Coupler for use in oxidative hair dyeing
US6540793B1 · kind B1 · utility
1Cited by
7References
20Claims
0Family size
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Key dates
| Filing date | Dec 7, 2000 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | Mar 27, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D307/54
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): wherein R is selected from the group consisting of C1 to C2 alkyl and hydroxyethyl; R1 is selected from the group consisting of a hydrogen, hydroxy, nitro, halogen, C1 to C5 alkyl or haloalkyl, C1 to C5 alkoxy or cycloalkoxy, C1 to C5 hydroxyalkyl and C1 to C5 hydroxyalkoxy; Ar is an aromatic group, preferably an aromatic group selected from the group consisting of a furyl, thienyl, pyridyl, phenyl, 2,3-dihydro-benzo[1,4]dioxin-5 or -6-yl or benzo[1,3]dioxol-4 or -5-yl group; and y=1 to 3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.