Color-forming sulfonamidodiphenylamine dye precursor that produces phenazine dye
US4507479A · kind A · utility
2Cited by
7References
7Claims
0Family size
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Key dates
| Filing date | Sep 29, 1982 |
| Grant date | Mar 26, 1985 |
| Priority date | — |
| Expiry date | Sep 29, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/3244
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A color-forming sulfonamidodiphenylamine dye precursor has sulfonamido groups in the ortho position and para position in relation to the --NH-- moiety of the sulfonamidodiphenylamine and, in oxidized form, intramolecularly reacts to produce a sulfonamido-substituted phenazine dye. Such color-forming sulfonamidodiphenylamine dye precursors are useful to produce a dye image by cross-oxidation in an imaging material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.