Use of zinc salts to increase dye stability
US4356250A · kind A · utility
8Cited by
6References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1981 |
| Grant date | Oct 26, 1982 |
| Priority date | — |
| Expiry date | Jan 12, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C8/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic elements, diffusion transfer assemblages and processes are described which employ redox dye-releasing materials and a zinc salt, such as zinc oxide, in such a form, location and concentration that it will be diffusible in the element during processing, and the dye which is released from the redox dye-releasing material during processing will have an increased stability to light exposure. The zinc salts may be incorporated in the photosensitive portion of a photosensitive element, a processing composition or a cover sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.