Photographic elements containing blend of cyan dye-forming couplers
US6261755A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2000 |
| Grant date | Jul 17, 2001 |
| Priority date | — |
| Expiry date | Feb 28, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/39256
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention provides a photographic element comprising at least one light-sensitive silver halide emulsion layer having associated therewith: PA1 (A) a phenolic cyan dye-forming narrow bandwidth "NB coupler"; PA1 (B) a phenolic cyan dye-forming coupler of formula (II): ##STR1## wherein: PA1 R.sub.3 is an unsubstituted or substituted alkyl or aryl group or a 5-10 membered heterocyclic ring which contains one or more heteroatoms selected from nitrogen, oxygen and sulfur, which ring is unsubstituted or substituted; PA1 R.sub.4 is an unsubstituted or substituted alkyl group; PA1 R.sub.5 is hydrogen, halogen or an unsubstituted or substituted alkyl or aryl group or a 5-10 membered heterocyclic ring which contains one or more heteroatoms selected from nitrogen, oxygen and sulfur, which ring is unsubstituted or substituted; and PA1 Z is a hydrogen atom or a group which can be split off by the reaction of the coupler with an oxidized color-developing agent; and PA1 (C) a stabilizer of formula (III) ##STR2## wherein: PA1 each Y is an independently selected substituent and m is 0 to 4; and PA1 each T is an independently selected substituent and p is 0 to 4. Preferably the element has assoc…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.