Photographic element containing a DIR coupler
US6171771A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1997 |
| Grant date | Jan 9, 2001 |
| Priority date | — |
| Expiry date | Mar 25, 2017 |
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 one or more silver halide emulsions and one or more DIR couplers of structure I or II below: ##STR1## wherein: PA1 Z is a moiety which can react with oxidized developer to release a coupling-off group; PA1 R.sub.1 is a hydrogen atom or a substituent selected from the group consisting of halogen atom, alkyl, aryl, alkoxy, alkylthio, arylthio, amino, alkylamino, arylamino, carbonamido, carbamoyl, alkoxycarbonyl, aryloxycarbonyl, aryloxy, arylcarbonyl, alkylcarbonyl, sulphonyl and sulphonamido groups; PA1 each of the R.sub.2 substituents is a halogen atom or a substituent selected from the group consisting of alkyl, aryl, alkoxy, alkylthio, arylthio, amino, alkylamino, arylamino, carbonamido, carbamoyl, alkoxycarbonyl, aryloxycarbonyl, aryloxy, arylcarbonyl, alkylcarbonyl, sulphonyl and sulphonamido groups; PA1 X represents the atoms required to make a second ring which is aromatic and contains at least one nitrogen atom; and PA1 n is between 0 and the number of carbon atoms in the second ring, with the proviso that if R.sub.1 is hydrogen, n is at least 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.