C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
96/32, 260/174.3
C09B 29/00 (2006.01) G03C 1/40 (2006.01) G03C 8/10 (2006.01)
Patent
CA 1244011
- O - NAPHTHOQUINONE REDOX DYE-RELEASERS Abstract of the Disclosure Photographic elements and diffusion transfer assemblages are described which employ a nondiffusible, positive-working, redox dye-releaser having the formula: Image wherein: (a) R1 represents a substituted or unsubstituted alkyl group of from 1 to about 30 carbon atoms or a substituted or unsubstituted aryl group of from 6 to about 12 carbon atoms, (b) R2 and R3 each independently represents hydrogen or R1; (c) E represents carbonyl or thiocarbonyl; (d) Q represents a nonmetallic atom of Group VA or VIA of the periodic table in its minus 2 or minus 3 valence state; and (e) Dye represents a diffusible dye moiety or precursor thereof; with the proviso that at least one of R1, R2 and R3 is an organic ballasting radical of such molecular size and configuration as to render the compound nondiffusible in a photographic element during development in an alkaline processing composition.
486601
Eastman Kodak Company
Gowling Lafleur Henderson Llp
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