Chromogenic leuco redox-dye-releasing compounds for photothermographic elements
US5705676A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1995 |
| Grant date | Jan 6, 1998 |
| Priority date | — |
| Expiry date | Nov 16, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/156
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A photothermographic element comprising a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer comprising: PA1 (a) a photosensitive silver halide; PA1 (b) a non-photosensitive, reducible source of silver; PA1 (c) a chromogenic leuco dye reducing agent; and PA1 (d) a binder; PA1 wherein the chromogenic leuco dye reducing agent is a chromogenic leuco redox-dye-releasing compound of the general formula: ##STR1## wherein: (i) Cp is a coupler group; PA2 (ii) N--D is a photographic developer group; and PA2 (iii) R.sup.1 is a --C(O)--NH--A--Dye group wherein Dye represents the chromophore of a thermally mobile dye; and A represents a single bond or a divalent linking group of the formula --X--R.sup.5 --L--, wherein R.sup.5 is a divalent hydrocarbon chain containing up to 12 carbon atoms, L is a single bond or a divalent group that binds the chromophore of the thermally mobile dye to R.sup.5, and X represents a single bond or an --SO.sub.2 -- group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.