Patent ID: 7238211

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), or at least one addition salt 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 atoms, C 1 –C 4 alkyl, C 2 –C 6 (poly)hydroxyalkyl, C 2 –C 6 (poly)aminoalkyl, and C 2 –C 6 aminohydroxyalkyl radicals; R 5 is chosen from linear and branched C 1 –C 6 alkyl radicals optionally substituted with at least one radical chosen from C 1 –C 2 alkoxy, hydroxyl, carboxyl, sulphonic (—SO 3 H), and NR 9 R 10 radicals; acylaminoethyl radicals; and 2-(2-hydroxyethyloxy)ethyl radicals; and R 6 is chosen from linear and branched C 1 –C 4 alkyl radicals substituted with at least one radical chosen from hydroxyl, C 1 –C 2 alkoxy, amino, C 1 –C 2 (di)alkylamino, carboxyl, acylamino, (di)hydroxyalkylamino radicals; and 2-(2-hydroxyethyloxy)ethyl radicals; wherein R 9 and R 10 , which are independent of each other, are chosen from hydrogen atoms and C 1 –C 4 alkyl radicals optionally substituted with at least one radical chosen from hydroxyl, amino, monoalkylamino, dialkylamino, alkoxy, and acylamino radicals.