Hydroxy benzamide thermal solvents
US5436109A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1993 |
| Grant date | Jul 25, 1995 |
| Priority date | — |
| Expiry date | Dec 29, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/156
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A process for forming an improved dye image in a heat-developable photographic dry dye-diffusion transfer element comprising the steps of: PA1 providing a heat-developable chromogenic photographic dry dye-diffusion transfer element comprising radiation sensitive silver halide, an organic silver salt, a heat-developable dye-forming compound wherein said compound forms or releases a heat-transferable dye upon reaction of said compound with the oxidation product of a reducing agent, a reducing agent, a hydrophilic binder, and a thermal solvent wherein said thermal solvent comprises a 3-hydroxy benzamide or a 4-hydroxy benzamide and has the structure I ##STR1## wherein (a) Z.sub.1, Z.sub.2, Z.sub.3, Z.sub.4, and Z.sub.5 are substituents, the Hammet sigma parameters of Z.sub.2, Z.sub.3, and Z.sub.4 sum to give a total, .SIGMA., of at least -0.28 and less than 1.53; PA1 (b) the calculated logP for I is greater than 3 and less than 10; PA1 exposing said dye-diffusion transfer element to actinic radiation; PA1 heating said dye-diffusion transfer element to develop a heat-diffusible dye image; PA1 providing a dye-receiving layer and contiguous dimensionally stable support where said dye-rec…
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