Photographic elements and processes utilizing imagewise reduction of ferric ions
US4568633A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 2, 1985 |
| Grant date | Feb 4, 1986 |
| Priority date | — |
| Expiry date | Jan 2, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/40
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A process for obtaining highly stable color photographic images utilizes a silver halide photographic element comprising an essentially colorless, immobile compound which is capable of complexing with ferrous ions to form a dye. The complexing compound contains a complexing moiety which is represented by the formula: ##STR1## wherein m is zero or a positive integer 1 to 3, n and p are independently 0 or 1 and represents a single or double bond. Z is R.sup.1 --N.dbd., O.dbd., S.dbd., R.sup.1 --P.dbd., (R.sup.1).sub.2 P-- or (R.sup.1).sub.3 P.dbd., and when Z is (R.sup.1).sub.2 P--, n is 1, otherwise n is 0. R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are independently hydrogen, amino, hydroxy, mercapto, alkoxy, alkyl, aryl or a heterocyclic moiety. When R.sup.6 is so defined, p is 1 and is a single bond. If m is 0, R.sup.1 and R.sup.2, R.sup.2 and R.sup.3, and R.sup.3 and R.sup.4 taken together can independently represent the carbon and heteroatoms necessary to complete a substituted or unsubstituted carbocyclic or heterocyclic nucleus, or if m is 1 to 3, R.sup.1 and R.sup.2, R.sup.5 and R.sup.6, and R.sup.3 and R.sup.4 can independently represent the carbon and heteroat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.