| 摘要 |
PURPOSE:To record images sufficient in dynamic developed color density, excellent in long-time preservability, free of fading, particularly due to moisture or heat, and free of ground color fogging, by using 4-isopropoxy-4'hydroxydiphenylsulfone as an organic color developer and incorporating a specified compound as a sensitizer. CONSTITUTION:The organic color developer 4-isopropoxy-4'-hydroxydiphenylsolfone of formula [ I ] is a compound having a melting point of 120-130 deg.C. A sensitizer of formula [II] or [III] is used with the color developer, whereby dynamic color forming property can be markedly enhance. In the formulas, A is hydrogen, halogen, nitro, lower alkyl, lower alkoxy or hydroxyl,(l) is an integer of 1-5, and (m) is an integer of 0-3. |
