Photographic element containing a DIR coupler
US6146820A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1998 |
| Grant date | Nov 14, 2000 |
| Priority date | — |
| Expiry date | Dec 11, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/158
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention comprises a photographic element having a support bearing at least one silver halide emulsion and at least one DIR coupler of structure I: ##STR1## wherein: Z is a moiety which can react with oxidized developer to release a coupling-off group; PA1 R.sub.1 is selected from the substituents shown in formulas II, III, IV and V: PA1 II --SCH.sub.2 CO.sub.2 R.sub.2, III --NHCOR.sub.3, IV --OCH.sub.2 CO.sub.2 R.sub.4, V --OR.sub.5 ; PA1 R.sub.2 is an alkyl group with at least 3 carbon atoms or an aryl group with at least 7 carbon atoms; PA1 R.sub.3 is an alkyl or alkoxy group with at least 4 carbon atoms or an aryl or phenoxy group with at least 7 carbon atoms; and PA1 R.sub.4 and R.sub.5 are alkyl groups with at least 4 carbon atoms or aryl groups.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.