Dye image forming process
US4209328A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 22, 1977 |
| Grant date | Jun 24, 1980 |
| Priority date | — |
| Expiry date | Jun 22, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C8/18
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
In a dye image forming process in color photography comprising imagewise exposing a photographic element comprising a support and a light sensitive silver halide emulsion layer, and processing the exposed photographic element with an alkaline processing solution in the presence of a dye developer whereby a dye image corresponding to the imagewise exposure is formed by oxidation of said developer as a function of development of silver halide, the improvement which comprises the dye developer being a mono azo dye developer represented by the following formula: EQU X--N.dbd.N--Y--NH--Z wherein X represents a monovalent group selected from an aromatic group, a non-aromatic-heterocyclic active-methylene-containing group, a non-aromatic-heterocyclic active-methyne-containing group, an aliphatic active-methylene-containing group, and an aliphatic active-methyne-containing group; and Y and Z respectively represent divalent and monovalent groups of an aromatic group, at least one of the X, Y and Z has therein at least one of the developer groups which are either capable of developing silver halide or changeable to a group capable of developing silver halide, the azo radical (--N=N--) and th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.