Process for dyeing keratin fibres with a monohydroxyindole associated with an iodide and hydrogen peroxide
US5034015A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1989 |
| Grant date | Jul 23, 1991 |
| Priority date | — |
| Expiry date | Sep 8, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K8/492
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Process for dyeing keratin fibres consisting in applying on these fibres a composition (A) containing at least one indole colorant of formula: ##STR1## where R.sub.1 =H or C.sub.1 -C.sub.4 alkyl; PA0 R.sub.2 and R.sub.3, which may be identical or different, denote H, C.sub.1 -C.sub.4 alkyl, carboxyl or alkoxycarbonyl; or a salt or a precursor of a compound (I), associated, either with iodide ions, or with H.sub.2 O.sub.2 ; application of composition (A) being preceded or followed by the application of a compound (B) which contains, either H.sub.2 O.sub.2 at a pH of 2 to 12 when (A) contains iodide ions, or iodide ions at a pH of 2 to 11 when (A) contains H.sub.2 O.sub.2. This process allows particularly powerful and resistant dyes to be made.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.