Preparation of C.I. Vat Blue 16

US4824608A · kind A · utility

Assignee

• BASF SE

Inventors

• Reinhard Helwig · Ludwigshafen, DE
• Helmut Hoch

Key dates

• Filing date: Sep 1, 1987
• Grant date: Apr 25, 1989
• Expiry date: Sep 1, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B3/30
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The dye is obtained by alkylating 16,17-dihydroxyviolanthrene-5,10-dione in a tertiary aliphatic or cycloaliphatic amine as solvent at from 100.degree. to 230.degree. C. in high yield and high purity.