| 摘要 |
PURPOSE:To obtain the title resin having low birefringence and excellent optical characteristics and being useful for a transparent resin material such as an optical recording base. CONSTITUTION:A polycarbonate resin having a reduced viscosity of 0.3dl/g or larger (measured at 25 deg.C in 0.5g/dl soln. in chloroform) is obtd. by reacting a dihydric alcohol (A) of formula I (wherein R1-6 are each H, halogen, 1-6C alkyl or 1-6C alkoxy) and a carbonate deriv. (B) (e.g., phosgene) and, if necessary, in the presence of 1-10mol% monohydric phenol which is an MW controlling agent, based on the component A is an org. base (e.g., pyridine). |
