Production of magnetic recording media

US4551359A · kind A · utility

Assignee

• BASF SE

Inventors

• August Lehner
• Joachim Hack · Ludwigshafen, DE
• Karl Krucker · Bischofswerda, DE
• Werner Balz · Schifferstadt, DE
• Karl H. Roemer · Bischofswerda, DE
• Peter Rudolf · Ludwigshafen, DE
• Roland Falk · Achern, DE
• Guenter Eckert · Schifferstadt, DE

Key dates

• Filing date: Jul 12, 1984
• Grant date: Nov 5, 1985
• Expiry date: Jul 12, 2004

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B5/7013
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

Magnetic recording media possessing a thin magnetic layer are produced by dispersing finely divided magnetically anisotropic material and conventional additives in a solution of a polymeric binder in an organic solvent, applying a layer of the dispersion to a non-magnetizable base by means of a knife-coater, then, if required, orienting the magnetically anisotropic material by means of a magnetic field and drying the applied layer, a high molecular weight organic compound which acts as a thickener being added to the magnetic dispersion.