US 12,109,291 B2
Oxidative dyeing agent for keratin fibers comprising novel dye precursor combinations
Razi Abbas, Shelton, CT (US); Tugce Cansev, Hamburg (DE); Thomas Hippe, Appen (DE); Astrid Kleen, Haseldorf (DE); Hartmut Manneck, Barnitz (DE); Stefan Hoepfner, Hamburg (DE); and Tiffany Lea Fielder, Norwalk, CT (US)
Assigned to Henkel AG & Co. KGaA, Duesseldorf (DE)
Filed by Henkel AG & Co. KGaA, Duesseldorf (DE)
Filed on Feb. 17, 2023, as Appl. No. 18/111,117.
Claims priority of provisional application 63/314,208, filed on Feb. 25, 2022.
Prior Publication US 2023/0310296 A1, Oct. 5, 2023
Int. Cl. A61Q 5/10 (2006.01); A61K 8/41 (2006.01); A61K 8/49 (2006.01)
CPC A61K 8/4973 (2013.01) [A61K 8/411 (2013.01); A61Q 5/10 (2013.01); A61K 2800/30 (2013.01); A61K 2800/4324 (2013.01); A61K 2800/882 (2013.01)] 20 Claims
 
1. An agent for the oxidative dyeing of keratinous fibers, comprising:
(A) a coupling oxidation dye precursor 2-(1,3-benzodioxol-5-ylamino)ethanol and/or at least one of its physiologically tolerated salts, and
(B) an oxidation base 2-methoxymethyl-para-phenylenediamine and/or at least one of its physiologically tolerated salts,
wherein the agent is substantially free of any resorcinol compound of structure (I)

OG Complex Work Unit Chemistry
in which
X means a hydrogen atom or a C1-C10 alkyl group,
wherein the agent is further substantially free of any chlorinated aromatic nitro dyes, and
wherein the agent is further substantially free of dissolved hydrogen peroxide.