Photographic element, compound, and process
US6197491A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1999 |
| Grant date | Mar 6, 2001 |
| Priority date | — |
| Expiry date | Dec 28, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/346
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is a photographic element comprising a light-sensitive silver halide emulsion layer having associated therewith a "NB coupler" having the formula (I): ##STR1## wherein: PA1 the term "NB coupler" represents a coupler of formula (I) that forms a dye for which the left bandwidth (LBW) using spin-coating is at least 5 nm less than that of the same dye in solution form; PA1 Y is H or a coupling-off group; PA1 each Z* is an independently selected substituent group where p is 0 to 2; PA1 V is a substituent group containing a sulfonamido group; PA1 R.sub.4 is hydrogen or a group bonded to the carbonamido group by an aliphatic carbon atom; PA1 provided that the combined sum of the aliphatic carbon atoms in V, R.sub.4 and all Z* is at least 8. The element provides a dye of improved hue.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.