Preparation of metal-free phthalocyanines

US4145264A · kind A · utility

Assignee

• BASF SE

Inventors

• Peter Thoma · Mannheim, DE
• Wolfgang Habermann
• Joachim Kranz · Ludwigshafen, DE

Key dates

• Filing date: Mar 9, 1978
• Grant date: Mar 20, 1979
• Expiry date: Mar 9, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B47/067
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Metal-free phthalocyanines (PC) are prepared by electrolysis, at inert electrodes, of aromatic o-dinitriles in organic liquids which contain small amounts of dissolved electrolytically conductive compounds, in the presence of hydrogen or of a compound which eliminates hydrogen under the reaction conditions and in the presence of alkaline compounds (as activators). The PC formed may be isolated in the pure form by filtration. The product contains from 90 to 99% of PC. It is used for the preparation of PC-based pigments.