Storable formulations of cationic dyes with oxidizing agent as stabilizer

US4765797A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Manfred Hahnke · Kelkheim, DE
• Sierling Ong · Hofheim, DE
• Kurt Hohmann · Ybbs an der Donau, AT

Key dates

• Filing date: Jun 8, 1987
• Grant date: Aug 23, 1988
• Expiry date: Jun 8, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B67/0076
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Liquid formulations of mixtures of cationic dyes frequently have a very short storage life. As a consequence, these formulations give rise to customer complaints concerning incorrect dyeing strengths and hues and concerning isoluble constituents. It has now been found according to the invention that powder formulations and in particular liquid formulations of cationic dyes or of mixtures of these dyes can be stabilized by adding selected oxidizing agents.