Patent · US Expired

Production of magnetic recording media

US5082689A · kind A · utility

1Cited by

1References

6Claims

0Family size

Assignee

BASF SE

Inventors

Ludwig Kreitner · Heppenheim, DE
Werner Grau · Frankenthal (Pfalz), DE
August Lehner
Hans Reichert · Oberkirch, DE
Friedrich Sommermann · Kehl, DE
Norbert Schneider · Schorndorf, DE
Gerd Erhardt · Kehl, DE

Key dates

Filing date	Aug 23, 1990
Grant date	Jan 21, 1992
Priority date	—
Expiry date	Aug 23, 2010

Classification

Technology area (CPC G)Physics
CPC primaryG11B5/842
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Magnetic recording media are produced by preparing a dispersion of anisotropic magnetic materials in solution in an organic binder using dispersants and further conventional additives, applying the dispersion in the form of a layer onto a nonmagnetic substrate and solidifying the applied magnetic layer, by a process in which a cylindrical grinding chamber is used which is provided with an anchor stirrer or helical stirrer and contains grinding media whose specific gravity is lower than that of the magnetic material.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.