Sensitive silver halide photothermographic materials for producing dye images
US4504568A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1984 |
| Grant date | Mar 12, 1985 |
| Priority date | — |
| Expiry date | Feb 2, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/49854
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A dye-forming photothermographic element comprises in a binder, in reactive association, PA1 (a) photographic silver halide, PA1 (b) an image forming combination comprising PA2 (i) a reducible organic silver salt with PA2 (ii) a reducing agent selected from the group consisting of p-phenylenediamine, p-aminophenol, sulfonamidophenol, sulfonamidoaniline and hydrazone developing agents, and PA1 (c) a coupler which is capable of forming an image dye by reaction with the oxidized form of the reducing agent. In such a photothermographic element improvements are provided wherein the coupler has attached to the carbon atom at the coupling position either (A) a group --S--Dye, wherein Dye represents an image dye, or a blocked or shifted form thereof, and any necessary linking group, or (B) a moiety --S--Z, wherein Z represents atoms linking the sulfur atom to another position in the coupler. The exposed dye-forming photothermographic element is capable of forming a dye image by merely heating the element. The dye-forming photothermographic element can be a diffusion transfer photothermographic element in which the image dye formed upon heating the exposed element is capable of being transf…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.