Title:
NONMAGNETIC PARTICLE POWDER FOR NONMAGNETIC UNDERLAYER OF MAGNETIC RECORDING MEDIUM, AND MAGNETIC RECORDING MEDIUM
Document Type and Number:
Japanese Patent JP2011014188
Kind Code:
A
Abstract:
To provide nonmagnetic particle powder for a nonmagnetic underlayer of a magnetic recording medium, which is excellent in dispersibility in a coating for the nonmagnetic underlayer and in a filling property in the nonmagnetic underlayer.
The nonmagnetic particle powder is composed of hematite particle powder or water-containing iron oxide particle powder the axial ratio (a ratio of a long axis diameter to a short axis diameter) of which is less than 2.0 and the tap density (ρt) of which is 0.60 g/cm3 or more. The magnetic recording medium uses the nonmagnetic particle powder as the nonmagnetic particle powder for the nonmagnetic underlayer of the magnetic recording medium.
Inventors:
ISHITANI SEIJI
NISHIKAWA HIROFUMI
MORII HIROKO
HAYASHI KAZUYUKI
NISHIKAWA HIROFUMI
MORII HIROKO
HAYASHI KAZUYUKI
Application Number:
JP2009155965A
Publication Date:
January 20, 2011
Filing Date:
June 30, 2009
Export Citation:
Assignee:
TODA KOGYO CORP
International Classes:
G11B5/738
Domestic Patent References:
| JPH1069627A | 1998-03-10 | |||
| JP2004079004A | 2004-03-11 | |||
| JPH1069629A | 1998-03-10 | |||
| JP2001067649A | 2001-03-16 | |||
| JPH1069627A | 1998-03-10 | |||
| JP2004079004A | 2004-03-11 |