Use of hydroxynaphthoquinones for dyeing human keratin fibres
US4888026A · kind A · utility
4Cited by
3References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1984 |
| Grant date | Dec 19, 1989 |
| Priority date | — |
| Expiry date | Dec 28, 2004 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K2800/432
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The use in dyeing human keratin fibres, especially human hair, of 2-hydroxy-1,4-naphthoquinones of the formula: ##STR1## in which R.sub.1 denotes a hydrogen or halogen atom, or a hydroxy, alkoxy, nitro, alkyl or acyl group, and R.sub.2, R.sub.3, R.sub.4 and R.sub.5 independently of one another denote hydrogen or a hydroxyl, alkoxy, alkyl or acyl group, such that at least one of the substituents R.sub.1 to R.sub.5 is other than hydrogen, and if R.sub.1, R.sub.3 and R.sub.4 denote hydrogen, R.sub.2 and R.sub.5 cannot simultaneously denote hydroxyl is described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.