| 摘要 |
PURPOSE:To improve the dispersibility and dispersion stability of a specific magenta coupler in silver halide emulsions by incorporating said coupler into the photosensitive material. CONSTITUTION:The magenta coupler expressed by the formula I is incorporated in the photosensitive material. In the formula I, X denotes a hydrogen atom or a group which can be eliminated by reaction with the oxidant of an arom. primary amine developing agent; R denotes a hydrogen atom, halogen atom, alkoxy group or alkyl group; R<1> denotes a hydrogen atom or 1-20C straight chain or branched alkyl group; R<2> denotes >=9C branched alkyl group; n denotes 0-4 integer. This coupler is usually usable in a 7X10<-2>-7X10<-1>mol, more characteristic 1X10<-1>-4X10<-1>mol range per 1mol silver halide. The dispersibility and dispersion stability of the coupler in the silver halide emulsion are improved in this way. |
