| 摘要 |
1,110,046. Photo-sensitive material. MINNESOTA MINING & MANUFACTURING CO. April 27, 1965 [April 27, 1964], No.12762/65. Heading G2C. A photo-sensitive layer comprising a silver salt of an organic acid containing therein a catalytic amount (as defined) of a silver halide formed from the silver salt, is developable by heating between 90 to 150‹C. in the presence of a mild reducing agent (as defined), which may be in the photo-sensitive layer. Positive images may be prepared by contacting a developed layer containing a volatilizable reducing agent with a receptor sheet comprising a uniformly exposed photosensitive layer of the invention not containing a reducing agent, and heating to effect transfer of unused reducing agent to the receptor sheet and reaction with the silver salt therein. The mild reducing agent may be hydroquinone methylhydroxynaphthalene, methyl gallate, catechol, phenylenediamine, p-aminophenol and 1-phenyl pyrazolidone, and the organic acid may be a C 14-22 fatty acid. The silver halide may be formed by treating the silver salt with a gaseous hydrogen halide, or an aqueous solution of a metal halide or an ionizable organic halide (e.g. a sensitizing dye). The photo-sensitive layer may be supported and contain binders, organic acid stabilizers, sensitizing dyes, desensitizers (e.g. benztriazole and phenyl-mercaptotetrazole) and whitening agents (e.g. ZnO and Ti0 2 ). |
