Water-insoluble monoazo dyestuffs and their preparation

US4440681A · kind A · utility

Assignee

• Cassella Aktiengesellschaft · DE

Inventors

• Horst Tappe · Dietzenbach, DE
• Rudolf Lowenfeld · Dreieich, DE
• Uwe Kosubek · Büttelborn, DE
• Maria Kallay · Königstein, DE

Key dates

• Filing date: Apr 24, 1981
• Grant date: Apr 3, 1984
• Expiry date: Apr 24, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B29/0825
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Water-insoluble azo dyestuffs, their manufacture and use, which have the formula ##STR1## wherein D is a substituted phenyl or heterocyclic moiety which are free from ionic substituents and R.sup.1 is methyl or ethyl.