| 摘要 |
1,139,014. Luminescent screens. EASTMAN KODAK CO. 6 July, 1967 [8 July, 1966], No. 31099/67. Heading C4S. [Also in Division G2] Fluorescent layers for use in photographic materials are obtained by dissolving a waterinsoluble organic fluorescent compound and a water-insoluble carrier for said fluorescent compound which forms a solid solution therewith, e.g. polymers of styrene and copolymers thereof with alkyl acrylates or poly-vinyl benzoate, in a solvent which is water-soluble, e.g. ethylacetate, or contains a water-soluble component, dispersing the solution into a colloidal state in an aqueous solution of an hydrophilic film-forming binder, e.g. gelatine, casein, cellulose, or vinyl polymers, washing the dispersion with water to remove the water-soluble solvent, coating the washed dispersion on a support and drying. The fluorescent layer may be a silver halide emulsion layer, an overcoat or undercoat layer for such an emulsion layer or a backing layer of a photographic silver halide material. The dispersion is washed by coagulating or gelling the dispersion in the aqueous hydrophilic colloid and then washing. The fluorescent layer may contain pigments, hardeners or colour couplers and may have a silver halide emulsion and/or a coating containing an electrically conductive compound between itself and the support, e.g. cuprous iodide in a poly-(methyl acrylate, vinylidene chloride, itaconic acid) terpolymer. Specified fluorescent compounds are 3-phenyl-7- ureido coumarin, diphenyl oxazole and 1,4-bis- (2-(5-phenyl-oxazolyl))-benzene. A protective layer of vinylite and a cellulosic nitrate subbing layer may be applied over the electrically conductive layer to bond a silver halide emulsion thereon. |
