申请人:Eastman Kodak Company
公开号:US04108850A1
公开(公告)日:1978-08-22
Photographic elements, processes for forming images in photographic elements and new compounds are disclosed. Generally, the invention relates to immobile compounds which can be used to provide positive images from negative recording-developing photographic materials such as negative silver halide emulsions. The compounds contain a photographically useful group such as a dye or dye precursor and are capable of releasing said photographically useful group under alkaline conditions, and are also capable of reaction with an oxidized silver halide developing agent before substantial release of said photographically useful group occurs, to provide a reaction product having a substantially lower rate of release of said photographically useful group. In specific embodiments, the compounds of this invention contain an electrophilic cleavage group located in the linkage between a ballast group and a photographically useful moiety wherein said electrophilic cleavage group is a carbamic acid derivative.
本发明涉及摄影元素、形成摄影元素中图像的过程以及新化合物。一般而言,本发明涉及不可移动的化合物,可用于从负记录-显影摄影材料(如负银卤乳剂)中提供正像。这些化合物包含一个摄影有用基团,例如染料或染料前体,并能够在碱性条件下释放所述摄影有用基团。同时,在所述摄影有用基团实质释放之前,它们也能够与氧化银卤显影剂发生反应,以提供一个反应产物,其具有较低的摄影有用基团释放速率。在具体实施方式中,本发明的化合物包含位于托架基团和摄影有用基团之间的连接中的亲电解剖基团,其中所述亲电解剖基团是一种氨基甲酸酯衍生物。