SUBSTITUTED 2-NITROMETAPHENYLENE-DIAMINES, A PROCESS FOR THEIR PREPARATION AND THEIR USE IN DYEING KERETINIC FIBERS, PARTICULARLY HUMAN HAIR

摘要

SHORT DESCRIPTION The invention relates to novel 2-nitro substituted meta-phenylenediamines of formula: (I) wherein Z denotes -O-, -S- or -NH- and R1, R2 and R3, identical or different, denote a hydrogen atom or an alkyl, hydroxyalkyl, polyhydroxyalkyl, alkoxyalkyl, hydroxyalkoxyalkyl or aminoalkyl whose amino group may be mono or disubstituted by an alkyl or hydroxyalkyl radical, the alkyl and alkoxy radicals having 1 to 6 carbon atoms, and cosmetically acceptable salts and their preparation method. These compounds are used in dyeing keratinous fibers, especially human hair, and possible to obtain hair dye having a very good stability to light, washing and weathering.