Process of making a magnetic recording media

US4310565A · kind A · utility

Assignee

• BASF SE

Inventors

• August Lehner
• Heinrich Hartmann · Schifferstadt, DE
• Rudolf Bachmann
• Albert Kohl · Laumersheim, DE
• Herbert Spoor · Schifferstadt, DE
• Karl Mahler · Kehl, DE
• Werner Balz · Schifferstadt, DE

Key dates

• Filing date: May 15, 1980
• Grant date: Jan 12, 1982
• Expiry date: May 15, 2000

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B5/7021
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A process for the manufacture of magnetic recording media, comprising a non-magnetic base and, applied thereto, one or more magnetizable layers, consisting of an anisotropic magnetic material finely dispersed in an organic binder, wherein the binder contains at least 40% of an aqueous ionomeric polyurethane dispersion which at 50.degree. C. forms films having a modulus of elasticity of from 50 to 700 N/mm.sup.2 and a DIN No. 53,157 pendulum hardness of from 20 to 110 s, the corresponding values of the modulus and hardness at room temperature being more than 3.5 times higher.