Gentle agents and methods for oxidative dyeing using selected dicarboxylic acids

US10987291B2 · kind B2 · utility

Assignee

• Henkel AG & Co. KGaA · DE

Inventors

• Hartmut Manneck · Klein Wesenberg, DE
• Thomas Hippe · Appen, DE
• Astrid Kleen-Fehres · Hamburg, DE

Key dates

• Filing date: May 31, 2017
• Grant date: Apr 27, 2021
• Expiry date: Nov 24, 2037

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61K2800/882
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The present disclosure concerns colouring agents for keratinous fibres, in particular for human hair, which—with respect to its weight—contain at least one compound selected from the group formed by oxidative dye precursors, direct dyes and mixtures thereof, from about 0.1 to about 5% by weight of dicarboxylic acid(s) containing from about 2 to about 10 carbon atoms and/or salt(s) of this(these) acid(s), from about 20 to about 95% by weight of water, and less than about 0.1% by weight of peroxy compound(s), to produce oxidative colouring agents with improved protection of fibres.