Direct positive silver halide photographic light-sensitive material depress formation of re-reversed negative image
US4719174A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1986 |
| Grant date | Jan 12, 1988 |
| Priority date | — |
| Expiry date | Apr 2, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/48538
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A direct positive silver halide photographic light-sensitive material is described containing a weak electron donative, adsorptive compound represented by formula (I) or (II) effective for depressing formation of a re-reversed negative image, which is not a spectral sensitizing agent for silver halide or a nucleating agent: EQU D--L--X (I) EQU D--X (II) wherein PA0 D represents electron donative atoms comprising an aromatic ring or hereto ring, which is unsubstituted or substituted; PA0 L represents a linking group containing at least one of C, N, S and O and an atom or atoms necessary for cutting a .pi.-conjunction system; and PA0 X represents a group which is adsorptive with respect to silver halide and contains at least one of C, N, S, O and Se.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.