Manufacture of acicular ferromagnetic metal pigments containing iron

US4017303A · kind A · utility

Assignee

• BASF SE

Inventors

• Eberhard Koester · Bischofswerda, DE
• Gerd Wunsch · Speyer, DE
• Paul Deigner · Bad Dürkheim, DE
• Werner Stumpfi
• Hans H. Schneehage · Bad Dürkheim, DE

Key dates

• Filing date: Jul 14, 1975
• Grant date: Apr 12, 1977
• Expiry date: Jul 14, 1995

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/42
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process for the manufacture of acicular ferromagnetic metal pigments containing iron, having a reduced field strength distribution and a steeper residual magnetization curve, by applying an alkaline earth metal cation and an organic compound having at least one group capable of forming a chelate to appropriate acicular iron oxides and then reducing the treated oxides.