| 摘要 |
PROBLEM TO BE SOLVED: To obtain an aromatic-aliphatic copolycarbonate having excellent impact and heat resistances, a high Abbe number and a low photoelastic constant, excellent in color tone and useful as an optical material or the like by adopting a specific transesterification condition. SOLUTION: When performing the transesterification of (A) an aromatic dihydroxy compound (preferably bisphenol A) of formula I [wherein, X a single bond, a group expressed by formula II (wherein, R3 and R4 are each H, a 1-12C alkyl or phenyl) or the like; R1 and R2 are each H, a 1-10C alkyl, a cycloalkyl or the like; (m) and (n) are the number of substituents and are each 0-4] with both (B) a tricyclo(5.2.1.02.6)decanedimethanol of formula II and (C) a carbonic diester (preferably diphenyl carbonate or the like), the aldehyde content in the component B is <=0.5 mg/(1 g component B) in terms of KOH.
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