Patent ID: 7994254

Claim:
A composition, comprising, based on the total weight of the polymer components in the composition, 1 to 40 wt. % of an aromatic polycarbonate; 30 to 98.8 wt. % of a polysiloxane-polycarbonate block copolymer comprising carbonate units of the formula wherein at least 60 percent of the total number of R 1 groups are C 1-60 aromatic organic radicals and the balance thereof are aliphatic, alicyclic, or aromatic radicals, and polysiloxane units derived from a dihydroxy polysiloxane of the formula wherein R is independently at each occurrence the same or different C 1-13 monovalent organic group, E has an average value of 10 to 100, M can be the same or different, and can be a halogen, cyano, nitro, C 1 -C 8 alkylthio, C 1 -C 8 alkyl, C 1 -C 8 alkoxy, C 2 -C 8 alkenyl, C 2 -C 8 alkenyloxy group, C 3 -C 8 cycloalkyl, C 3 -C 8 cycloalkoxy, C 6 -C 10 aryl, C 6 -C 10 aryloxy, C 7 -C 12 aralkyl, C 7 -C 12 aralkoxy, C 7 -C 12 alkylaryl, or C 7 -C 12 alkylaryloxy, n is independently 0, 1, 2, 3, or 4, and R 6 is a divalent C 2 -C 8 aliphatic group; 0.1 to 10 wt. % of a polysiloxane-polyimide block copolymer comprising more than 20 wt. % polysiloxane units, based on the total weight of the polysiloxane-polyimide copolymer; wherein a 3.2 mm thick molded sample comprising the composition has less than or equal to 8% haze and at least 80% luminous transmittance, measured in accordance with ASTM D1003-00, and a 3.2 mm thick molded sample comprising the composition retains more than 50% of its initial notched Izod impact strength of 6 to 20 ft-lb/in at 23° C. after hydro-aging for 5 days at 100° C., measured in accordance with ASTM D256: 2004.