Patent ID: 6024769
Filing Date: 2000-02-15
Classification: A61K,A61Q

Abstract:
Process for dyeing keratinous fibres, consisting essentially of applying to the fibres a composition consisting essentially of, in a medium suitable for dyeing:(1) as a coupler at least one alkoxymetaphenylenediamine of formula (I): ##STR4## in which: R.sub.1 represents a C.sub.1 -C.sub.4 -alkyl radical, a C.sub.2 -C.sub.4 mono- or polyhydroxyalkyl radical, a C.sub.1 -C.sub.4 -carboxyalkyl radical or a C.sub.1 -C.sub.4 -aminoalkyl radical whose amino group may be mono- or disubstituted by a C.sub.1 -C.sub.4 -alkyl;R.sub.2 represents a hydrogen atom, a C.sub.1 -C.sub.4 -alkyl radical, a C.sub.2 -C.sub.4 mono- or polyhydroxyalkyl radical;R.sub.3 and R.sub.5, independently of each other, represent H or OR, R denoting a C.sub.1 -C.sub.4 -alkyl radical or a C.sub.2 -C.sub.4 mono- or polyhydroxyalkyl radical;R.sub.4 represents a hydrogen atom, a C.sub.1 -C.sub.4 -alkyl radical or NHR';R.sub.6 represents a hydrogen atom, a C.sub.1 -C.sub.4 -alkyl radical, OR or NHR', R having the meaning given above;R' denotes a hydrogen atom, a C.sub.1 -C.sub.4 -alkyl radical or a C.sub.2 -C.sub.4 mono- or polyhydroxyalkyl radical; provided that:a) one of the radicals R.sub.4 and R.sub.6 denotes NHR' and the other of the radicals R.sub.4 and R.sub.6 does not denote NHR';b) R.sub.3 and OR.sub.1 cannot simultaneously denote methoxy when R.sub.2, R.sub.5 and R.sub.6 simultaneously denote hydrogen and R.sub.4 a NH.sub.2 group;c) at least one of the radicals R.sub.3, R.sub.4, R.sub.5 or R.sub.6 denotes H;d) R.sub.3, R.sub.4 and R.sub.5 cannot simultaneously denote hydrogen when R.sub.6 denotes NH.sub.2, R.sub.2 denotes hydrogen and R.sub.1 denotes methyl;e) when R.sub.1 denotes ethyl and R.sub.2, R.sub.3, R.sub.5 and R.sub.6 denote hydrogen, R.sub.4 cannot denote NH.sub.2 ;f) R.sub.4 must represent NHR' when R.sub.1 denotes carboxyalkyl or aminoalkyl;g) if R.sub.4 represents NHR', R' cannot denote a C.sub.2 -C.sub.4 mono- or polyhydroxyalkyl radical;or salts of these compounds;(2) at least one oxidation dye precursor or oxidation base; and(3) at least one oxidizing agent;the pH of the composition applied to the fibres being less than 7.