Method of preparing a magnetic recording medium
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United States of America Patent
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Dec 3, 1991
Issued Date -
N/A
app pub date -
Apr 16, 1991
filing date -
Feb 25, 1989
priority date (Note) -
Expired
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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.
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