Polycarbonate-polydiorganosiloxane copolymer

摘要

PROBLEM TO BE SOLVED: To provide a polycarbonate-polydiorganosiloxane copolymer which maintains extremely high flame retardancy. A polycarbonate-polydiorganosiloxane copolymer containing a polycarbonate block represented by the following general formula [1], a polydiorganosiloxane block containing an alkenyl group, and a polydiorganosiloxane block containing no alkenyl group. (In the above general formula [1], R1 and R2 are independently hydrogen atoms, halogen atoms, alkyl groups having 1 to 18 carbon atoms, etc., e and f are integers of 1 to 4, respectively, and W is a single bond. Bond or oxygen atom, sulfur atom, etc.) [Selection diagram] None