Dyeing process employing indole dyes and oxidation dye precursors and dyeing agents employed
US5073174A · kind A · utility
15Cited by
1References
19Claims
0Family size
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Key dates
| Filing date | Jul 20, 1990 |
| Grant date | Dec 17, 1991 |
| Priority date | — |
| Expiry date | Jul 20, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q5/10
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A process for dyeing keratinous fibers comprises a two-step operation in which in the first step the fibers are contacted with an indole dye in a medium suitable for dyeing the fibers, the medium being free from any oxidation catalyst and oxidation catalyst. Thereafter, in the second step the fibers are contacted with a para type oxidation dye precursor in a medium which is also suitable for dyeing the fibers and is free from any oxidation catalyst and oxidation agent. A multi-compartment kit housing the indole dye and para type oxidation dye precursor is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.