Oxidants for reducing post-process D-min increase in positive redox dye-releasing image transfer systems
US4485164A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1983 |
| Grant date | Nov 27, 1984 |
| Priority date | — |
| Expiry date | Jul 6, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C8/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic elements and assemblages are described employing positive-working redox dye-releasers, wherein the element contains an oxidant which is located between the support and the photosensitive portion thereof. The oxidant has an electrode potential of from about -200 mV up to about 1200 mV versus a saturated calomel electrode at a pH of about 5 to about 6. After processing, the oxidant reacts with the electron transfer agent to prevent it from reacting with the dye releaser which would otherwise cause further dye release. The reduced form of the oxidant is then substantially incapable of reducing the positive-working redox dye-releaser. D.sub.min stability is thereby improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.