Magnetic recording media

US5075179A · kind A · utility

Assignee

• BASF SE

Inventors

• August Lehner
• Rudolf Suettinger · Heidelberg, DE
• Michael Bobrich · Haßloch, DE
• Hermann Dikow · Hockenheim, DE
• Hermann Roller · Ludwigshafen, DE
• Werner Lenz · Bad Dürkheim, DE
• Ludwig Kreitner · Heppenheim, DE
• Werner Loch · Erpolzheim, DE
• Norbert Schneider · Schorndorf, DE

Key dates

• Filing date: Dec 12, 1989
• Grant date: Dec 24, 1991
• Expiry date: Dec 12, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/257
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

Magnetic recording media consist of a nonmagnetic substrate and one or more magnetizable layers which are firmly applied thereon and are based on a magnetic material which is finely dispersed in a polymer binder and further conventional additives and essentially consists of ferromagnetic chromium dioxide, and the said recording media are particularly stable to the chemical decomposition due to moisture and oxidizable compounds and hence to deterioration in the magnetic properties, owing to the addition of from 0.1 to 8% by weight of an organic compound from the group consisting of the antioxidants, based on the amount of chromium dioxide, to the magnetic layer.