Dye precursors, photographic elements containing them and methods of image formation
申请人:EASTMAN KODAK COMPANY
(a New Jersey corporation)
公开号:EP0093556A2
公开(公告)日:1983-11-09
A diphenylamine compound that is a precursor for a phenazine dye comprises, in an ortho position to the amine of the diphenylamine, a sulfonyldiamido group (-NHS02-NH-) that is capable of releasing a sulfonylamine fragment upon oxidation. The diphenylamine compound upon oxidation intramolecularly cyclizes to a phenazine dye. The sulfonylamine fragment is capable of thermally releasing ammonia or an amine. The diphenylamine compound and sulfonylamine fragment are useful in imaging materials such as photothermographic materials. Ammonia or an amine thermally released from the sulfonylamine fragment enables imaging in imaging materials that are responsive to ammonia or an amine. The diphenylamine compound also is a silver halide developing agent.
作为酚嗪染料前体的二苯胺化合物,在二苯胺胺的正交位置包含一个磺酰二胺基团(-NHS02-NH-),该基团在氧化时能够释放出一个磺胺片段。二苯胺化合物在氧化后分子内环化为酚嗪染料。磺胺片段能够在热作用下释放出氨或胺。二苯胺化合物和磺胺片段可用于成像材料,如光热成像材料。磺胺片段受热释放出的氨或胺可以在对氨或胺有反应的成像材料中成像。二苯胺化合物也是一种卤化银显影剂。