Dyeing preparations and their use for preparing developing dyes

US4242094A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Erich Feess · Hofheim, DE
• Willy Gronen

Key dates

• Filing date: Feb 21, 1979
• Grant date: Dec 30, 1980
• Expiry date: Feb 21, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B67/0079
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Developing dyes are especially easily produced by using preparations containing molar amounts of diazo or coupling components per weight or volume unit or a multiple or a fraction thereof in simple numerical ratios. Since the diazo component is the free finely dispersed amine these preparations are stable and allow the reaction of stoichiometric amounts. Thus, multicolor effects are feasible which hitherto could not be obtained at all or with difficulties only.