| 摘要 |
<p>PURPOSE:To improve surface smoothness and to improve color reproducibility by executing color developments in the presence of a color developing agent and specific couplers. CONSTITUTION:At least one of the color developments are executed in the presence of the color developing agent and at least one of the couplers expressed by formula I and at least one of the couplers which form a substantially colorless compd. by making coupling reaction with the oxidant of the color developing agent and at least one of the other color developments are executed in the presence of the color developing agent and at least one of the couplers expressed by formula II or III. In the formula, R and Y denote a hydrogen atom or substituent; X denotes a hydrogen atom or a group which can be eliminated by the coupling reaction with the oxidant of the color developing agent; Za, Zb, Zc denote a methine group, =N- group or NH- group; Z denotes a nonmetal atom group necessary for forming a nitrogenous heterocycle; R1 denotes a substituent; R2 denotes a substituent to be combined with the carbon atom of the heterocycle. The color reproducibility is improved in this way and the surface smoothness and heat resistance are enhanced.</p> |
