Dyes and colorants

US6828443B1 · kind B1 · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Detlef Hollenberg · Hilden, DE
• Horst Hoeffkes · Goldkronach, DE
• Frank Naumann · Erlangen, DE
• David Rose · Hilden, DE
• Leszek J. Wolfram · Stamford, US
• Joachim-Kurt Foitzik · Seeheim-Jugenheim, DE

Key dates

• Filing date: Jun 13, 2002
• Grant date: Dec 7, 2004
• Expiry date: Jun 28, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B51/00
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A hybrid dye is provided that is useful for coloring keratin fibers and skin. The hybrid dye has the structure X-S-Y, where X is derived from a substantive dye, Y is derived from an oxidation dye precursor or a melanin precursor, and S is a direct bond or spacer group. The present invention also provides a composition for coloring keratin fibers that contains the hybrid dye.