Photographic element containing an improved pyrozolotriazole coupler
US5985532A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 1996 |
| Grant date | Nov 16, 1999 |
| Priority date | — |
| Expiry date | Oct 4, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/3212
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention provides a photographic element comprising a light sensitive silver halide emulsion layer having associated therewith a dye-forming coupler having formula I: ##STR1## wherein R.sub.1 is selected from the group consisting of alkyl, aryl, and heterocyclic groups; PA1 R.sub.2 is selected from the group consisting of hydrogen, alkyl, aryl, and heterocyclic groups; PA1 W is C(O) or S(O).sub.2 ; PA1 R.sub.3 is selected from the group consisting of alkyl, alkoxy, aryl, aryloxy, and amino groups; PA1 each R.sub.4 is independently selected from the group consisting of alkyl, alkoxy, aryl, aryloxy, and alkylamino groups, and n is an integer from 1 to 4; PA1 Y is a substituent; and PA1 X is H or a coupling-off group; PA1 provided that the number of carbon atoms contained in R.sub.1, R.sub.2, R.sub.3 and R.sub.4 combined is at least 18 and provided further that any two or more of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 may be joined to form a ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.