Patent ID: 7044987

Claim:
A dye composition comprising, in a medium that is suitable for dyeing: at least one oxidation base, and at least one 6-alkoxy-2,3-diaminopyridine coupler of formula (I), and the addition salts thereof: wherein: R 4 is chosen from linear and branched C 1 –C 4 alkyl radicals optionally substituted with at least one radical chosen from hydroxyl, C 1 –C 2 alkoxy, and NR 7 R 8 radicals wherein R 7 and R 8 are chosen from hydrogen, C 1 –C 4 alkyl, C 2 –C 6 (poly)hydroxyalkyl, C 2 –C 6 (poly)aminoalkyl, and C 2 –C 6 aminohydroxyalkyl radicals; and R 5 is chosen from linear and branched C 1 –C 6 alkyl radicals substituted with at least one radical chosen from C 1 –C 2 alkoxy, hydroxyl, carboxyl, sulphonic (—SO 3 H), NR 9 R 10 , hydroxyalkoxy, acylamino, and halogeno radicals; and 2-hydroxyethyloxyethyl radicals, wherein when R 5 is chosen from linear and branched C 1 –C 6 alkyl radicals and is substituted with hydroxyl or with alkoxy, then R 5 carries a second radical, wherein R 9 and R 10 , which are identical or different, are chosen from hydrogen atoms; and from C 1 –C 4 alkyl radicals optionally substituted with at least one radical chosen from hydroxyl, amino, C 1 –C 2 monoalkylamino, C 1 –C 2 dialkylamino, alkoxy and acylamino radicals, wherein in the acylamino radicals RCONH, R is chosen from C 1 –C 4 alkyl radicals; alternatively, R 9 and R 10 may form, together with the nitrogen atom to which they are attached, a heterocycle comprising at least one atom chosen from nitrogen, oxygen, and sulphur.