| 摘要 |
PURPOSE: To obtain a copolycarbonate polymer composed of specific structural units, etc., at specific ratios, having a prescribed intrinsic viscosity, exhibiting excellent solubility in solvent, light resistance and abrasion resistance and useful as a binder resin for electrophotographic photoreceptor. CONSTITUTION: This copolycarbonate polymer is composed of (A) 1-60mol% (based on the total composition) of the structural units expressed by formula I [R1 to R8 are each H, a halogen, a 1-5C alkyl, a 6-12C aryl, etc.; X is O-(CH2 O-)a , (CH2 -). ((a) is 0-20), etc.] and derived from 2,2'-methylenebis[4-(1,1,3,3- tetramethylbutyl)-6-(2H-benzotriazol-2-yl)phenol, etc., and (B) the structural units of formula II (R9 to R12 are each H, a halogen, a 1-5C alkyl, etc.; Y is S, O, etc.) and derived from 2,2-bis(4-hydroxyphenyl)propane, etc., and has an intrinsic viscosity [η] of 0.3-2.00dl/g. The copolycarbonate polymer can be produced by reacting a dihydric phenol of formula III and a dihydric phenol of formula IV with a compound capable of forming a carbonic acid ester.
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