Patent ID: 8703855

Claim:
A composition comprising, based on the total weight of the composition: a polycarbonate that is not a polysiloxane block-co-polycarbonate; 7.5 to 25 wt % of a polysiloxane block co-polycarbonate; 5 to 15 wt % of a transition metal oxide comprising at least one of chromium dioxide and titanium dioxide; optionally a brominated organic flame retardant effective to provide 2 to 6 wt % of bromine atoms; optionally 0.1 to 0.5 wt % of a fluorinated polyolefin; optionally an additive that imparts a desired performance property; and optionally a carbon black containing material, wherein the polysiloxane block co-polycarbonate is derived from Bisphenol-A or a dihydroxy aromatic compound, and a polysiloxane bisphenol having the structure 3: wherein each R is independently a C 1 -C 30 aliphatic or an aromatic group or a combination of said aliphatic or said aromatic groups, each R 3 is independently a divalent C 2-8 aliphatic group, M is the same or different, and is a halogen, cyano, nitro, C 1-8 alkylthio, C 1-8 alkyl, C 1-8 alkoxy, C 2-8 alkenyl, C 2-8 alkenyloxy group, C 3-8 cycloalkyl, C 3-8 cycloalkoxy, C 6-10 aryl, C 6-10 aryloxy, C 7-12 arylalkyl, C 7-12 arylalkoxy, C 7-12 alkylaryl, or C 7-12 alkylaryloxy, wherein each n is independently 0, 1, 2, 3, or 4 and wherein E has an average value of 20 to 100 and wherein the composition has a notched izod impact at −30° C. of at least 35 kJ/m 2 at a thickness of 3.0 mm according to ISO-180 standard with a 5.5 J hammer and further wherein the composition does not show tracking through at least 50 drops of a 0.1% aqueous ammonium chloride at 250V according to ASTM D-3638.