| 摘要 |
PROBLEM TO BE SOLVED: To obtain an arom. polycarbonate resin compsn. excellent in clarity, mechanical properties, moldability, and mold release characteristics and suitable for an optical material by compounding a specific arom. polycarbonate copolymer with a specific phosphorus compd. SOLUTION: This resin compsn. is prepd. by compounding an arom. polycarbonate copolymer with 0.0001-0.05wt.% at least one phosphorus compd. selected from among phosphoric acid, phosphonic acid, phosphinic acid, and their esters. The copolymer is produced under such condition that at least 80mol% of the whole arom. dihydroxy component is accounted for by 1,1-bis(4- hydroxyphenyl)-3,3,5-trimethylcyclohexane and 4,4'-(m-phenylenediisopropylidene) diphenol in a molar ratio of (99:1)-(20:80). A compd. selected from among compds. represented by the formula (wherein R<1> to R<12> are each H, a 1-20C alkyl, etc.) is pref. as the phosphorus compd. |
