Dyeing composition for keratinous fibers comprising a particular dicationic diazo dye
US6893471B2 · kind B2 · utility
29Cited by
13References
40Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 11, 2002 |
| Grant date | May 17, 2005 |
| Priority date | — |
| Expiry date | Jun 11, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B44/20
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention concerns a dyeing composition for dyeing keratinous fibers, in particular human keratinous fibers and more particularly hair, comprising a dicationic diazo dye of formula W1—N═N—W2—N═N—W3 as well as the dyeing method using same and the novel compounds of formula (I).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.