Color diffusion transfer photographic film unit
US5316888A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1993 |
| Grant date | May 31, 1994 |
| Priority date | — |
| Expiry date | Apr 21, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C8/26
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is a color diffusion transfer photographic film unit improved in separability and light fastness. It comprises (1) a light sensitive sheet having an image receiving layer, a white reflective layer, a shading layer and at least one silver halide emulsion layer having at least one dye image forming substance, which layers are formed on a transparent support, (2) a transparent cover sheet comprising a neutralization layer and a neutralization timing layer, which layers are formed on a transparent support, and (3) a shading alkali treating composition developed between the light sensitive sheet and the transparent cover sheet. Further, the image receiving layer contains a hydrazine derivative represented by the following general formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each independently represent a substituted or unsubstituted alkyl, cycloalkyl, alkenyl or aralkyl group and may combine with one another to form a ring, provided that this ring is a non-aromatic heterocyclic group and that all atoms belonging to R.sub.1, R.sub.2, R.sub.3 and R.sub.4 and constituting the ring are carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.