| 摘要 |
PROBLEM TO BE SOLVED: To enhance coloring sensitivity by using a fluorane compound expressed by a specific structural fomula as an electron donative coloring agent, and further using 2-(2,4-dimethylanilino)-3-methyl-6-diethylaminofluorane at a specific ratio of weight to the fluorane compound. SOLUTION: As an electron donative coloring agent, at least one kind of a fluorane compound expressed by formula is used, and 2-(2,4-dimethylanilino)-3- methyl-6-diethylaminofluorane of 2-20 pts.wt. is used to a fluorane compound of 100 pts.wt. In the formula, R<1> , R<2> show 1-5C alkyl group respectively independently. The electron donative coloring agent of this component greatly improves coloring sensitivity and preservability of coloring images, and the maintenance of ground whiteness. |
