Color photographic element containing speed improving compound in combination with reflecting material
US6350564B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 2000 |
| Grant date | Feb 26, 2002 |
| Priority date | — |
| Expiry date | Oct 17, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2007/3034
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is a color silver halide photographic element comprising a support bearing:(1) a light sensitive silver halide emulsion layer;(2) a nitrogen heterocycle with a minimum of three heteroatoms that does not react with oxidized developer, does not contain free thiol substituents, and has a ClogP sufficient to increase the photographic speed of said element compared to the same element without the compound, said heterocycle compound located either in said light sensitive layer or in a layer adjacent to it; and(3) a light reflecting silver halide material;provided that the heterocycle compound and the light reflecting material are located either (a) in different layers of the element located close enough to each other so that a super-additive speed increase is realized or (b) in the same light sensitive layer. The invention provides improved light sensitivity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.