Magnetic recording medium containing an isocyanate-free branched thermoplastic polyurethane binder resin with urea groups at the chain ends

US5130202A · kind A · utility

Assignee

• BASF SE

Inventors

• Uwe Keppeler · Hochdorf-Assenheim, DE
• Michael Bobrich · Haßloch, DE
• Guenter Heil
• Hermann Roller · Ludwigshafen, DE
• August Lehner
• Werner Lenz · Bad Dürkheim, DE
• Guenther Schulz · Bad Dürkheim, DE

Key dates

• Filing date: Aug 13, 1990
• Grant date: Jul 14, 1992
• Expiry date: Aug 13, 2010

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 which is applied firmly thereon and is based on a polyurethane binder, not less than 50% by weight of binder consisting of a branched polyurethane elastomer having urea groups at the chain ends.