US 12,485,076 B2
Liquid hair dye composition
Keiji Monda, Katsushikak-ku (JP); and Masahiko Watanabe, Sumida-ku (JP)
Assigned to KAO CORPORATION, Tokyo (JP)
Appl. No. 17/440,418
Filed by KAO CORPORATION, Tokyo (JP)
PCT Filed Dec. 24, 2019, PCT No. PCT/JP2019/050546
§ 371(c)(1), (2) Date Sep. 17, 2021,
PCT Pub. No. WO2020/188936, PCT Pub. Date Sep. 24, 2020.
Claims priority of application No. 2019-051356 (JP), filed on Mar. 19, 2019.
Prior Publication US 2022/0151897 A1, May 19, 2022
Int. Cl. A61K 8/44 (2006.01); A61K 8/22 (2006.01); A61K 8/34 (2006.01); A61K 8/36 (2006.01); A61K 8/41 (2006.01); A61K 8/46 (2006.01); A61K 8/86 (2006.01); A61Q 5/06 (2006.01); A61Q 5/10 (2006.01)
CPC A61K 8/44 (2013.01) [A61K 8/22 (2013.01); A61K 8/345 (2013.01); A61K 8/36 (2013.01); A61K 8/416 (2013.01); A61K 8/463 (2013.01); A61K 8/86 (2013.01); A61Q 5/065 (2013.01); A61Q 5/10 (2013.01); A61K 2800/30 (2013.01); A61K 2800/4322 (2013.01); A61K 2800/4324 (2013.01); A61K 2800/591 (2013.01)] 12 Claims
 
1. A hair dyeing method, comprising the following (I) and (II):
(I): mixing a first agent comprising an alkali agent and an oxidative dye precursor, a second agent comprising an oxidizing agent, and a liquid hair dye composition as a third agent comprising the following components (A), (B) and (C):
(A) one or more azo dyes selected from the group consisting of the following formulae (A-1), (A-2) and (A-3), in a content of 1.5 mass % or more:

OG Complex Work Unit Chemistry
(B) one or more surfactants with an HLB of 7 or more, selected from the group consisting of an anionic surfactant, an amphoteric surfactant, and a polyoxyethylene alkyl or alkenyl ether having an alkyl or alkenyl group with from 12 to 20 carbon atoms, having a polyoxyethylene with an average number of added moles of from 20 to 60; and
(C) water;
in a mass ratio of the third agent to a total of the first agent and the second agent, (the third agent/(the first agent+the second agent), of 0.01 or more and 0.4 or less, to prepare a liquid mixture; and
(II): applying the liquid mixture prepared in (I) to hair,
wherein said liquid mixture does not contain 2-amino-2-methylpropanol.