Patent ID: 7528212

Claim:
A thermoplastic composition comprising: a polycarbonate that is not aryl carboxylate end-capped, and an aryl carboxylate end-capped polycarbonate of formula: Ar 1 —C(O)—O-(-L-) m -O—C(O)—Ar 1 wherein each Ar 1 is independently an aryl group, -(-L-) m - is a polycarbonate linking group with m units of linking unit L, wherein L consists essentially of carbonate units wherein m is at least one, or a combination of carbonate units with poly(arylene ether) units, soft block units, or a combination comprising at least one of these, wherein m is 2 to 500 and at least one L is a carbonate unit; wherein the aryl carboxylate end-capped polycarbonate has aryl carboxylate end groups present in the thermoplastic composition in an amount of 0.01 to 500 mmol/Kg based on the combined weights of the polycarbonate that is not aryl carboxylate end-capped, and the aryl carboxylate end-capped polycarbonate, and wherein a molded article having a thickness of 3.2±0.12 millimeters and consisting of the aryl carboxylate end-capped polycarbonate, the polycarbonate that is not aryl carboxylate end-capped, and less than or equal to 1.0 percent total weight of aliphatic diol, a mold-release agent, and an antioxidant has, after exposure to a total gamma radiation dose of 81 kGy and when measured according to ASTM D1925-70, an increase in yellowness index (dYI) of less than or equal to 24.5, when compared to the unexposed molded article.