Stock material or miscellaneous articles – Magnetic recording component or stock – Binder media
Reexamination Certificate
2008-04-15
2008-04-15
Bernatz, Kevin M. (Department: 1794)
Stock material or miscellaneous articles
Magnetic recording component or stock
Binder media
C428S402000
Reexamination Certificate
active
07357997
ABSTRACT:
A powder for an underlayer of a coating-type magnetic recording medium comprises acicular iron oxide particles having an average major axis length in the range of 20-200 nm, has a specific surface area measured by the BET method of 30-100 m2/g and has a powder pH of not greater than 7. The underlayer powder preferably contains 0.1-5.0 wt. % of P and optionally contains an amount of R (where R represents one or more rare earth elements, defined as including Y) such that R/Fe expressed in atomic percentage (at. %) is 0.1-10 at. %. The iron oxide powder enhances the properties required of a powder for forming the underlayer of a multi-layer structure coating-type magnetic recording tape, most notably the surface smoothness and strength of the tape.
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Inoue Ken
Inoue Ken-ichi
Matsumoto Kazuyuki
Bernatz Kevin M.
Clark & Brody
Dowa Electronics Materials Co., Ltd.
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