Photographic elements containing color-forming couplers having a

Details Photographic elements containing color-forming couplers having a Photographic elements containing color-forming couplers having a

1978-06-16

1980-02-12

Brown, J. Travis

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Two or more radiation-sensitive layers containing other than...

430556, G03C 176, G03C 140

Patent

active

RE0302112

ABSTRACT:
Color photographic elements containing silver halide and incorporated color-forming materials are described. These elements contain at least two differentially light-sensitive emulsion layers, the overlying layer being sensitive to the relatively shorter wavelengths and containing at least one yellow dye-forming color coupler which has the unusual ability to inhibit the reaction of competing couplers (such as citrazinic acid, for example) when competing couplers are used in color developing solutions in the conventional manner. Use of these couplers in the overlying (color) layer of multi-layer color photographic elements makes it possible to produce colored images having improved graininess.
Couplers having this unusual capability are selected from those having the [structures] structure ##STR1## wherein R.sub.1, and R.sub.2 [and R.sub.3 ] are as defined herein.

REFERENCES:
patent: 3265506 (1966-08-01), Weissberger et al.
patent: 3408194 (1968-10-01), Loria
patent: 3647452 (1972-03-01), Hendess et al.
patent: 3770446 (1973-11-01), Sato et al.
patent: 3816121 (1974-06-01), Shiba et al.

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