| 摘要 |
Disclosed is a substantially chlorine-free polycarbonate resin for use in the production of a substrate for an optical information medium, which is produced by transesterification reaction and which comprises a plurality of aromatic polycarbonate main chains, each comprising recurring units each independently represented by formula (1):wherein the polycarbonate main chains collectively contain therein at least one heterounit (A) of formula (2):and at least one heterounit (B) of formula (3):wherein the sum of the amounts of (A) and (B) is from 0.03 to 0.3 mole %, based on the total molar amount of units (1), and the amount of (A) is at least 50 mole %, based on the total molar amount of (A) and (B), the weight average molecular weight of the polycarbonate resin being from 13,000 to 18,000.
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