Photographic material and process comprising a coupler capable of forming a wash-out dye (C/C)
US5279929A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1992 |
| Grant date | Jan 18, 1994 |
| Priority date | — |
| Expiry date | Jun 24, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/158
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A photographic element comprises a support bearing at least one photographic silver halide emulsion layer and at least one coupler (A) having a water solubilizing group wherein coupler (A) forms a compound that is washed out of the photographic element during photographic processing and forms a coupling-off group represented by the formula: EQU --X--Rel.sup.3 --T.sup.3 --INH wherein; PA0 X is selected from oxygen, nitrogen or sulfur PA0 X--Rel.sup.3 contains a photographic ballast and is a releasing group for releasing T.sup.3 --INH from X--Rel.sup.3 by intramolecular displacement reaction during photographic processing without substantial delay of releasing; PA0 T.sup.3 is a timing group that releases INH by intramolecular displacement reaction with timing delay during photographic processing; PA0 INH is a development inhibitor group; The photographic coupler (A) enables formation of easily removable dyes in photographic elements and processes that provide images having improved acutance, stability and interimage effects.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.