| 摘要 |
The present invention provides a copolycarbonate that has a low photoelastic constant and has fewer foamed cells and that is in particular suitable for use in optical fields. The present invention is a copolycarbonate containing 10 to 90 mol% of a unit (A) derived from spiroglycol and 90 to 10 mol% of a unit (B) derived from aromatic phenol and having terminals satisfying the following expressions (i) and (ii), 0.0001 < a / d < 0.1 0.02 < b / d < 0.8
wherein (a) is an amount of a terminal group derived from spiroglycol, (b) is an amount of a terminal group derived from aromatic phenol, and (d) is a total terminal group amount. |
