Photographic products and processes employing novel nondiffusible heterocyclyazonaphthol dye-releasing compounds
US4204870A · kind A · utility
19Cited by
2References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 9, 1979 |
| Grant date | May 27, 1980 |
| Priority date | — |
| Expiry date | Jan 9, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C8/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic elements, diffusion transfer assemblages and processes are described which employ a novel nondiffusible compound having a releasable 2-(2-heterocyclylazo)-1-naphthol dye moiety which contains a nitrogen atom adjacent to the point of attachment to the azo linkage. The compound contains a ballasted carrier moiety which is capable of releasing the diffusible azo dye under alkaline conditions. The dye is transferred imagewise to an image-receiving layer where it is contacted with metal ions to form a metal-complexed azo dye transfer image of excellent stability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.