Preparation of acicular ferromagnetic metal particles consisting essentially of iron

US4729785A · kind A · utility

Assignee

• BASF SE

Inventors

• Ekkehard Schwab · Neustadt, DE
• Werner Steck · Ludwigshafen, DE
• Peter Rudolf · Ludwigshafen, DE
• Guenter Vaeth · Schifferstadt, DE
• Helmut Jakusch · Bischofswerda, DE
• Jenoe Kovacs · Heßheim, DE

Key dates

• Filing date: Apr 29, 1986
• Grant date: Mar 8, 1988
• Expiry date: Apr 29, 2006

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B5/70615
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

Acicular metal particles consisting essentially of iron are prepared by reducing .alpha.-iron(III) oxide obtained--by dehydration--from acicular iron(III) oxide hydroxide prepared in the presence of phosphate ions and having a shape-stabilizing surface coating.