Transformation of crude halogenated copper phthalocyanine pigments into a useful pigmentary state

US5944887A · kind A · utility

Assignee

• BASF SE

Inventors

• Andrea Schutze · Hamburg, DE
• Frank Scherhag · Schifferstadt, DE
• Peter Bottcher · Usedom, DE

Key dates

• Filing date: Oct 13, 1998
• Grant date: Aug 31, 1999
• Expiry date: Oct 13, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B67/0035
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process for transforming crude halogenated copper phthalocyanine pigments having a chlorine content of from 4 to 50.3% by weight into a useful pigmentary state comprises treating the crude pigment at elevated temperature with a liquid acidic aromatic organic medium in the presence of a copper phthalocyanine derivative selected from the group consisting of the copper phthalocyanine-sulfonic and -carboxylic acids and their alkali metal, ammonium and alkylammonium salts, the amino-substituted and aminomethylated copper phthalocyanines and their reaction products with alkylating agents, sulfonic acids, sulfonyl chlorides and carbonyl chlorides, the imidomethylene- and amidomethylene-substituted copper phthalocyanines, the alkyl-, aryl- and cyano-substituted copper phthalocyanines and the hydroxyl- and alkoxy-substituted copper phthalocyanines, if desired in the presence of water.