	US 12,239,726 B2
	Process for dyeing or bleaching keratin fibers using particular amino acids in high concentration
Mickaël Agach, Saint-Ouen (FR); Henri Samain, Chevilly Larue (FR); Simon Donck, Saint-Ouen (FR); Ambre Souvirou, Saint-Ouen (FR); and Leila Hercouet, Saint-Ouen (FR)
Assigned to L'OREAL, Paris (FR)
Appl. No. 18/013,659
Filed by L'Oreal, Paris (FR)
PCT Filed Jun. 30, 2021, PCT No. PCT/EP2021/068032 § 371(c)(1), (2) Date Dec. 29, 2022, PCT Pub. No. WO2022/003038, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 2006866 (FR), filed on Jun. 30, 2020; and application No. 2013092 (FR), filed on Dec. 11, 2020.
Prior Publication US 2023/0172826 A1, Jun. 8, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. A61Q 5/10 (2006.01); A61K 8/44 (2006.01); A61Q 5/08 (2006.01); A61Q 5/12 (2006.01)

CPC A61K 8/447 (2013.01) [A61Q 5/08 (2013.01); A61Q 5/10 (2013.01); A61Q 5/12 (2013.01); A61K 2800/4324 (2013.01); A61K 2800/87 (2013.01); A61K 2800/884 (2013.01)]

20 Claims

1. A method for bleaching and/or dyeing keratin fibers, comprising:

(i) applying to the keratin fibers a composition (A) comprising at least one amino acid chosen from compounds of formula (I₁), salts thereof, and mixtures of two or more thereof:

wherein in formula (I₁):

p represents an integer equal to 1 or 2;

when p=1, R forms a saturated 5- to 8-membered ring with the nitrogen atom; and

when p=2, R represents:

a hydrogen atom; or

a (C₁-C₁₂)alkyl group, interrupted with at least one heteroatom or group chosen from —S—, —NH—, and —C(NH)—, and/or substituted with at least one group chosen from hydroxyl, amino, and —NH—C(NH)—NH₂; and

wherein the total amount of amino acids present in composition (A) is at least 5% by weight, relative to the total weight of composition (A); and

(ii) applying to the keratin fibers a bleaching and/or dyeing composition.