Process for producing electrophotographically active titanylphthalocyanine modifications

US5786121A · kind A · utility

Assignee

• SynTec Gesellschaft fuer Chemie und Technologie der Informationsaufzeichnung mbH · DE

Inventors

• Andreas Richter · Gaimersheim, DE
• Roland Ackermann · Neunkirchen, DE
• Manfred Lutz · Schweinfurt, DE
• Hans-Josef Humpert · Lippstadt, DE

Key dates

• Filing date: Jul 15, 1997
• Grant date: Jul 28, 1998
• Expiry date: Jul 15, 2017

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G9/0918
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process is for producing electrophotographically active titanylphthalocyanine. In the process, which has an improved space-time yield, titanylphthalocyanine is dissolved in pentafluoropropionic acid and a solvent of the group comprising halogenated alkanes/aromatic compounds or halogenated alkanes/aromatic compounds and sulphonic acids. The active form is precipitated by precipitation with water in the presence of a further polar organic solvent. A mixture of pentafluoropropionic acid and methylene chloride and a mixture of p-toluene sulphonic acid and methane sulphonic acid are particularly suitable as solvents. The precipitated product processes very good electrophotographic properties.