Photothermographic element with pre-formed iridium-doped silver halide grains
US5434043A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 1994 |
| Grant date | Jul 18, 1995 |
| Priority date | — |
| Expiry date | May 9, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/145
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A negative-acting photothermographic element comprising a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer comprising: PA0 (a) an iridium doped, preferably iridium-doped core-shell, photosensitive silver halide grains, generally containing a total silver iodide content of less than 10 mole %, the shell having a second silver iodide content lower than the silver iodide content of the core; PA0 (b) a non-photosensitive, reducible source of silver; PA0 (c) a reducing agent for the non-photosensitive, reducible source of silver; PA0 (d) a binder; and PA0 (e) optionally at least one compound selected from the group consisting of: a halogen molecule; an organic haloamide; and hydrobromic acid salts of nitrogen-containing heterocyclic compounds which are further associated with a pair of bromine atoms. A process of forming photothermographic emulsions from iridium-doped silver halide grains by forming silver soaps in the presence of those grains is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.