Method for the formation of direct positive color images
US4966833A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 5, 1988 |
| Grant date | Oct 30, 1990 |
| Priority date | — |
| Expiry date | Oct 5, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/48546
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for the formation of direct positive color images wherein after image-wise exposure of a direct positive color photosensitive material which comprises at least one internal latent image type silver halide emulsion layer which has not been pre-fogged and color image forming couplers on a support, the material is subjected to development after and/or during a fogging process, the development process being carried out using a development bath which contains at least one N-hydroxylalkyl substituted p-phenylenediamine derivative in the presence of at least one compound of general formula [I] and/or [II] as indicated below: ##STR1## wherein Q represents the group of atoms required to form a five- or six-membered heterocyclic ring, which heterocyclic ring may be condensed with a carbon aromatic ring or a heterocyclic aromatic ring, PA0 Y represents a divalent linking group consisting of at least one atom selected from the group consisting of, carbon atom, nitrogen atom, oxygen atom, sulfur atom, and R represents an organic group which includes at least one thioether group, amino group, ammonium group, ether group or heterocyclic group, n represents 0 or 1, m represents 0, 1 or 2,…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.