Pyrazolotriazole couplers having a ballast-containing group of the formula (I) attached to the pyrazolotriazole ring group
wherein:
R, R², Ra and Rb represent hydrogen or a substituent;
L is a divalent linking group connecting the ballast containing group to the pyrazolotriazole ring;
L' is a linking group connecting the -BD group to the phenylene ring;
n is 0 or 1;
B represents -N(Rc)-SO₂-, wherein Rc represents hydrogen or a substituent; and
D represents substituted or unsubstituted alkyl are useful in silver halide photographic materials and processes. The couplers exhibit increased coupling efficiency, and provide formation of dyes having improved maximum magenta image dye density when employed in color photographic materials and processes.
吡唑三唑
偶联剂,其
吡唑三唑环基上连接有式(I)的含碴基团
其中
R、R²、Ra 和 Rb 代表氢或取代基;
L 是连接含碴基团和
吡唑三唑环的二价连接基团;
L' 是连接 -BD 基团和亚苯基环的连接基团;
n 为 0 或 1;
B 代表-N(Rc)-SO₂-,其中 Rc 代表氢或取代基;以及
D 代表取代或未取代的烷基。这些
偶联剂的偶联效率更高,在彩色感光材料和工艺中使用时,可形成具有更高的最大品红图像
染料密度的
染料。