| 摘要 |
PURPOSE:To maintain surface smoothness of a film and to obtain excellent wearing resistance and lubricating property by laminating a signal recording layer, metal film layer, biaxially oriented polyester film and specific coating layer in the order. CONSTITUTION:A thermoplastic resin substrate is softened with solvents or heat and modified to form the signal recording layer, on which an Al vapor deposition film of 5-10<4>nm thickness is provided. Then the polyester film is provided which contains aromatic dicarboxylic acid such as terephthalic acid or aliphatic carboxylic acid such as adipic acid as the acid content and ethyleneglycol, etc., as the alcohol content. The energy of fusion of the polyester resin is selected to be 3-11cal/g to improve the moldability and adhesion of the film. The surface coarseness of the metal film side is specified to be <=0.02 to obtain good adhesion to the Al film. The coating layer contains >=70wt% of nonactive inorganic powder, such as TiO2 with average particle size of 0.11-0.70mum and water-soluble or water-dispersible resin. The proportion of the average particle size D of the inorganic powder to the thickness d of the coating layer is selected to 1.1-80. By this constitution, such an optical recording medium cheap and having good qualities can be obtained. |
