申请人:Eastman Kodak Company
公开号:US04139379A1
公开(公告)日:1979-02-13
Photographic elements, processes for forming images in photographic elements and new compounds are disclosed. Generally, the invention relates to ballasted electron-accepting nucleophilic displacement compounds; after acceptance of at least one electron (reduction) by a nucleophile precursor group, the compounds are capable of undergoing intramolecular nucleophilic displacement to release a diffusible moiety, such as an image dye or a photographic reagent. In certain embodiments, the ballasted electron-accepting nucleophilic displacement compounds are used in combination with electron donors and electron-transfer agents. The processes disclosed are particularly useful in providing positive transfer images using negative-working silver halide emulsions.
本发明公开了摄影元素、形成摄影元素中图像的过程以及新化合物。一般而言,本发明涉及负载的电子受体亲核置换化合物;在核前体基团接受至少一个电子(还原)后,该化合物能够经历分子内亲核置换以释放可扩散的基团,例如图像染料或摄影试剂。在某些实施例中,负载的电子受体亲核置换化合物与电子给体和电子转移剂结合使用。所公开的过程在使用负作用银卤化物乳剂提供正转移图像方面特别有用。