| abstract |
(57) [Abstract] [Problem] Excellent mechanical properties such as transparency and impact resistance. Provided is a copolymer polycarbonate resin which maintains a good balance between the refractive index and the Abbe number, has excellent optical characteristics such as a low photoelastic constant, and has good fluidity. SOLUTION: This is a copolymer polycarbonate resin comprising a structural unit of an aliphatic diol having a specific structure and a structural unit of a dihydric phenol, wherein a ratio of the structural unit of the aliphatic diol to the structural unit of the dihydric phenol is m. : When n (molar ratio) (where m + n = 1), the ratio of the constituent units of the aliphatic diol and the constituent units of the dihydric phenol alternately arranged on the polymer main chain is 2.05 × m × n or more. |