Polycarbonate resin composition including polycarbonate-polyorganosiloxane copolymer, and molded article of same

A polycarbonate-based resin composition (A′), comprising:

• 90 mass % to 10 mass % of a polycarbonate-polyorganosiloxane copolymer (A-1′) having a polycarbonate block containing a repeating unit represented by the following general formula (I) and a polyorganosiloxane block containing a siloxane repeating unit represented by the following general formula (II), and having a ratio of terminal hydroxyl groups of 5 mol % or less;
• and
• 10 mass % to 90 mass % of a polycarbonate-polyorganosiloxane copolymer (A-3) having a polycarbonate block containing a repeating unit represented by the general formula (I) and a polyorganosiloxane block containing a siloxane repeating unit represented by the following general formula (II), and having a ratio of terminal hydroxyl groups of from 7 mol % to 70 mol %,
• wherein a content of a polyorganosiloxane block moiety in the composition (A′) is from 0.7 mass % to 40 mass %:
• 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—, and a and b each independently represent an integer of from 0 to 4;
• and
• 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, and an average number n of repetitions represents a total number of siloxane repeating units in the polyorganosiloxane block.