Stock material or miscellaneous articles – Magnetic recording component or stock – Binder media
Reexamination Certificate
2007-11-06
2007-11-06
Bernatz, Kevin M. (Department: 1773)
Stock material or miscellaneous articles
Magnetic recording component or stock
Binder media
C428S842600, C428S403000
Reexamination Certificate
active
10369606
ABSTRACT:
A magnetic recording medium comprising a non-magnetic support, at least one primer layer formed on one surface of the non-magnetic support, comprising a non-magnetic powder and a binder resin, at least one magnetic layer formed on the primer layer, comprising a magnetic powder and a binder resin, and a back layer formed on the other surface of the non-magnetic support, wherein the magnetic powder contained in the uppermost layer of the magnetic layer is a rare earth metal-iron type magnetic powder of substantially spherical or ellipsoidal particles comprising a rare earth element and iron or a transition metal which comprises iron, and has a number average particle size 5 to 50 nm and an average axis ratio of 1 to 2, and the total thickness of the magnetic recording medium is less than 6 μm. This magnetic recording medium can achieve an excellent block error rate, which cannot be realized with magnetic recording media comprising conventional acicular magnetic powders.
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Doi Tsugihiro
Inoue Tetsutaro
Kishimoto Mikio
Kuse Sadamu
Sasaki Yuji
Bernatz Kevin M.
Birch & Stewart Kolasch & Birch, LLP
Hitachi Maxell Ltd.
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