abstract |
(57) [Summary] [Purpose] A novel polycarbonate-polysiloxane block copolymer. A block copolymer suitable as a molding resin having a polycarbonate block and a polysiloxane block derived from a bisphenol siloxane is provided. Weight percentage of polycarbonate block (%) Is 92 to 96%, and the weight ratio (%) of the siloxane derived from the polysiloxane block is 4 to 8%. |