A color photographic element is disclosed comprising at least three light-sensitive units which have their individual sensitivities in different wavelength regions, comprising at least one imaging layer comprising a light-sensitive silver-halide emulsion, binder, and a yellow coupler represented by the following structure:
Wherein COUP is a photographic coupler residue capable of coupling with oxidized color developer to form a first yellow dye L is a linking group selected from the group consisting of -OC(=O)-, -OC(=S)-, -SC(=O)-, and -SC(=S)-, and -DYE is a releasable second yellow dye or yellow dye precursor, wherein COUP is an acetanilide compound that contains one or more electron-withdrawing groups such that the pKa at the coupling site is less than 8.7. Such yellow couplers improve activity and enhance dye densities.
本发明公开了一种彩色感光元件,该元件由至少三个感光单元组成,它们在不同的波长区域具有各自的感光度,至少包括一个成像层,该成像层由感光卤化
银乳剂、粘合剂和黄色耦合剂组成,其结构如下:
其中 CO
UP 是能与氧化
显色剂偶联形成第一种黄色
染料的感光
偶联剂残基 L 是选自-OC(=O)-、-OC(=S)-、-SC(=O)-和-SC(=S)-的连接基团,-DYE 是可释放的第二种黄色
染料或黄色
染料前体,其中 CO
UP 是
乙酰苯胺化合物,它含有一个或多个抽电子基团,使偶联位点的 pKa 小于 8。7.这种黄色
偶联剂可提高活性和
染料密度。