	US 11,672,747 B2
	Process for dyeing keratin materials using a direct dye and an aliphatic ammonium salt, and composition comprising same
Stéphane Sabelle, Aulnay-sous-Bois (FR); and Olivier Guerard, Aulnay-sous-Bois (FR)
Assigned to L'OREAL, Paris (FR)
Appl. No. 17/415,665
Filed by L'OREAL, Paris (FR)
PCT Filed Dec. 17, 2019, PCT No. PCT/EP2019/085630 § 371(c)(1), (2) Date Jun. 17, 2021, PCT Pub. No. WO2020/127250, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 1874026 (FR), filed on Dec. 21, 2018.
Prior Publication US 2022/0183944 A1, Jun. 16, 2022
Int. Cl. A61Q 5/10 (2006.01); A61K 8/41 (2006.01); A61K 8/35 (2006.01); A61K 8/46 (2006.01); A61Q 5/06 (2006.01)

CPC A61K 8/416 (2013.01) [A61K 8/35 (2013.01); A61K 8/355 (2013.01); A61K 8/466 (2013.01); A61Q 5/065 (2013.01); A61K 2800/4322 (2013.01)]

18 Claims

1. A process for dyeing keratin fibers, comprising applying to the keratin fibers a direct dye composition comprising:

a) at least one direct dye; and

b) at least one tetra(C₁-C₈)alkylammonium salt of formula (A), optical, geometrical, or tautomeric isomers thereof, solvates thereof, or mixtures thereof:

wherein in formula (A):

R₁, R₂, R₃, and R₄, independently of each other, are chosen from a linear or branched, saturated or unsaturated (C₁-C₈) hydrocarbon-based groups, which may be optionally substituted with one or more radicals chosen from hydroxyl, amino, (di)(C₁-C₆)alkylamino, carboxy, carboxylate, carbamide, (C₁-C₄)alkoxy, —SO₃H, sulfonate, and/or aryl; and

Y⁻represents an anionic counterion;

wherein when one of the hydrocarbon-based groups of R₁, R₂, R₃, or R₄is substituted with a carboxylate or sulfonate group, Y⁻is absent to ensure the electrical neutrality of the at least one tetra(C₁-C₈)alkylammonium salt of formula (A); and

wherein the tetra(C₁-C₈)alkylammonium salt is present in an amount ranging from 1% to 99.5% by weight, relative to the total weight of the composition,

wherein the process does not comprise mixing the composition with an oxidizing composition.