Color-forming sulfonamidodiphenylamine dye precursor that produces phenazine dye
US4380666A · kind A · utility
3Cited by
7References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Jul 6, 1981 |
| Grant date | Apr 19, 1983 |
| Priority date | — |
| Expiry date | Jul 6, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/3244
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A color-forming para sulfonamidodiphenylamine dye precursor has one or two sulfonamido groups in positions ortho to the amine --NH-- moiety separating the two phenyl rings of the para sulfonamidodiphenylamine and, in oxidized form, intramolecularly reacts to produce a sulfonamido-substituted phenazine dye. Such color-forming para 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.