| 摘要 |
PURPOSE:To enable coating to be uniformily performed without breaking (whitening, groove sags, etc.) an injection molding plastic transparent base board, by a method wherein ketone alcohol is used as an origanic solvent when an optical recording medium is formed by drying after coating an organic solvent solution of a laser absorbing dye on a transparent substrate. CONSTITUTION:Ketone alcohol is used as an organic solvent when an optical recording medium is formed by drying after coating an organic solvent solution of a laser absorbing dye on a transparent substrate. An injection molding transparent plactic subtrate is used as the transparent substrate. Glass, plastics, etc., are mentioned as the transparent subtrate, and plastics are preferable. Acrylic resin, methacrylic resin, etc., are mentioned as the plastics. A dye which is dissolved in ketone alcohol series solvent by a high concentration is mentioned as the laser absorbing dye, and that which has absorption at 600-900nm in wavelength band range and of which molecular absorption coefficient is 10<4>-10<5>cm<-1>, is preferable. Then, compounds represented by formulas I-IV are preferable as the laser absorbing dye. |
