Photographic element containing pyrazoloazole coupler and oxidized developer competitor
US5164288A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 1990 |
| Grant date | Nov 17, 1992 |
| Priority date | — |
| Expiry date | May 29, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/39236
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic elements are described having PA1 a silver halide emulsion layer, PA1 a pyrazoloazole coupler in reactive association with said silver halide emulsion, and PA1 a competitor for oxidized developer in reactive association with said coupler having the formula: ##STR1## R.sup.1 represents an electron donating group, R.sup.2 represents hydrogen, alkyl, alkoxy, aryl, aryloxy, aralkyl or amino of the formula --NHR.sup.3, where R.sup.3 is phenyl or benzyl, with the proviso that at least one of the substituents R.sup.1 and R.sup.2 (a) represents a ballast group of sufficient size as to render the hydrazide compound non-diffusible in the photographic element prior to developement in alkaline processing solution and (b) comprises a polar group, and PA2 n is 0, 1 or 2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.