Magnetic recording media
AssigneeHitachi, Ltd.
InventorsHeigo Ishihara, Tomoyuki Ohno
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Abstract
The invention provides magnetic recording media such as magnetic disks, etc., with an improved lubricant composition of perfluoroalkylpolyether with a polar terminal group and perfluoroalkylpolyether without a polar terminal group on the surfaces.
Claims10
Magnetic recording medium having a lubricating film thereon which comprises a lubricating film containing polar perfluoroalkylpolyether with a polar terminal group and a nonpolar perfluoroalkylpolyether without a polar terminal group being laid on the surface of a magnetic recording medium having a magnetic layer comprising a film formed of a material selected from the group consisting of a magnetic metal, a magnetic oxide and magnetic powders dispersed in a thermosetting binder;
- a coating weight of the polar and non-polar perfluoroalkylpolyethers on the surface of the magnetic recording medium being 10 to 100 mg/m.sup.2, and a ratio of coating weight of the nonpolar perfluoroalkylpolyether to that of the polar perfluoroalkylpolyether being 0.5-4:1.
Magnetic recording medium having a lubricating film thereon which comprises a lubricating film containing polar perfluoroalkylpolyether with a polar terminal group and a nonpolar perfluoroalkylpolyether without a polar terminal group, being laid on a surface of a magnetic recording medium having a magnetic layer comprising a film formed of a material selected from the group consisting of a magnetic metal, a magnetic oxide and magnetic powders dispersed in a thermosetting binder;
- a ratio of coating weight of the nonpolar perfluoroalkylpolyether to that of the polar perfluoroalkylpolyether being in a range such that a protective layer adhesive to the magnetic medium is obtained and a sliding strength is achieved which is greater than that obtained by the use of either polar or nonpolar perfluoroalkylpolyether alone.
Dependencies are inferred from the claim text.