Photographic elements containing magenta couplers and process for using same
US5350667A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1993 |
| Grant date | Sep 27, 1994 |
| Priority date | — |
| Expiry date | Jun 17, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/384
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic element contains a light-sensitive silver halide layer having associated therewith a coupler which is a pyrazolone compound with a coupling-off substituent at the -4-position, said compound having the formula: ##STR1## wherein each R.sup.1 is independently a substituted or unsubstituted alkylsulfonyl or arylsulfonyl group; each R.sup.2 and R.sup.3 is independently a substituent; R.sup.4, R.sup.5, and R.sup.6 are independently hydrogen or substituted or unsubstituted alkyl groups; m and n are independently 0 or 1 but both are not 0; x1 and x2 are independently 0 to 5; and y is 0 to 3; provided that each of R.sup.3, R.sup.4, R.sup.5, and R.sup.6 is selected such that the calculated log P of the thiophenol corresponding to the substituent at the 4-position of the pyrazolone is at least 4. The photographic element provides an improved combination of low continued coupling together with a magenta hue exhibiting a long wavelength of maximum absorption.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.