| 摘要 |
<p>A polycarbonate copolymer contains 0.1 to 50 mol% of a monomer unit represented by the following formula (1); and a monomer unit represented by the following formula (2). In the polycarbonate copolymer the content of a biphenyl compound having three phenolic hydroxyl groups in one molecule is 200 mass ppb or less.
In the formula R 1 and R 2 each independently represent a hydrogen atom, an aliphatic hydrocarbon group having 1 to 6 carbon atoms, an aryl group having 6 to 12 carbon atoms or a halogen atom. In the formula R 3 and R 4 each independently represent a hydrogen atom, an aliphatic hydrocarbon group having 1 to 6 carbon atoms, an aryl group having 6 to 12 carbon atoms or a halogen atom; and X represents any one of bonding groups represented by -O-, -S-, -SO-, -SO 2 -, -CO-, 9,9- fluorenylidene group.</p> |
