Dyeing compositions for keratinous fibres based on para-phenylene-diamines, meta-phenylenediamine and benzimidazole derivatives, and dyeing process employing them
US5578087A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1995 |
| Grant date | Nov 26, 1996 |
| Priority date | — |
| Expiry date | Jun 5, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K8/4946
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Processes for the oxidative dyeing of keratinus fibers with compositions which comprise benzimidazole derivatives as couplers, at least one metaphenylenediaxnine and at least one para or ortho oxidation dye precursor, the benzimidazole derivative corresponding to the formula: ##STR1## in which: R.sub.1 represents a hydrogen atom or a C.sub.1 -C.sub.4 alkyl radical; PA1 R.sub.2 represents a hydrogen atom or a C.sub.1 -C.sub.4 alkyl radical or a phenyl radical; PA1 R.sub.3 represents a hydroxyl, amino or methoxy radical; PA1 R.sub.4 represents a hydrogen atom or a hydroxyl or methoxy or C.sub.1 -C.sub.4 alkyl radical; PA1 with the proviso that: PA2 when R.sub.3 denotes NH.sub.2, it occupies position 4; PA2 when R.sub.3 is at position 4, R.sub.4 is at position 7; PA2 when R.sub.3 is at position 5, then R.sub.4 is at position 6.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.