Azo direct dyes and method for dyeing hair using these dyes

US9587116B2 · kind B2 · utility

Assignee

• NOXELL CORPORATION · US

Inventors

• Heike Gertrud Abel · Eiterfeld, DE
• Armin Osan · Darmstadt, DE
• Markus Speckbacher · Aschaffenburg, DE
• Ingo Weber · Basel, CH

Key dates

• Filing date: Oct 29, 2015
• Grant date: Mar 7, 2017
• Expiry date: Oct 29, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B62/0081
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A compound of formula (I) or (II) or (III):wherein R5, R6, R7, R8′, R8″ and R8″′ are as defined herein. This compound can be used in a composition for the dyeing of fibers.