Color-forming para-sulfonamidodiphenylamines and their corresponding sulfonimide dyes are useful in imaging materials. Described is a color-forming dye precursor compound which is a diphenylamine, phenylnaphthylamine or an acid salt thereof comprising a first benzene ring attached by an -NH- group to a second benzene ring or a naphthalene nucleus wherein
(a) the first ring has an electron donating group in a meta or para position.
(b) the second benzene ring or the naphthalene nucleus has a sulfonamido group in its para position,
(c) the compound is free of sulfonamido groups in each of its ortho positions, and
(d) is capable, in oxidized form, of forming a sulfonimide dye; all ring positions being relative to the -NH- group.
The corresponding sulfonimide dyes are formed by oxida- - tion of the color-forming sulfonamidodiphenylamines by means of a suitable oxidizing agent, such as the oxidized form of a cross-oxidizing silver halide developing agent.
成色对磺酰胺
二苯胺及其相应的磺
酰亚胺染料可用于成像材料。描述了一种成色
染料前体化合物,它是一种
二苯胺、苯基
萘胺或其酸盐,包含一个通过-NH-基团连接到第二苯环或
萘核的第一苯环,其中
(a) 第一苯环在元位或对位有一个电子捐赠基团。
(b) 第二苯环或
萘核的对位上有一个磺酰胺基团、
(c) 该化合物的每个正位都不含磺酰胺基团,且
(d) 在氧化状态下能形成磺
酰亚胺染料;所有环位置均相对于-NH-基团。
相应的磺
酰亚胺染料是通过适当的氧化剂(如交叉氧化型卤化
银显影剂的氧化形式)氧化成色的
磺胺二苯胺而形成的。