Process for preparing water-insoluble blue azo dyes on the fiber: hydroxynaphthoic amide and diazotized di-alkoxy-benzidine

US4696675A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Hasso Hertel
• Klaus Hunger · Kelkheim, DE
• Heinrich Frolich · Niedernhausen, DE

Key dates

• Filing date: Mar 27, 1986
• Grant date: Sep 29, 1987
• Expiry date: Mar 27, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S8/918
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Using the method of azoic dyeing, fast blue dyeings are obtained when the bis-diazotable diazo component used is a compound of the general formula (1) ##STR1## in which R is a straight-chain or branched alkyl group of 3 to 5 carbon atoms or a (C.sub.1 -C.sub.3)-alkoxy-(C.sub.2 -C.sub.4)-alkyl group having straight-chain and/or branched alkyl groups of in total 3 to 5 carbon atoms, and the coupling component used is a compound conforming to the general formula (2) ##STR2## in which Z stands for a hydrogen atom or a halogen atom or an alkoxy group of 1 to 4 carbon atoms and Aryl denotes a phenyl radical or a 1-naphthyl radical which can be substituted by 1, 2 or 3 substituents from the group consisting of halogen, nitro, alkyl of 1 to 4 carbon atoms and alkoxy of 1 to 4 carbon atoms, and the coupling reaction and dye formation on the fiber are carried out at a pH value between 4 and 10.