| 摘要 |
PURPOSE:To reduce the color stain and the color fogging of the titled material by incorporating a compd. capable of releasing a development restrainer by a coupling reaction with an oxidant of a developing agent and a specific hydroquinone compd. in the emulsion layer of the titled material. CONSTITUTION:The compd. capable of releasing the development restrainer or its precursor by the coupling reaction with the oxidant of the developing agent and the hydroquinone compd. shown by the formula in the silver halide emulsion layer of the titled material. In the formula, Ra and Rb are each hydrogen or halogen atom or sulfo, carboxyl, alkyl, acylamino, alkoxy, aryloxy, alkylthio, arylthio, sulfonyl, acyl, carbamoyl or sulfamoyl group, Ra and Rb together with each other may form a carbon ring, X is -CO- or -SO2- group, Rc is alkyl, aryl or a heterocyclic group, etc., the total of the carbon atoms of Ra and Rb and Rc groups is >=10. Thus, the color stain of the titled material is reduced, and the color sharpness of the titled material is improved by incorporating said compds. in the titled material. |
