Magnetic recording media

US5266408A · kind A · utility

Assignee

• BASF Magnetics GmbH · DE

Inventors

• Uwe Keppeler · Hochdorf-Assenheim, DE
• Hermann Dikow · Hockenheim, DE
• Helmut Auweter · Schifferstadt, DE
• Michael Bobrich · Haßloch, DE
• Jochen Rudolph · Neu Wulmstorf, DE
• Gregor Brodt · Heppenheim, DE
• Albert Kohl · Laumersheim, DE
• Werner Lenz · Bad Dürkheim, DE
• Rudolf Suettinger · Heidelberg, DE

Key dates

• Filing date: Dec 11, 1991
• Grant date: Nov 30, 1993
• Expiry date: Dec 11, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31609
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Magnetic recording media consist of a nonmagnetic substrate and one or more magnetizable layers bonded thereon and based on a polyurethane binder, the binder consisting of not less than 50% by weight of a branched polyurethane elastomer having sulfonate groups and possessing urea groups at the chain ends.