Reinforced polycarbonate compositions with improved heat resistance

A reinforced polycarbonate composition comprising

• 30-60 weight percent of a bisphenol A homopolycarbonate;
• and
• 10-40 weight percent of a high heat polycarbonate having a glass transition temperature of 170° C. or higher determined per ASTM D3418 with a 20° C./min heating rate;
• and
• 8-16 weight percent of a poly(carbonate-siloxane) and 1-10 weight percent of a phosphorous-containing flame retardant comprising a phosphazene present in amount effective to provide 0.5 to 1.5 weight percent phosphorous,
• wherein the phosphazene is a phenoxy cyclotriphosphazene, octaphenoxy cyclotetraphosphazene, decaphenoxy cyclopentaphosphazene, or a combination thereof, or the phosphazene is of formulas
• or a combination thereof, wherein
• w1 is 3-10,000,
• w2 is 3-25, and
• each Rw is independently a C1-12 alkyl, C2-12 alkenyl, C1-12 alkoxy, C6-12 aryl, C6-12 aryloxy, or polyoxy(C1-6 alkylene) group;
• and
• 0.01-0.5 weight percent of an anti-drip agent;
• and
• 5-30 weight percent of glass fibers;
• and
• optionally, up to 5 weight percent of an additive composition,
• wherein each amount is based on the total weight of the reinforced polycarbonate composition, which sums to 100 weight percent;
• and
• wherein a molded sample of the polycarbonate composition has
• a heat deflection temperature of greater than 115° C., as measured according to ISO 75 at 0.45 megapascal,
• a Vicat B120 softening temperature of at least 130° C. as measured according to ISO 306, and
• a flame test rating of V0 as measured according to UL-94 at a thickness of 0.8 millimeter.