| 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(i) 0.02<(b)/(d)<0.8(ii) 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.
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