Fragmentable electron donor compounds used in conjunction with epitaxially sensitized silver halide emulsions
US6342341B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1999 |
| Grant date | Jan 29, 2002 |
| Priority date | — |
| Expiry date | Dec 20, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/24
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention comprises a silver halide photographic element comprising at least one sensitive silver halide emulsion layer comprising silver halide grains that have been epitaxially sensitized and a fragmentable electron donor compound is of the formula X—Y′ or a compound which contains a moiety of the formula —X—Y′;whereinX is an electron donor moiety, Y′ is a leaving proton H or a leaving group Y, with the proviso that if Y′ is a proton, a base, &bgr;−, is covalently linked directly or indirectly to X, and wherein:1) X—Y′ has an oxidation potential between 0 and about 1.4 V; and2) the oxidized form of X—Y′ undergoes a bond cleavage reaction to give the radical X• and the leaving fragment Y′;and, optionally,3) the radical X• has an oxidation potential ≦−0.7V (that is, equal to or more negative than about −0.7V).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.