| 摘要 |
PURPOSE:To obtain a substrate which has excellent heat resistance, thermal shape retentivity, moisture resistance and water resistance and is further adjusted as desired in refractive index by using a soln. contg. vinyl silane in treating an epoxy resin substrate. CONSTITUTION:A substrate for an optical disk consists preferably of an arom. resin and alicyclic resin in a 9:1-1:9 ratio range. The refractive index is too large if the ratio of the arom. resin is more than said range and conversely the refractive index is too small if the rate of the alicyclic resin is more than said range. A bromoepoxy resin is usable suitably usable as well. A combination of an arom. hardener and alicyclic hardener is preferable as a hardener. The hardened material having the higher refractive index is obtd. with the higher concn. of the arom. ring. The vinyl silane is ethylenic unsatd. silane, e.g. methacryloxy alkyl silane such as gamma-methcryloxy propyl trimethoxysilane and the ratio of the vinyl silane and lower alcohol is preferably 1:8-1:10. |
