Patent ID: 7582121

Claim:
A composition for dyeing keratin fibers, comprising, in a suitable medium: (a) at least one oxidation base chosen from diamino-N,N-dihydropyrazolone derivatives of formula (I) and addition salts thereof: wherein: R 1 , R 2 , R 3 , and R 4 , which may be identical or different, are chosen from: linear and branched C 1 -C 10 alkyl radicals optionally substituted with at least one radical chosen from OR 5 radicals, NR 6 R 7 radicals, carboxyl radicals, sulfonic radicals, carboxamido radicals CONR 6 R 7 , sulfonamido radicals SO 2 NR 6 R 7 , and heteroaryl and aryl radicals optionally substituted with at least one radical chosen from (C 1 -C 4 )alkyl, hydroxyl, C 1 -C 2 alkoxy, amino, and (di)(C 1 -C 2 )alkylamino groups; aryl radicals optionally substituted with at least one radical chosen from (C 1 -C 4 )alkyl, hydroxyl, C 1 -C 2 alkoxy, amino, and (di)(C 1 -C 2 )alkylamino radicals; and 5- or 6-membered heteroaryl radicals, optionally substituted with at least one radical chosen from (C 1 -C 4 )alkyl and (C 1 -C 2 )alkoxy radicals; R 3 and R 4 may also be hydrogen; R 5 , R 6 , and R 7 , which may be identical or different, are chosen from: hydrogen; linear and branched C 1 -C 4 alkyl radicals optionally substituted with at least one radical chosen from hydroxyl, C 1 -C 2 alkoxy, carboxamido CONR 8 R 9 , sulfonyl SO 2 R 8 , and aryl radicals optionally substituted with at least one radical chosen from (C 1 -C 4 )alkyl, hydroxyl, C 1 -C 2 alkoxy, amino, and (di)(C 1 -C 2 )alkylamino radicals; and aryl radicals optionally substituted with at least one radical chosen from (C 1 -C 4 )alkyl, hydroxyl, C 1 -C 2 alkoxy, amino, and (di)(C 1 -C 2 )alkylamino radicals; R 6 and R 7 , which may be identical or different, may also be chosen from carboxamido radicals CONR 8 R 9 and sulfonyl radicals SO 2 R 8 ; R 8 and R 9 , which may be identical or different, are chosen from hydrogen; linear and branched C 1 -C 4 alkyl radicals optionally substituted with at least one radical chosen from hydroxyl and C 1 -C 2 alkoxy radicals; R 1 and R 2 , and R 3 and R 4 , may form, together with the nitrogen atoms to which they are attached, a saturated or unsaturated 5- to 7-membered heterocycle optionally substituted with at least one radical chosen from halogen atoms, amino radicals, (di)(C 1 -C 4 )alkylamino radicals, hydroxyl radicals, carboxyl radicals, carboxamido radicals, (C 1 -C 2 )alkoxy radicals, and C 1 -C 4 alkyl radicals optionally substituted with at least one radical chosen from hydroxyl, amino, (di)alkylamino, alkoxy, carboxyl, and sulfonyl radicals; R 3 and R 4 may also form, together with the nitrogen atom to which they are attached, a 5- or 7-membered heterocycle, the carbon atoms of which may be replaced with at least one entity chosen from optionally substituted oxygen and nitrogen atoms; (b) at least one coupler; and (c) at least one heterocyclic direct dye.