| 摘要 |
<p>A photographic element is described which employs a nondiffusible, positive-working, redox dye-releaser having the formula:
<CHEM>
wherein:
(a) R<1> represents a substituted or unsubstituted alkyl group of from 1 to 30 carbon atoms or a substituted or unsubstituted aryl group of from 6 to 12 carbon atoms,
(b) R<2> and R<3> each independently represents hydrogen or R<1>;
(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 R<1>, R<2> and R<3> 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> |
