| 摘要 |
<p>An optical disk substrate formed substantially of an aromatic polycarbonate from an aromatic dihydroxy component containing at least 20 mol% of 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, wherein: (A) the aromatic polycarbonate has a specific viscosity of 0.2 to 0.5, (B) the aromatic polycarbonate shows a water absorption percentage of 0.2 % by weight or less, (C) the aromatic polycarbonate has an oligomer content of 10 % or less, and (D) the number of undissolved particles having a diameter of 0.5 mu m or greater is 25,000 pieces or less per g of the polycarbonate resin, and the number of undissolved particles having a diameter of 1 mu m or greater is 500 pieces or less per g of the polycarbonate resin, and an optical disk from the above substrate.</p> |
