| 摘要 |
<p>- O NAPHTHOQUINONE REDOX DYE-RELEASERS Photographic elements and diffusion transfer assemblages are described which employ a nondiffusible, positive-working, redox dye-releaser having the formula: 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.</p> |
