Heat development of elements containing methine-dye releasing couplers
US5470688A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 1994 |
| Grant date | Nov 28, 1995 |
| Priority date | — |
| Expiry date | May 27, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/159
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In accordance with this invention a heat-developable photographic color diffusion transfer element is provided, where this element comprises a dimensionally stable support and one or more layers comprising radiation sensitive silver halide, an organic silver salt oxidizing agent, a reducing agent, a methine-dye releasing compound, and a binder, wherein said methine-dye is heat diffusible in said element, and wherein said methine-dye releasing compound is of the structure EQU Cp--L--M (I) where PA1 Cp is a coupler radical substituted in the coupling position with a divalent linking group, L; PA1 M is a methine-dye radical exhibiting selective absorption in the visible spectrum; and where the --L--M group couples off upon reaction of said coupler radical with the oxidation product of a primary amine developing agent, and where said methine-dye radical M is released from said --L--M group subsequent to the coupling off of said --L--M group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.