Positive-working immobile photographic compounds and...

C - Chemistry – Metallurgy – 09 – B

Patent

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96/1, 260/171, 2

C09B 29/00 (2006.01) C07D 261/20 (2006.01) G03C 1/06 (2006.01) G03C 8/10 (2006.01)

Patent

CA 1073451

Abstract of the Disclosure Photographic elements, processes for forming images i photographic elements and new compounds are dis- closed. Generally, the invention relates to improved immo- bile 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 sub- stantially lower rate of release of said photographically useful group.

252090

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