MANUFACTURE OF AZO DYE BY DIAZOTIZATION AND COUPLING

MANUFACTURE OF AZO DYE BY DIAZOTIZATION AND COUPLING

An improved process for the preparation of azo dyestuffs of the formula comprising diazotizing a 2-halo-4-nitroaniline at 10 DEG to 35 DEG C. in 70 to 100 percent by weight strength acetic acid by means of nitrosylsulphuric acid, adjusting the acetic acid content of the resulting diazo solution to 6...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: URURITSUHI BIYUURERU, UORUFUGANGU BOODENSHIYUTETSUTO, HAINTSU HEENERU, HORUSUTO TATSUPE, EEBERUHARUTO HEEBESHIYUTORAITO
Format: Patent
Sprache:eng
Schlagworte:
ADHESIVES
CHEMISTRY
DYES
LAKES
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
MORDANTS
NATURAL RESINS
ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES
PAINTS
POLISHES
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Beschreibung
Zusammenfassung:An improved process for the preparation of azo dyestuffs of the formula comprising diazotizing a 2-halo-4-nitroaniline at 10 DEG to 35 DEG C. in 70 to 100 percent by weight strength acetic acid by means of nitrosylsulphuric acid, adjusting the acetic acid content of the resulting diazo solution to 60 to 85% by the addition of water, and at a temperature from 15 DEG to 45 DEG C. adding an appropriate carbazole to the diazo solution as a solid or in the form of a suspension in 60 to 100 percent strength by weight acetic acid and coupling the carbazole to the diazotized amine to produce said azo dyestuff and isolating the dyestuff.