Photographic material and process comprising a coupler capable of forming a wash-out dye (Q/Q)
US5288593A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1992 |
| Grant date | Feb 22, 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.2 --T.sup.2 --INH wherein; PA1 X is selected from oxygen, nitrogen or sulfur; PA1 X--Rel.sup.2 contains a photographic ballast and is a releasing group for releasing T.sup.2 --INH from X--Rel.sup.2 by elimination electron transfer reaction during photographic processing without substantial delay of releasing; PA1 T.sup.2 is a timing group that releases INH by elimination electron transfer reaction with timing delay during photographic processing; PA1 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.