Patent ID: 6093220
Filing Date: 2000-07-25
Classification: A61K,A61Q

Abstract:
A composition for the oxidation dyeing of keratin fibres comprising, in a medium which is suitable for dyeing:at least one first coupler wherein said first coupler is 2-amino-3-hydroxypyridine or an acid addition salt thereof,at least one oxidation base wherein said oxidation base is(i) a para-phenylenediamine of formula (I) below or an acid addition salt thereof: ##STR5## wherein: R.sub.1 represents a hydrogen atom or a C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 monohydroxyalkyl, C.sub.2 -C.sub.4 polyhydroxyalkyl, alkoxy(C.sub.1 -C.sub.4)alkyl, phenyl or 4'-aminophenyl radical,R.sub.2 represents a hydrogen atom or a C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 monohydroxyalkyl or C.sub.2 -C.sub.4 polyhydroxyalkyl radical,R.sub.3 represents a hydrogen atom, a halogen atom, or a C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 monohydroxyalkyl or C.sub.1 -C.sub.4 hydroxyalkoxy radical,R.sub.4 represents a hydrogen atom or a C.sub.1 -C.sub.4 alkyl radical,with the proviso that:when R.sub.2 represents a .beta.-hydroxyethyl radical and when R.sub.1 and R.sub.4 represent a hydrogen atom, then R.sub.3 is other than a methyl radical,when R.sub.2 represents a .beta.-hydroxyethyl radical and when R.sub.1 and R.sub.3 represent a hydrogen atom, then R.sub.4 cannot represent a methyl radical in position 6, or(ii) a para-aminophenol of formula (II) below or an acid addition salt thereof: ##STR6## wherein: R.sub.5 represents a hydrogen atom or a C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 monohydroxyalkyl, alkoxy(C.sub.1 -C.sub.4)alkyl or C.sub.1 -C.sub.4 aminoalkyl radical,R.sub.6 represents a hydrogen or fluorine atom or a C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 monohydroxyalkyl, C.sub.2 -C.sub.4 polyhydroxyalkyl, C.sub.1 -C.sub.4 aminoalkyl, cyano(C.sub.1 -C.sub.4)alkyl or alkoxy(C.sub.1 -C.sub.4)alkyl radical, with the proviso that at least one of the radicals R.sub.5 or R.sub.6 represents a hydrogen atom, andat least one second coupler wherein said second coupler is a meta-aminophenol of formula (III) below or an acid addition salt thereof: ##STR7## wherein: R.sub.7 represents a hydrogen atom or a C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 monohydroxyalkyl or C.sub.2 -C.sub.4 polyhydroxyalkyl radical,R.sub.8 represents a hydrogen atom, a C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 alkoxy radical or a halogen atom wherein said halogen is chlorine, bromine or fluorine, andR.sub.9 represents a hydrogen atom or a C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.1 -C.sub.4 monohydroxyalkyl, C.sub.2 -C.sub.4 polyhydroxyalkyl, C.sub.1 -C.sub.4 monohydroxyalkoxy or C.sub.2 -C.sub.4 polyhydroxyalkoxy radical,wherein at least one of the radicals R.sub.7, R.sub.8 and R.sub.9 is other than a hydrogen atom.