| 摘要 |
PURPOSE:To improve the optical stability of an org. coloring material without degrading the hue and purity of a coloring matter or dye constituting the coloring material by allowing the org. coloring material and at least one kind of the compds. expressed by the specific formulas to co-exist. CONSTITUTION:The org. coloring material and at least one kind of the compds. expressed by the formula are allowed to co-exist to prevent the photofading of the org. coloring material. A quinoneimine dye, methine and polymethine dyes, azo dye, anthraquinone dye, indoamine and indophenol dyes, etc., are used as the org. coloring material. In the formula, R<1> and R<2> denote a hydrogen group of alkyl group, cycloalkyl group, alkenyl group, cycloalkenyl group, alkinyl group, aryl group, heterocyclic group, etc., which respectively may have substituents. And R<2> is a substituted group, m is 0 or 1-6 integer; plural R<2> may be the same or different when m is 2-6 integer. |
