Iron oxide powder for undercoat layer of coat-type magnetic recording medium having multilayer structure and a process of producing the same
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United States of America Patent
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Issued Date -
Jun 9, 2005
app pub date -
Sep 7, 2004
filing date -
Aug 23, 2002
priority date (Note) -
Abandoned
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Abstract
Iron oxide powder for an undercoat layer of a coat-type magnetic recording medium having a multilayer structure which comprises cobalt-doped iron oxide particles having an average length of 0.02 to 0.3 .mu.m, an aspect ratio (length to width ratio) of 2 to 13, and a BET specific surface area of 40 to 100 m.sup.2/g, containing a cobalt compound in an amount of 0.2 to 10 atom % in terms of cobalt based on total iron, and having a pH of 6 to 8, a soluble cation content of 50 ppm or less, and a soluble anion content of 50 ppm or less.
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