THERMOPLASTIC COPOLYMERS OF POLYSILOXANE POLYCARBONATE AND POLYESTER TITUENTS

摘要

THERMOPLASTIC COPOLYMERS OF POLYSILOXANE POLYCARBONATE AND POLYESTER CONSTITUENTS Inventor: Dean G. Laurin There is disclosed thermoplastic silicone copolymers having polyarylacarbonate and polyarylester constituents covalently bound to a polydiorganosiloxane constituent. The copolymer is produced by reacting a dihydric phenol with a difunctional polydiorgano siloxane, an organo-diacid halide or with alkyl or aryl ester of an organo-diacid, with phosgene or other suitable carbonate precursors. The reactions are carried out in suitable organic solvents that solubilize the reagents and the resultant copolumer, in the presence of conventional catalysts. In another embodiment a solvent system is eliminated and the condensation polymerization is carried out in a molten system.