Magnetic recording media

US4568612A · kind A · utility

Assignee

• BASF SE

Inventors

• August Lehner
• Werner Balz · Schifferstadt, DE
• Werner Lenz · Bad Dürkheim, DE
• Helmut Kopke · Bad Dürkheim, DE
• Rudolf Bachmann
• Milan Velic · Ludwigshafen, DE
• Milena Melzer · Ludwigshafen, DE
• Heinrich Hartmann · Schifferstadt, DE
• Reinhold Baur · Ortenberg, DE

Key dates

• Filing date: Jul 20, 1983
• Grant date: Feb 4, 1986
• Expiry date: Jul 20, 2003

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 comprise a non-magnetic base which is provided with a magnetic layer which consists of a dispersion of an anisotropic magnetic material in an organic binder which consists essentially of an OH-containing polyurea-urethane binder crosslinked with polyisocyanate. The OH-containing polyurea-urethane is obtained by reacting a polydiol, a diol and a primary or secondary aminoalcohol, and if appropriate a triol, with a diisocyanate.