Production of magnetic recording media

US4430362A · kind A · utility

Assignee

• BASF SE

Inventors

• Milena Melzer · Ludwigshafen, DE
• Norbert Schneider · Schorndorf, DE
• Helmut Kopke · Bad Dürkheim, DE
• Klaus Schoettle · Heidelberg, DE
• Eberhard Koester · Bischofswerda, DE
• Werner Balz · Schifferstadt, DE
• Werner Grau · Frankenthal (Pfalz), DE

Key dates

• Filing date: Dec 16, 1982
• Grant date: Feb 7, 1984
• Expiry date: Dec 16, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L75/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Magnetic recording media are produced by a method wherein a fluid dispersion of finely divided magnetically anisotropic material in a film-forming binder mixture containing a polyurethane (obtained from a polyester which possesses free hydroxyl groups, and a di- or polyisocyanate) is applied to a non-magnetic base and the magnetic layer is then hardened.