| abstract |
(57) [Summary] [Purpose] To provide a cast film with surface modification (improvement in lubricity, abrasion resistance, etc.) while maintaining transparency and mechanical properties (bending, pulling, etc.) of polycarbonate. . [Structure] Having a constitutional unit composed of dihydric phenol and polysiloxane, the ratio of the constitutional unit composed of polysiloxane is A cast film from a polycarbonate-polysiloxane copolymer having a concentration of 0.1 to 20% by weight, wherein the concentration of the polysiloxane constitutional unit in the surface layer having a depth of less than 50 Å from the film surface is 50% or more. Polycarbonate copolymer cast film having a concentration of 4 times or more the concentration of siloxane constituent units |