Patent ID: 9676939
Date: 2017-06-13
CPC Classifications: C08L

Claim:
1. A polycarbonate blend composition comprising: (a) a first polycarbonate having a glass transition temperature of greater than 170° C. as measured using a differential scanning calorimetry method, wherein the first polycarbonate is derived from: wherein D comprises one or more alkyl containing C 6 -C 20 , aromatic group(s), or one or more C 6 -C 20 aromatic group(s), and T comprises a C 6 -C 20 aromatic group; and (b) a second polycarbonate wherein the second polycarbonate is a polysiloxane block copolymer derived from wherein R comprises a C 1 -C 30 aliphatic, a C 1 -C 30 aromatic group, or a combination thereof, wherein R 6 comprises C 7 -C 30 aromatic group, or a combination of a C 7 -C 30 aromatic group and a C 7 -C 30 aliphatic group, wherein E has an average value of 20-75; wherein the blend composition has a glass transition temperature (Tg) between 148° C. and 155° C. as measured using a differential scanning calorimetry method; wherein the blend composition has a percent (%) haze of less than 3.5% and a % transmission of greater than 80% as measured using a method of ASTM D 1003-07; wherein the blend composition possesses 80% or greater ductility in a notched izod test at −20° C. at a thickness of 0.125 inches according to ASTM D 256-10.