| 摘要 |
PURPOSE:To contrive the improvement of light resistance of an optical information recording medium and prevention of deterioration on reproduction, by incorporating a specified dithiol complex compound into an organic thin-film recording layer comprising a polymethine coloring matter as a main constituent. CONSTITUTION:Addition of a compound of the formula to a recording layer produces an excellent effect in improving the light resistance of an optical information recording medium and in preventing deterioration on reproduction. The effect is augmented when the compound of the formula is added to not only the recording layer but also other layer, e.g., an undercoat layer or a protective layer or both of them. The weight ratio of a polymethine coloring matter to the compound of the formula in the recording layer is 30:70-99:1, preferably, 60:40-95:5. |
