Patent ID: 8466249

Claim:
A silicone polycarbonate elastomeric block copolymer prepared by the reaction of: 60 to 70 weight percent of at least one difunctional phenolic terminated polydiorganosiloxane having from 30 to 50 organosiloxane repeat units, 30 to 40 weight percent of at least one bisphenol containing from 6 to 36 carbon atoms, and a carbonate precursor; wherein less than 10% of the carbonate linkages formed by the carbonate precursor are between phenolic terminated polydiorganosiloxanes as determined by 13 C NMR; and wherein the block copolymer has at least 30% elongation before yield as measured by ASTM D638; a % T of 70% or greater, and a haze level of 10% or less, when measured at 1.0 mm thickness according to ASTM D1003; a yellowness index of 10 or less, when measured according to ASTM D6290; and a Shore D hardness of from 5 to 20 as measured by ASTM D2240.