POLYCARBONATE-POLYORGANOSILOXANE COPOLYMER, PROCESS FOR PRODUCTION OF THE COPOLYMER, AND POLYCARBONATE RESIN CONTAINING THE COPOLYMER

摘要

A polycarbonate-polyorganosiloxane copolymer (A-1) comprising a polycarbonate block composed of a specific constituent unit and a polyorganosiloxane block composed of a specific constituent unit, wherein the copolymer is characterized in that (1) the content of the polyorganosiloxane block moiety is 1 to 30 mass%, (2) the average repeating unit number of constituent units represented by general formula (II) is 70 to 1000, (3) the copolymer has a viscosity average molecular weight of 13000 to 26000, and (4) the content of a phenol residue having an allyl group in the copolymer is 400 ppm by mass or less, and wherein the copolymer enables the production of a molded article having excellent thermal stability and a good color even when the molding is carried out at a higher temperature; a process for producing the polycarbonate-polyorganosiloxane copolymer; and a polycarbonate resin produced using the polycarbonate-polyorganosiloxane copolymer.