G - Physics – 03 – C
Patent
G - Physics
03
C
96/36, 96/43
G03C 7/00 (2006.01) G03C 5/30 (2006.01) G03C 7/305 (2006.01) G03C 8/10 (2006.01) G03C 8/18 (2006.01)
Patent
CA 1057551
Abstract or the Disclosure Photographic elements, processes for forming images in photographic elements and new compounds are dis- closed. Generally, the invention relates to immobile com- pounds 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 sub- stantially 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 pho- tographically useful moiety wherein said electrophilic cleavage group is a carbamic acid derivative.
235164
Chasman Richard A.
Fields Donald L.
Henzel Richard P.
Lau Philip T. S.
Eastman Kodak Company
Na
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