Magnetic recording media

US5543226A · kind A · utility

Assignee

• BASF Magnetics GmbH · DE

Inventors

• Michael Bobrich · Haßloch, DE
• August Lehner
• Hermann Roller · Ludwigshafen, DE
• Rudolf Suettinger · Heidelberg, DE
• Ria Kress · Ludwigshafen, DE
• Norbert Schneider · Schorndorf, DE
• Werner Lenz · Bad Dürkheim, DE
• Peter Engelhardt · Hessisch Oldendorf, DE
• Peter Rudolf · Frankenthal (Pfalz), DE
• Gregor Brodt · Heppenheim, DE
• Werner Balz · Schifferstadt, DE
• Albert Kohl · Laumersheim, DE

Key dates

• Filing date: Dec 18, 1992
• Grant date: Aug 6, 1996
• Expiry date: Dec 18, 2012

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 at least one magnetizable layer bonded thereon and based on a magnetic material dispersed in at least one polyurethane and one polyurethaneurea (meth)acrylate, the polyurethaneurea (meth)acrylate being obtained by reacting a hydroxyl-containing poly(meth)acrylate with a mixture of di- and polyisocyanates and converting the remaining NCO groups with ammonia or primary or secondary amines into urea groups.