Polycarbonate composition, method for the manufacture thereof, and articles formed therefrom

A polycarbonate composition comprising:

• 10 to 99 weight percent, based on the total weight of the polycarbonate composition, of a bisphenol A polycarbonate homopolymer;
• a polycarbonate-siloxane copolymer having a siloxane content of greater than 30 to 70 weight percent, based on the total weight of the polycarbonate-siloxane copolymer;
• wherein the polycarbonate-siloxane copolymer is present in an amount to provide a total siloxane content of 0.5 to 20 weight percent, based on the total weight of the polycarbonate composition;
• 15 to 45 weight percent of a poly(ester-carbonate);
• and
• optionally, 0.5 to 6 weight percent, based on the total weight of the polycarbonate composition, of an organophosphorus flame retardant;
• wherein a molded sample of the composition exhibits:
• a tensile elongation retention of at least 80% after exposure to DOT 4 or DOT 5.1 brake fluid for 72 hours at a temperature of 23° C. under 0% strain compared to non-exposed reference sample of the same composition;
• and
• an Izod notched impact strength of greater than 650 kilojoules per meter at a temperature of 23° C., as determined according to ASTM D256-10;
• and
• optionally, an Izod notched impact strength of greater than 400 kilojoules per meter at a temperature of −30° C., as determined according to ASTM D256-10.