Method of preparing transparent silicone-containing copolycarbonates

摘要

Silicone-containing copolycarbonates possessing relatively long siloxane chains and yet having low haze values and hence transparency are prepared by reacting a siloxane bischloroformate with a hydroxy-terminated polycarbonate oligomer to afford a silicone-containing polycarbonate intermediate which is then reacted with a bisphenol, phosgene and a chainstopper under interfacial reaction conditions to afford a product silicone-containing copolycarbonate. The product silicone-containing copolycarbonates have lower haze values than similarly constituted copolycarbonates prepared by other methods.