| 摘要 |
PROBLEM TO BE SOLVED: To obtain a polycarbonate resin composition scarcely being colored, excellent in transparency, mechanical physical properties, heat resistance, etc., having low birefringence, excellent in moldability and useful for optical parts by mixing a specific polycarbonate copolymer with a phosphite ester compound at a specific ratio. SOLUTION: This polycarbonate resin composition comprises (A) 100 pts.wt. of a polycarbonate copolymer comprising repeating structural units of formulas I and II [R is an alkyl or the like; R2, R3 are each H or the like; R4 is an alkoxy or the like; (k) is 0-3; (1) is 0-2], preferably containing the repeating structural units of formula I in amount of 5-90 mol.%, and preferably having a weight-average mol.wt. of 10,000-150,0000, and (B) 0.0005-5 pts.wt. of a phosphite ester compound [for example, tris(2,4-di-tert-butylphenyl)phosphite]. The component A is obtained, for example, by reacting 6,6'-dihydroxy-3,3,3',3'- tetramethyl-1,1-spirobiindane, etc.
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