摘要 |
PURPOSE:To enhance the stability under a high temp. environment condition without lowering optical characteristics by providing a recording layer containing a specific polymethine type compound on a substrate. CONSTITUTION:An optical recording medium is formed by providing a recording layer 2 containing a polymethine type compound represented by formula (I)(wherein R1-R9 are a hydrogen atom, a halogen atom or a substituent being a monovalent org. residue and at least one of R1-R4 is an aryl substituted at three places of 1-, 4- and 6-positions, m is 0 or 1, n is 0, 1 or 2 and X<-> is an anion) on a substrate 1. As the substrate 1, plastic such as polycarbonate, polyester, an acrylic resin, a polyolefin resin, a phenol resin, an epoxy resin, polyamide or polyimide, glass or metals can be used. The recording layer 2 is formed on the substrate by various methods such as a coating method, a vapor deposition method and the like and, in the case using the coating method, the recording layer is formed by applying a solution prepared by dissolving or dispersing the polymethine type compound in an org. solvent to the substrate 1. |