Precipitated alumina for use in magnetic recording disc media
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United States of America Patent
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Sep 13, 1983
Grant Date -
N/A
app pub date -
Apr 16, 1981
filing date -
Apr 16, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A magnetic recording medium and method of producing the same are taught. The medium comprises magnetic particles and alumina particles dispersed in a binder as a unitary coating whereby each of the alumina particles disposed in the binder is substantially equal to the thickness of the medium wherein the alumina particles are produced by first forming an aluminum hydrate from alumina hydrate gel according to the following equation: Al.sub.2 O.sub.3.nH.sub.2 O.fwdarw.Al.sub.2 O.sub.3.3H.sub.2 O+(n-3)H.sub.2 O and heating the aluminum hydrate above approximately 800.degree. C. to form alumina of substantially spherical configuration according to the following equation: Al.sub.2 O.sub.3.3H.sub.2 O.fwdarw.Al.sub.2 O.sub.3 +3H.sub.2 O
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