Patent · US Expired

Production of magnetic recording media having a backing coating

US4534999A · kind A · utility

3Cited by

6References

3Claims

0Family size

Assignee

BASF SE

Inventors

Hermann Roller · Ludwigshafen, DE
August Lehner
Joachim Hack · Ludwigshafen, DE
Werner Grau · Frankenthal (Pfalz), DE
Werner Balz · Schifferstadt, DE
Reinhold Baur · Ortenberg, DE

Key dates

Filing date	Jul 12, 1984
Grant date	Aug 13, 1985
Priority date	—
Expiry date	Jul 12, 2004

Classification

Technology area (CPC G)Physics
CPC primaryG11B5/7028
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Magnetic recording media which have a thin backing coating and consist of a non-magnetic flexible base and a magnetic layer which is applied to one side of the base and comprises magnetic material finely dispersed in an organic binder are produced by applying a dispersion of finely divided non-magnetizable conductive and non-conductive solids and conventional additives in a solution of a polymeric binder in an organic solvent to that side of the base which is opposite the magnetic layer by means of a knife-coater, and then drying the layer, a high molecular weight organic compound which acts as a thickener being added to the backing coating dispersion.

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