| 摘要 |
<p>A polycarbonate copolymer which comprises 30 to 70 mol% of a structural unit comprising a bisphenyl fluorene structure and 70 to 30 mol% of a structural unit comprising tricyclo [5.2.1.0 2,6 ] decanedimethanol and causes little occurrence of birefringence even when extrusion, injection molding or stretch processing is conducted and a process for producing the same.</p> |
