G - Physics – 03 – C
Patent
G - Physics
03
C
96/100, 96/274,
G03C 8/10 (2006.01)
Patent
CA 1121641
MIXTURE OF NONDIFFUSIBLE REDOX DYE-RELEASERS FOR CURVE SHAPE CONTROL ABSTRACT OF THE DISCLOSURE Curve shape control, especially for lower scale contrast, of a photographic element is achieved by employing with the silver halide emulsion layer two nondiffusible redox dye-releasing compounds of different relative reactivi- ties, the reactivity of the compound which is more reactive being at least 1.5 times the reactivity of the compound which is less reactive. Preferred compounds are ballasted sulfon- amido compounds, each of which has a color-providing moiety attached thereto through a sulfonamido group which is alkali- cleavable upon oxidation. Preferred more reactive sulfon- amido compounds have a N,N-disubstituted carbamoyl ballast group. The color-providing moieties can be (1) transferred imagewise to an image-receiving layer to provide a useful image, or (2) can be merely diffused out of the element to provide a retained image therein which can be treated to form a color transparency or a motion picture film.
333401
Maier Thomas O.
Richards Jack L.
Eastman Kodak Company
Gowling Lafleur Henderson Llp
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