Metal-free, substituted phthalocyanines in the .chi.-modification

US5367069A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gunther Beck · Leverkusen, DE
• Bernd Kaletta · Langenfeld, DE

Key dates

• Filing date: May 10, 1993
• Grant date: Nov 22, 1994
• Expiry date: May 10, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B67/0016
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Metal-free phthalocyanines in the .chi.-modification substituted in up to four ortho positions can be prepared by tetramerisation of a reaction mixture consisting of phthalonitriles substituted in the 3-position with phthalonitrile in a molar ratio of 4:0 to 1:40 in the presence of a base and subsequent heat treatment at temperatures of between 100.degree. and 300.degree. C. They constitute excellent organic pigments.