Orthotrifluoromethyl containing phenylazonaphthol dyestuffs

US4757137A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gerhard Wolfrum · Waldershof, DE
• Erich Klauke
• Hans Otten · London, CA

Key dates

• Filing date: Sep 22, 1983
• Grant date: Jul 12, 1988
• Expiry date: Sep 22, 2003

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B62/028
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Azo dyestuffs of the formula ##STR1## wherein R.sub.1 denotes acyl, PA0 R.sub.2 denotes hydrogen, fluorine, chlorine or trifluoromethyl, PA0 R.sub.3 denotes hydrogen, optionally substituted C.sub.1 -C.sub.4 -alkyl, cyclohexyl or optionally substituted phenyl and PA0 R.sub.4 denotes hydrogen or C.sub.1 -C.sub.4 -alkyl group are suitable for dyeing natural and synthetic fibre materials, for example for dyeing wool or polyamide fibres, in level read to violet shades with very good fastnesses to light, wet processing and perspiration, the color yield being good.