5,8-dihydroxy naphthalene-1,4-dione derivative and a hair dye composition containing the same
US4605419A · kind A · utility
1Cited by
4References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 19, 1985 |
| Grant date | Aug 12, 1986 |
| Priority date | — |
| Expiry date | Apr 19, 2005 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K8/355
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A naphthalene derivative having the general formula: ##STR1## wherein R represents hydrogen, an alkyl group having 1 to 8 carbon atoms, an R.sup.1 O (CH.sub.2).sub.n group, or a benzyl group, R.sup.1 represents hydrogen or a lower alkyl group, and n represents an integer of 2 or 3. This compound in the leuco state can be stably isolated and can produce a strong and fast color upon oxidation under moderate conditions. This compound can be advantageously included in a hair dye composition, which is capable of stably and safely dyeing hair with a good and stable color under moderate conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.