Vat dye based on flouranthene

US4925954A · kind A · utility

Assignee

• BASF SE

Inventors

• Manfred Patsch · Monsheim, DE
• Gerhard Epple · Bad Dürkheim, DE
• Helmut Flohr · Ginsheim-Gustavsburg, DE
• Helmut Degen · Bischofswerda, DE
• Uwe Nahr · Schifferstadt, DE

Key dates

• Filing date: Nov 23, 1988
• Grant date: May 15, 1990
• Expiry date: Nov 23, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B5/26
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A vat dye based on monobromofluoranthene is prepared by a process in which monobromofluoranthene which contains no more than 7% of dibromofluoranthene is reacted with 1-amino-4-benzoylaminoanthraquinone, the reaction product is condensed at from 50.degree. to 70.degree. C. in 83-88% strength sulfuric acid to give the carbazole compound, and the latter is then further brominated to a bromine content of from 20 to 23% by weight. The dyes obtained by the novel process are very useful for dyeing cotton.