Title:
MAGNETIC RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2001/001402
Kind Code:
A1
Abstract:
A magnetic recording medium having a non-magnetic substrate and a magnetic layer formed thereon through applying a magnetic liquid containing a ferromagnetic powder, characterized in that the non-magnetic substrate has a surface roughness of the face having the magnetic layer thereon of 1 to 6 nm in terms of average center line roughness Ra, the ferromagnetic powder has a specific surface area according to the BET method of 30 m?2¿/g or more, and the magnetic layer has a thickness of 0.1 to 0.5 $g(m)m, contains a lubricating agent (1) comprising a higher fatty acid or a fatty acid derivative in an amount of 10 to 25 parts relative to 100 parts of the ferromagnetic powder and an electrically conductive non-magnetic powder having an average particle diameter of 0.1 $g(m)m or less for carrying the lubricating agent (1) and is coated and impregnated with a lubricating agent (2) comprising a fluorine-containing lubricant. A magnetic recording medium having an elastic supporter and, formed thereon, a magnetic layer comprising a ferromagnetic powder and a binder as main components, characterized in that the magnetic layer contains, as a fabricating agent, an ester compound (A) derived from a fatty acid having 3 or more branches and 9 to 18 carbon atoms and an alcohol having 3 or more branches and 8 to 17 carbon atoms.
Inventors:
IKEDA TAKUYA (JP)
HASIMOTO EIICHI (JP)
HASIMOTO EIICHI (JP)
Application Number:
PCT/JP2000/004211
Publication Date:
January 04, 2001
Filing Date:
June 27, 2000
Export Citation:
Assignee:
TEIJIN LTD (JP)
IKEDA TAKUYA (JP)
HASIMOTO EIICHI (JP)
IKEDA TAKUYA (JP)
HASIMOTO EIICHI (JP)
International Classes:
C10M105/22; C10M105/34; C10M107/32; G11B5/708; G11B5/71; (IPC1-7): G11B5/71; C10M105/22; C10M105/34; C10M107/32; G11B5/708; G11B5/842
Foreign References:
| JPH10275327A | 1998-10-13 | |||
| JPH04159248A | 1992-06-02 | |||
| EP0869482A1 | 1998-10-07 | |||
| JPH04186523A | 1992-07-03 | |||
| JPH07153062A | 1995-06-16 | |||
| JPH05174363A | 1993-07-13 | |||
| JPS6484432A | 1989-03-29 | |||
| JPH07296370A | 1995-11-10 | |||
| JPH0689426A | 1994-03-29 | |||
| JPH07320254A | 1995-12-08 |
Attorney, Agent or Firm:
Maeda, Sumihiro (Intellectual Property Center 1-1 Uchisaiwaicho
2-chome Chiyoda-ku, Tokyo, JP)
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