| 摘要 |
The lubricant which is incorporated into the polycarbonate resin is a complex ester formed by partial esterification of pentaerythritol with a C5 to C9 aliphatic carboxylic acid followed by reaction with a C4 to C8 aliphatic dicarboxylic acid to form a material represented by the structural formula: [RCO2CH2]3CCH2O[CO(CH2)xCO2CH2C(CH2O2CR)2CH2O]y-CO(CH2)xCO2CH2C[CH2O2CR]3 wherein the above formula y has an average value of from 3 through 12; x has a value of 2 to 6 and R is an aliphatic hydrocarbon group of from 5 to 9 carbon atoms.
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