Magnetic recording media

US4567108A · kind A · utility

Assignee

• BASF SE

Inventors

• August Lehner
• Helmut Kopke · Bad Dürkheim, DE
• Hermann Roller · Ludwigshafen, DE
• Werner Balz · Schifferstadt, DE
• Werner Grau · Frankenthal (Pfalz), DE
• Eberhard Koester · Bischofswerda, DE
• Friedrich Sommermann · Kehl, DE

Key dates

• Filing date: Nov 19, 1984
• Grant date: Jan 28, 1986
• Expiry date: Nov 19, 2004

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31942
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

Magnetic recording media comprise a non-magnetic base which is provided with a magnetic layer consisting of finely divided anisotropic magnetic material which is dispersible in binders and additives, the binder being a mixture of (1) a high molecular weight thermoplastic linear polyurethane, (2) a polyvinylformal binder, a phenoxy resin, a cellulose ester or a vinyl chloride copolymer and (3) an OH-containing polyurethane which is crosslinked with polyisocyanates.