Dye releasing couplers for heat image separation systems
US5356750A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1992 |
| Grant date | Oct 18, 1994 |
| Priority date | — |
| Expiry date | Dec 21, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C8/4066
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An aqueous-developable photographic color diffusion transfer element comprising a single dimensionally stable support and one or more layers comprising radiation sensitive silver halide, thermal solvent for facilitating the thermal diffusion of dyes through a hydrophilic binder, a dye-releasing coupler, and hydrophilic binder, wherein said dye is heat diffusible in said binder and thermal solvent, and wherein said dye-releasing coupler is of the structure EQU Cp--L-Dye where Cp is a cyan dye forming radical, magenta dye forming radical, yellow dye forming radical, black dye forming radical, or colorless product forming radical, said Cp being substituted in the coupling position with a divalent linking group, L; Dye is a dye radical exhibiting selective absorption in the visible spectrum; and where said --L-Dye group couples off upon reaction of said coupler radical with the oxidation product of a primary amine developing agent is disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.