p-phenylenediamines, process for preparation thereof, dyeing composition containing them and corresponding dyeing process
US4979961A · kind A · utility
7Cited by
0References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1989 |
| Grant date | Dec 25, 1990 |
| Priority date | — |
| Expiry date | Apr 24, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C323/25
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The invention relates to p-phenylenediamines of formula: ##STR1## in which R.sub.1 denotes an alkyl, hydroxyalkyl or polyhydroxyalkyl radical and R.sub.2 denotes a hydrogen atom or an alkyl radical, as well as the corresponding salts with acids, and to the compositions and the process for dyeing keratinous fibers, especially hair, employing them.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.