| 摘要 |
PURPOSE:To improve the desilvering property and the preservation stability of the sensitive material by incorporating a specified coupler in the sensitive material. CONSTITUTION:The coupler shown by formula I is incorporated in the sensitive material. In the formula, Cp is a coupler residual group, X is O or S atom., etc., Y and Z are each O or S atom., R1 and R2 are each alkylene or arylene group, R3 and R4 are each hydrogen atom. or alkyl group, etc., (l) is 0 or 1, (m) and (n) are each 0-4. The residual group Cp capable of forming a cyan dye is exemplified by phenols or naphtholes. The residual group Cp capable of forming a magenta dye is exemplified by pyrazolones or pyrazolotriazoles. The residual group Cp capable of forming a yellow dye is exemplified by a group shown by formula II, etc. The residual group capable of forming a colorless product is exemplified by a group shown by formula III, etc. In the formula, R17-R19 are each a group being used for a four equivalent coupler, R20 is a ballast group, (l) is 1 or 2. |
