Pyrazole azo dyestuffs

US5446136A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Kerstin Pape · Leverkusen, DE
• Horst Berneth · Leverkusen, DE

Key dates

• Filing date: Dec 13, 1994
• Grant date: Aug 29, 1995
• Expiry date: Dec 13, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B43/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Pyrazole azo dyestuffs of the formula (I) ##STR1## in which R.sup.1 denotes hydrogen or an acyl radical, PA0 R.sup.2 denotes hydrogen, alkyl, alkenyl, cycloalkyl, aralkyl, aryl or a heterocyclic radical which is optionally bonded via alkylene, PA0 R.sup.3 denotes hydrogen, halogen, alkyl or alkoxy, PA0 R.sup.4 denotes hydrogen, halogen, hydroxyl, amino, nitro, cyano, alkyl, alkoxy, acylamino, acyloxy or alkoxycarbonyl, PA0 R.sup.5 and R.sup.6 independently of one another in each case denote hydrogen, alkyl, aralkyl or aryl or PA0 NR.sup.5 R.sup.6 together denotes a hydrogenated heterocyclic radical which is bonded via the nitrogen and optionally contains further hetero atoms, it being possible for all the alkyl, alkenyl, cycloalkyl, aralkyl, aryl, alkoxy and heterocyclic radicals present to be optionally substituted by nonionic substituents, a novel process for their preparation and their use for dyeing and printing materials.