Patent ID: 9688855
Date: 2017-06-27
CPC Classifications: C08G,C08K,C08L

Claim:
1. A polycarbonate composition comprising: 30 to 95 wt % of one or more bisphenol A polycarbonate homopolymers; and 5 to 70 wt % of a poly(carbonate-siloxane) copolymer with a siloxane content of 10 wt. % to 25 wt. % based on the total weight of the poly(carbonate-siloxane), in an amount effective to provide a total siloxane content of 0.5 wt. % to 17.5 wt. % based on the total weight of the composition; the poly(carbonate-siloxane) copolymer wherein R p and q are each independently 0 to 4, and X siloxane units of the formulas or a combination comprising at least one of the foregoing, wherein R is each independently a C Ar is each independently a C R E has an average value of 10 to 100; wherein in the poly(carbonate-siloxane) copolymer less than 0.5 mol % of the siloxane units are directly coupled to another siloxane units; and further wherein the composition has a tensile yield strength retention of 80% and higher after exposure of an ISO tensile bar for 24 hours to sunscreen under 0.5% strain compared to a non-exposed reference tested according to ISO 22088-3; and an elongation at break retention of 75% and higher after exposure of an ISO tensile bar for 24 hours to sunscreen under 0.5% strain compared to a non-exposed reference tested according to ISO 22088-3.