| 摘要 |
PURPOSE:To increase color development and fresh preservation capabilities as well as the stability of a color-developing image and thereby allowing a color developing section to absorb light from a near infrared region by adding a specific substance with molecules containing an oxazine ring substituted with an oil-soluble group and an electron-acceptive compound. CONSTITUTION:A fluorene derivative as a specific substance means di-substituted aminofluorene compound with oxazine in the ninth position, and the preferable type is such as expressed by the following formula: In the formula, R<1>, R<2>, R<3>, R<4>, R<5> and R<6> are alkyl groups, alkenyl groups, alkinyl groups, allyl groups and hydrogen atoms, and these may be the same or different. R<7> is an oil-soluble group. In addition, the substituted groups expressed by R<1>, R<2>, R<3>, R<4>, R<5> and R<6> may be substituted with alkyl groups, alkoxy groups, alkylthio groups, aryl groups, aryloxy groups, halogen atoms, nitro groups, cyano groups, substituted amino groups, substituted carbamoyl groups, substituted sulfamoyl groups, substituted oxycarbonyl groups or substituted oxysulfonyl group heterocyclic rings, etc. |
