Magnetic recording medium and production method thereof
AssigneeVerbatim Corporation
InventorOsamu Shimomura
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Abstract
A magnetic recording medium is formed on a non-magnetic support and a magnetic layer containing a binder and a ferromagnetic powder and having a thickness of 0.7 μm or thinner is formed on the non-magnetic support wherein the surface roughness Ra of the surface of the medium is from 0.5 to 7 nm and the skewness RSK of the surface of the medium is 0.1 or lower. The magnetic recording medium preferably has a nonmagnetic underlayer containing a binder and non-magnetic particles such as carbon black, between the non-magnetic support and the magnetic layer. The magnetic recording medium has excellent electromagnetic recording characteristics and torque characteristics and is suitable for high-density recording.
Claims20
A magnetic recording medium comprising:
- a non-magnetic support including a non-magnetic layer formed thereon containing a binder and non-magnetic particles including carbon black in a ratio by weight of about 2 to 50 parts binder to 100 parts non-magnetic particles;
- and
- a magnetic layer formed on the non-magnetic layer containing a binder and a ferromagnetic powder and having a thickness not greater than about 0.7 μm, wherein the surface roughness Ra of the surface of the magnetic recording medium is in the range from 0.5 to 7 nm and the skewness RSK of the surface of the magnetic recording medium is 0.1 or lower.
Dependencies are inferred from the claim text.