| 摘要 |
1,159,180. Photographic materials containing ultraviolet absorbers. EASTMAN KODAK CO. Nov. 2, 1967 [Nov.3, 1966], No.49908/67. Heading G2C. [Also in Division C2] Compounds of the general formula I in which Z 1 and Z 2 each represent a hydrogen atom, an alkyl group or an aryl group and the groups R 1 - R 8 each represent a hydrogen atom or an alkyl, phenalkyl or cycloalkyl group so that atleast two of the groups R 1 - R 4 and at least two of the groups C 5 - C 8 are other than hydrogen, are used as optical brightening agents in photographic materials. They may be incorporated in a hydrophilic colloid layer coated over at least one light-sensitive layer or in a layer under at least one light-sensitive layer. They may also be used as ultraviolet absorbers in photographic silver halide materials. They may be incorporated in colour-photographic materials which contain colour-forming couplers or in such materials in which the images one found by colour development with colour-forming couplers contained in the developing solution. They may also be used to protect and brighten colour-photographic elements of the type used in silver-dye-bleach processes. They may also be used as ultraviolet absorbing materials in diffusion transfer processes, such as, for example, processes in which colourphotographic records are reproduced by transferring either solubilized or coupler-developed dyes for a light-sensitive element to a receiving sheet.
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