copolymer is between 100 and 2,000 g/mol; and B) a structure derived from a dihydroxy aromatic compound, wherein the weight percentages are based on the total weight of the structures of A) and B).