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.
揭示了一种彩色感光元素,其中包括至少三个感光单元,它们的各自灵敏度在不同的波长区域内,包括至少一种成像层,该成像层包括感光性
银卤乳剂、粘合剂和黄色偶合剂,该黄色偶合剂由以下结构表示:其中CO
UP是一种光敏偶合剂残留物,能够与氧化的彩色显影剂偶合形成第一种黄色
染料L是选择自—OC(═O)—、—OC(═S)—、—SC(═O)—和—SC(═S)—的连接基团,而—DYE是可释放的第二种黄色
染料或黄色
染料前体,其中CO
UP是一种含有一个或多个电子吸引基团的
乙酰苯胺化合物,使得偶合位点的pKa小于8.7。这种黄色偶合剂可以提高活性和增强
染料密度。