3-substituted para-aminophenols and use thereof in dyeing keratinous fibers
US5984975A · kind A · utility
4Cited by
24References
16Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 4, 1997 |
| Grant date | Nov 16, 1999 |
| Priority date | — |
| Expiry date | Jun 4, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/54
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A method or composition for dyeing keratinous fibres using as an oxidation dye precursor a 3-substituted para-aminophenol of formula: ##STR1## where R.sub.1 represents alkyl, alkenyl, mono- or polyhydroxyalkyl, cyano, cyanoalkyl, halogenoalkyl, aminoalkyl or alkoxyalkyl and R.sub.2 represents hydrogen, alkyl or mono- or polyhydroxyalkyl, provided that when R.sub.2 is hydrogen R.sub.1 is not methyl or trifluoromethyl, and addition salts thereof with an acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.