Siloxane poly esters carbonate block terpolymer together settling and heat-resistant polycarbonate

摘要

A thermoplastic composition which comprises a siloxane polycarbonate block copolymer wherein the polysiloxane segments of the copolymer are of the formula: or where R¹, R², Y, D, A, X, A' and E are as defined herein, and high heat polycarbonates containing recurring or repeating polycarbonate units of the formula: wherein Z is -O-, -N(R³)- or a mixture thereof and R³ is selected from hydrogen, hydrocarbyl and halogen-substituted hydrocarbyl.