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Magnetic recording medium which includes a protective layer, an adhesion strengthening substance and a lubricant layer
| Details |
Inventors: Kokaku, Yuichi; Matsunuma, Satoshi; Fujimaki, Shigehiko; Kitoh, Makoto; Furusawa, Kenji;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner: Cashion, Jr.; Merrell C.
Assistant Examiner: Resan; Stevan A.
Attorney, Agent or Firm: Fay, Sharpe, Beall, Fagan, Minnich & McKee
The magnetic recording medium of the present invention comprises (a) a non-magnetic substrate, (b) a magnetic recording layer containing at least one ferromagnetic substance on at least one side of the substrate, (c) a protective layer the magnetic recording layer, and (d) a lubricant layer on the protective layer, wherein an adhesion-strengthening substance which is at least one member selected from the group consisting of metals and metal compounds is distributed substantially uniformly on the layer (c) at the interface between the layer (c) and the layer (d) so as not to cover the whole surface of the layer (c) and so as to contact also with the layer (d). |
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DETAILED DESCRIPTION The present inventors made in-depth investigation on the relationship between the friction and abrasion properties of magnetic recording medium and the lubricant used therein (particularly, its coating method, state after coating, amount coated).
As a result, it was found to be most effective for the longer life of magnetic recording medium that a lubricant is adsorbed on a protective film uniformly in a sufficient amount at a sufficiently high bonding strength by means of chemical adsorption or the like and not by covalent bonding, without substantially changing the properties required for protective film.
When the bonding strength between the protective film and the lubricant is high, shortage of lubricant is less likely to occur and, even if it occurs, can be remedied by readsorption of lubricant.
It was also found that the high bonding strength between the protective film and the lubricant can be obtained by allowing an element other than carbon, particularly a metal element or its compound to exist on the protective film surface and then allowing a lubricant to be adsorbed on the surface via the element or compound.
It was further found that in order to achieve this without sacrificing the properties of the protective film, it is effective to allow said element or compound to exist on the protective film surface in a mixed state with the protective film material.
According to the present invention, there are provided a magnetic recording medium comprising (a) a non-magnetic substrate, (b) a magnetic recording layer containing at least one ferromagnetic substance on at least one side of the substrate, (c) a protective layer on the magnetic recording layer, and (d) a lubricant layer on the protective layer, wherein an adhesion-strengthening substance which is at least one member selected from the group consisting of metals and metal compounds, is distributed substantially uniformly on the layer (c) at the interface between the layer (c) and the layer (d) so as not to cover the whole surface of the layer (c) and so as to contact also with the layer (d); processes for producing said medium; and apparatuses using said medium
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