Multi-tone hair dyeing method in three steps

US11918671B2 · kind B2 · utility

Assignee

• Henkel AG & Co. KGaA · DE

Inventors

• Constanze Kruck · Grevenbroich, DE
• Melanie Moch · Dormagen, DE
• Daniela Kessler-Becker · Leverkusen, DE
• Sandra HILBIG · Bochum, DE

Key dates

• Filing date: Oct 13, 2020
• Grant date: Mar 5, 2024
• Expiry date: Oct 13, 2040

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61K2800/884
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A method for dyeing hair is disclosed. The method comprises (1) treating hair with an oxidative colorant agent (A); (2) subsequent to (1), treating the hair with a CH-acidic hair dyeing agent (B); and (3) subsequent to (2), treating the hair with a cosmetic decolorizing agent (Ox). The method comprises a time interval between (1) and (2) of from about 1 minute to about 1.5 months, and a time interval between (2) and (3) of from about 1 minute to about 1.5 months. A process for multitonal dyeing of hair is also disclosed. The process comprises preparing an oxidative colorant agent (A); treating hair with the agent (A) to give a colored hair; preparing a CH-acidic hair dyeing agent (B); treating the colored hair with the agent (B) to give a dyed hair; and treating the dyed hair with a cosmetic decolorizing agent (Ox) to give a multitonal dyed hair.