| US 7,481,847 B2 | ||
| Dye composition comprising at least one cationic hydrazone direct dye, dyeing process, and multi-compartment devices | ||
| Alain Lagrange, Coupvray (France); and Leïla Hercouet, Neuilly Plaisance (France) | ||
| Assigned to L'Oreal S.A., Paris (France) | ||
| Filed on Mar. 27, 2007, as Appl. No. 11/727,532. | ||
| Claims priority of provisional application 60/792956, filed on Apr. 19, 2006. | ||
| Claims priority of application No. 06 51074 (FR), filed on Mar. 28, 2006. | ||
| Prior Publication US 2007/0234487 A1, Oct. 11, 2007 | ||
| Int. Cl. A61Q 5/10 (2006.01); C07D 239/00 (2006.01); C07C 50/18 (2006.01) | ||
| U.S. Cl. 8—405 [8/406; 8/423; 8/426; 8/435; 8/565; 8/567; 8/643; 552/208; 544/242] | 25 Claims |
| 1. A dye composition comprising, in a medium suitable for dyeing human keratin fibers:
(a) at least one direct dye chosen from cationic direct hydrazone dyes of formula (I) and tautomeric forms thereof:
[A-C(R3)═N—N(R1)—B]+X (I)
wherein:
R1 and R3, which may be identical or different, are chosen from hydrogen and linear or branched C1-C10 alkyl radicals optionally bearing a hydroxyl group;
A is a fused or non-fused, optionally substituted cationic heterocycle chosen from pyrimidinone, indole, and benzothiazole
rings; the ring A being linked to the carbon of C(R3) via a carbon atom;
B is a saturated or unsaturated, optionally substituted tricycle chosen from dibenzofurans, carbazoles, anthraquinones, and
dibenzothienyls; the saturated or unsaturated tricycle B being linked to the nitrogen atom of the hydrazone function via a
carbon atom of one of the three rings;
X is chosen from anions and mixtures of anions that are cosmetically acceptable;
(b) at least one cosmetic agent chosen from thickening polymers and surfactants.
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