Patent ID: 7101406

Claim:
A dyeing composition for dyeing keratinous fibres comprising, in an appropriate dyeing medium, at least one cationic tertiary para-phenylenediamine comprising a pyrrolidine ring, and a dicationic diazo dye of general formula Vb W 7 —N═N—W 8 —N═N—W 9 (Vb) in which W 7 and W 9 represent independently of each other a heteroaromatic radical represented by formulae (C) and (D) below: W 8 represents a carbon-based aromatic, pyridine or pyridazinyl group of formula (E) in which formulae (C), (D), (E): X″ 1 represents a nitrogen atom or a radical CR″ 5 X″ 2 represents a nitrogen atom or a radical CR″ 6 Z″ 1 represents an oxygen or sulphur atom or a radical NR″ 8 , Z″ 2 represents a nitrogen atom or a radical CR″ 9 , Z″ 3 represents a nitrogen atom or a radical CR″ 12 , Z″ 4 represents a nitrogen atom or a radical CR″ 13 , the bond a of the 5-membered cationic ring of formula (C) is linked to the azo group of formula (Vb), the bond b of the 6-membered cationic ring of formula (D) is linked to the azo group of formula (Vb) R″ 3 , R″ 4 , R″ 5 , R″ 6 , R″ 7 , R″ 9 , R″ 10 , R″ 11 , R″ 12 and R″ 13 , represent, together or independently of each other, a hydrogen atom, a linear or branched, saturated or unsaturated C 1 –C 16 hydrocarbon-based chain, which can form one or more 3- to 6-membered carbon-based rings, one or more carbon atoms of the carbon-based chain of which may be replaced with an oxygen, nitrogen or sulphur atom or with an SO 2 group, and the carbon atoms of which may be, independently of each other, substituted with one or more halogen atoms; R″ 3 , R″ 4 , R″ 5 , R″ 6 , R″ 7 , R″ 9 , R″ 10 , R″ 11 , R″ 12 and R″ 13 not comprising a peroxide bond or diazo or nitroso radicals, R″ 7 with R″ 9 , R″ 10 with R″ 11 and R″ 12 with R″ 13 can form a carbon-based aromatic ring, such as a phenyl, X″ is an organic or mineral anion; and wherein said cationic tertiary paraphenylenediamine containing a pyrrolidine ring corresponds to formula I: in which n varies from 0 to 4, it being understood that when n is greater than or equal to 2, then the radicals R 1 may be identical or different, R 1 represents a halogen atom; a saturated or unsaturated, aliphatic or alicylic, C 1 –C 6 hydrocarbon chain, it being possible for the chain to contain one or more oxygen, nitrogen, silicon or sulphur atoms or an SO 2 group, and it being possible for the chain to be substituted with one or more hydroxyl or amino radicals; an onium radical Z, the radical R 1 not containing a peroxide bond, or diazo, nitro or nitroso radicals, R 2 represents an onium radical Z or a radical —X—C═NR 8 —NR 9 R 10 in which X represents an oxygen atom or a radical —NR 11 and R 8 , R 9 , R 10 and R 11 represent a hydrogen atom, a C 1 –C 4 alkyl radical or a C 1 –C 4 hydroxyalkyl radical, R 3 represents a hydrogen atom or a hydroxyl radical.