Preparation of stabilized chromium dioxide with sodium tetracarbonylferrate

US5064549A · kind A · utility

Assignee

• BASF SE

Inventors

• Michael Mueller · Dresden, DE
• Ekkehard Schwab · Neustadt, DE
• Helmut Auweter · Schifferstadt, DE
• Rainer Feser · Havelsee, DE
• Bernhard Boettcher · Bad Dürkheim, DE
• Norbert Mueller · Ostseebad Nienhagen, DE
• Wolfgang Kochanek · Neustadt, DE

Key dates

• Filing date: Nov 20, 1990
• Grant date: Nov 12, 1991
• Expiry date: Nov 20, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/80
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

Stabilized acicular ferromagnetic chromium dioxide is prepared by reductive treatment of the chromium dioxide with Na.sub.2 [Fe(CO).sub.4 ], and this material is present in magnetic recording media.