Iron oxide magnetic pigments for the production of magnetic coatings

US4169912A · kind A · utility

Assignee

• Dynamit Nobel GmbH · DE

Inventors

• Eduard Schonafinger · Ludwigshafen, DE
• Paul Deigner · Bad Dürkheim, DE
• Manfred Ohlinger · Bischofswerda, DE
• Helmut Jakusch · Bischofswerda, DE
• Jurgen Amort · Troisdorf, DE
• Heinz Nestler · Troisdorf, DE
• Claus-Dietrich Seiler · Rheinfelden (Baden), DE
• Otto Ambros · Mannheim, DE

Key dates

• Filing date: Nov 3, 1977
• Grant date: Oct 2, 1979
• Expiry date: Nov 3, 1997

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31663
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

An iron oxide pigment having a coating of a silane of the formula EQU R.sub.n Si(OR').sub.4-n wherein PA1 R is an, in some cases, branched or oxygen-bridge-containing alkyl or alkenyl moiety of 1 to 18 carbon atoms, or an aryl moiety, PA1 R' is an, in some cases, branched and, in some cases, oxygen-bridge-containing alkyl moiety of 1 to 8, PA1 N=1 to 3, Or a hydrolysis product thereof; a magnetic tape containing such coated iron oxide pigment and a process for coating such iron oxide pigment. There is particularly disclosed the treatment of iron oxide magnetic pigments to thereby improve their wear resistance and dispersibility in organic mediums.