Polycarbonate-based resin composition and molded article thereof

A polycarbonate-based resin composition, comprising:

• (A) 100 parts by mass of a resin mixture comprising
• (A-1) from 40 to 100 mass% of a polycarbonate-polyorganosiloxane copolymer comprising a constituent unit represented by formula (I):
• and a constituent unit represented by a general formula (II):
• wherein an average number of repetitions of the constituent unit represented by formula (II) is 80 to 500, and
• (A-2) from 60 to 0 mass % of an aromatic polycarbonate resin except the polycarbonate-polyorganosiloxane copolymer (A-1);
• (B) 0.01 to 0.15 part by mass of an alkali metal salt, an alkaline earth metal salt, or both, of an organosulfonic acid;
• and
• (C) 0.1 to 1 part by mass of a mixed powder comprising polytetrafluoroethylene particles and organic polymer particles,
• wherein:
• a content of a polyorganosiloxane block moiety comprising the constituent unit represented by formula (II) in the resin mixture (A) is 2 to 30 mass %;
• the composition is free of an organohalogen-based flame retardant and an organophosphate-based flame retardant;
• R1 and R2 each independently represent an alkyl group or 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, —S—, —SO—, —SO2—, —O—, or —CO—;
• R3 and R4 each independently represent a hydrogen atom, or an alkyl group or aryl group optionally comprising a substituent;
• a and b each independently represent an integer of 0 to 4;
• I represents an average number of repeating units and represents an integer of 80 to 500;
• a notched Izod impact strength of the composition at 23° C. is at least 78 kJ/m2;
• a notched Izod impact strength of the composition at −40° C. is greater than 43 kJ/m2;
• and
• the composition is free of an organic polymer that comprises styrene, a (meth)acrylate-based monomer, and butadiene.