Patent ID: 7605221

Claim:
A copolymer composition comprising: a polysiloxane block comprising siloxane units, wherein the polysiloxane block is of the formula: wherein x is 4 to 50, each R 3 is the same or different, and is C 1-8 alkyl or C 6-13 aryl; and D 1 is the reaction residue of a dihydroxy aromatic compound; or the polysiloxane block is of the formula: wherein q is 4 to 50; each R 3 is the same or different, and R 4 is a C 6-30 hydrocarbylene; and a polyarylate-polycarbonate block consisting essentially of arylate polyester units and aromatic carbonate units present in an amount of 50 to 99 mole percent of arylate polyester units, and 1 to 50 mole percent aromatic carbonate units, wherein 1 to 30 mole percent of the aromatic carbonate units are resorcinol carbonate units, and 0 to 35 mole percent of the aromatic carbonate units are bisphenol carbonate units, wherein the sum of the mole percentages of arylate polyester units and aromatic carbonate units in the arylate block is 100 mole percent, wherein the polysiloxane blocks are connected to an arylate ester unit, a aromatic carbonate unit, or both an arylate ester unit and a aromatic carbonate unit, and wherein the siloxane units of the polysiloxane block are present in an amount of 0.2 to 10 wt % based on the weight of the copolymer composition, and wherein a molded article having a thickness of 3.2±0.12 millimeters, and consisting of the copolymer composition, has a percent transmittance of greater than or equal to 70%, according to ASTM D1003-00.