2,4-Diamino-1,3,5-trimethoxybenzene, process for its preparation and its use as a coupler in oxidation dyes for keratinous fibres
US4891045A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1988 |
| Grant date | Jan 2, 1990 |
| Priority date | — |
| Expiry date | Apr 27, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K8/411
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The invention relates to 2,4-diamino-1,3,5-trimethoxybenzene, a process for its preparation by catalytic reduction of 2,4-dinitro-1,3,5-trimethoxybenzene, and to its use, as a coupler, in combination with at least one oxidation dye precursor of the para type, for dyeing keratinous fibres and particularly human hair. The hair dyeing compositions according to the invention contain, in a cosmetically acceptable aqueous substrate, 0.05 to 3.5% by weight of 2,4-diamino-1,3,5-trimethoxybenzene or one of its salts, which imparts strong blue colors to hair when it is combined with p-phenylenediamines, or red colors when it is combined with p-aminophenols, in an alkaline oxidizing medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.