US 12,357,550 B2
Hair dyeing composition with improved durability
Bernd Nöcker, Darmstadt (DE); Steven Breakspear, Darmstadt (DE); Fariba Ghiasi, Darmstadt (DE); and Niu Jian, Darmstadt (DE)
Assigned to KAO CORPORATION, Tokyo (JP)
Appl. No. 18/245,963
Filed by KAO CORPORATION, Tokyo (JP)
PCT Filed Sep. 20, 2021, PCT No. PCT/EP2021/075790
§ 371(c)(1), (2) Date Mar. 20, 2023,
PCT Pub. No. WO2022/069279, PCT Pub. Date Apr. 7, 2022.
Claims priority of application No. 20199263 (EP), filed on Sep. 30, 2020.
Prior Publication US 2023/0381078 A1, Nov. 30, 2023
Int. Cl. A61Q 5/10 (2006.01); A61K 8/41 (2006.01); A61Q 5/06 (2006.01)
CPC A61K 8/416 (2013.01) [A61Q 5/065 (2013.01); A61K 2800/4322 (2013.01)] 17 Claims
 
1. A dyeing composition for keratin fibers, comprising:
one or more first direct dyes selected from HC Blue 18, HC Red 18, HC Yellow 16, and salts thereof;
one or more second direct dyes selected from Disperse Black 9, Acid Yellow 1, 2-amino-6-chloro-4-nitrophenol and salts thereof; and
one or more alkalizing agents.