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1. A polycarbonate resin composition, comprising:
a polycarbonate resin (A) containing a polycarbonate-polyorganosiloxane copolymer (A-1) having a polycarbonate block comprising a repeating unit represented by the general formula (I) and a polyorganosiloxane block comprising a repeating unit represented by the general formula (II); a copolymer (B) having constituent units derived from acrylonitrile and styrene, and being free of a constituent unit derived from methyl methacrylate; a copolymer (C) having constituent units derived from butadiene and methyl methacrylate; and a flame retardant (D), the resin composition satisfying the expression (a):
(Sf−37)×Ch/(Bd+Si)≧37 (a)in the expression (a), Sf represents a flow length (cm) when the resin composition is molded with a spiral flow mold having a cylinder temperature of 240° C., a mold temperature of 40° C., and a thickness of 2.0 mm at a pressure setting of 125 MPa, Ch represents a Charpy impact strength (kJ/m2) at a temperature of 23° C. when the resin composition is molded into a molded body having a thickness of 4 mm, Bd represents a content (mass %) of the constituent unit derived from butadiene in the resin composition, and Si represents a content (mass %) of the polyorganosiloxane block moiety in the resin composition;wherein R1 and R2 each independently represent a halogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms, X represents a single bond, an alkylene group having 1 to 8 carbon atoms, an alkylidene group having 2 to 8 carbon atoms, a cycloalkylene group having 5 to 15 carbon atoms, a cycloalkylidene group having 5 to 15 carbon atoms, a fluorenediyl group, an arylalkylene group having 7 to 15 carbon atoms, an arylalkylidene group having 7 to 15 carbon atoms, —S—, —SO—, —SO2—, —O—, or —CO—, R3 and R4 each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms, a and b each independently represent an integer of from 0 to 4, and n represents an average number of repetitions. |
