Process for the preparation of sulphur dyestuffs of the phthalocyanine series

US4486350A · kind A · utility

Assignee

• Cassella Aktiengesellschaft · DE

Inventors

• Wolfgang Bauer · Krefeld, DE
• Klaus Kuhlein · Kelkheim, DE
• Gert Nagl · Niederdorfelden, DE

Key dates

• Filing date: Mar 28, 1983
• Grant date: Dec 4, 1984
• Expiry date: Mar 28, 2003

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B49/122
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Preparation of phthalocyanine sulphur dyestuffs is improved by reducing phthalocyaninesulphochlorides in the presence of hydriodic acid and a non-free metal reducing agent which converts iodine into hydriodic acid.