| 摘要 |
PURPOSE:To obtain an optical polycarbonate resin molding low in hygroscopicity, excellent in transparency, heat resistance, etc., and small in double refraction, by using a norbornane ring-containing 4,4'- dihydroxydiphenylalkane as the principal component. CONSTITUTION:A norbornane ring- or alicyclic structure-bonded norbornane ring-containing, 4,4'-dihydroxydiphenylalkane of formula I (wherein R is a group of formula II, III, IV or the like, and A, B and X are each H, a 1-6 C aliphatic hydrocarbon or a halogen), e.g., 4,4'-(2-norbornylidene)-diphenol is reacted with phosgene or a carbonic diester to produce an aromatic polycarbonate. This aromatic polycarbonate or its mixture with, e.g., an aromatic polycarbonate obtained from bisphenol A is molded to obtain an optical polycarbonate resin molding. |
