A photographic silver halide material comprising a compound which is capable of being reduced by a silver halide developing agent at a rate slower than that of image-wise developable silver halide and in reduced state is capable of releasing a photographically useful group, characterized in that said compound corresponds to the following formula :
wherein :
R10 and R20 (same or different)
(1) represent an alkyl group, a cycloalkyl group, an alkenyl group, a cycloalkenyl group or an aralkyl group including said groups in substituted form,
(2) represent an aryl group including a substituted aryl group, or
(3) represent a heterocyclic ring residue including such residue in substituted form or
R'° and R20 are ringclosed, either R'° or R20 containing a ballasting group conferring diffusion resistance to the com- pond in hydrophilic colloid media when penetrated by an aqueous alkaline liquid;
L' and L2 (same or different) represent a
NHCO-:
group;
p and q (same or different) represent an integer 0 or 1;
Z represents an atom or an atom group which is electronegative with respect to carbon, and
PUG represents together with Z a releasable photographically useful group.
一种摄影用卤化
银材料,由一种化合物组成,该化合物能被卤化
银显影剂还原,还原速度慢于图像显影用卤化
银的还原速度,并且在还原状态下能释放出对摄影有用的基团,其特征在于所述化合物符合下式:
其中 :
R10 和 R20(相同或不同)
(1) 代表烷基、
环烷基、
烯基、环
烯基或芳基,包括上述取代形式的基团、
(2) 代表芳基,包括取代的芳基,或
(3) 代表杂环残基,包括取代形式的杂环残基,或
R'° 和 R20 是闭环的,其中任一 R'° 或 R20 含有一个压载基团,当被
水性碱性液体渗透时,可使组合物在亲
水性胶体介质中具有抗扩散性;
L' 和
L2(相同或不同)代表一个
NHCO-:
基团;
p 和 q(相同或不同)代表整数 0 或 1;
Z 代表相对于
碳呈电负性的原子或原子团,以及
PUG 与 Z 一起代表可释放的摄影用基团。