Dissymmetrical diazo compounds comprising 2-pyridinium group and a cationic or non-cationic linker, compositions comprising them, method for coloring, and device
US7438728B2 · kind B2 · utility
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40Claims
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Key dates
| Filing date | Dec 15, 2005 |
| Grant date | Oct 21, 2008 |
| Priority date | — |
| Expiry date | Sep 28, 2026 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q5/065
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Disclosed herein are dissymmetrical cationic diazo compounds comprising a 2-pyridinium group and a cationic or non-cationic linker. Also disclosed herein are dyeing compositions comprising such compounds as a direct dye in a medium appropriate for the dyeing of keratin fibers, a method for coloring keratin fibers comprising contacting the keratin fibers with such dyeing compositions, and a device comprising a plurality of compartments.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.