| 摘要 |
PURPOSE:To obtain an optical information-recording medium having high reflectance and recording sensitivity, ensuring stable writing and reproduction of optical signals, having high moisture stability and free of environmental pollution problems, by providing a recording layer comprising a specified organic coloring matter. CONSTITUTION:A recording layer comprising a coloring matter of formula I can be obtained by dissolving the coloring matter in a solvent such as ethyl acetate, toluene and an alcohol, and applying the resultant solution to a base by a spinner method, a dipping method, a roll coater method or the like to provide a thin film of the base. In formula I, R1 is a 1-6C alkyl, aralkyl or phenyl, R2 is a 1-18C alkyl, aralkyl, allyl or phenyl, A is formula II or III (wherein R3 is hydrogen or a 1-6C alkyl), X is an anion selected from perchlorate ion, fluoroborate ion and the like, Y is a 1-18C alkyl, -R5OH or -R5COOH, and m is 1 or 2. |
