The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 03, 1991
Filed:
Apr. 16, 1991
Applicant:
Inventors:
Assignee:
BASF Magnetics GmbH, Werk Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
427128 ; 428900 ;
Abstract
A magnetic recording medium consisting of a flexible layer support and a magnetic layer consisting predominantly of magnetic particles finely divided in a binder and nonmagnetic additives applied to the layer support is obtained with improved orientation of the magnetic pigments by adding a dispersion stabilizing component to the magnetic dispersion at a uniform rate over the whole period of dispersion. Highly purified lecithin or a mixed ester of a polyethoxy phosphate ester or ethylene diaminodistearate, a polyurethane resin containing sulphonate groups or a vinyl chloride/vinyl alcohol copolymer is preferred as stabilizing additive.