Magnetic recording medium
AssigneeSony Corporation
InventorsKaoru Nakajima, Kunio Kobayashi, Yoshiaki Hisagen
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Abstract
A magnetic recording medium having low friction coefficient and superior in aging characteristics is disclosed. The magnetic recording medium is provided with a lubricant which is strongly bonded to the magnetic recording medium by a bombardment of an electron beam. In one embodiment, the lubricant containing a molecular chain having a lubricating property, and a double bond sensitive to dissociation products such as free radicals are coated on a magnetic layer and then electron beam irradiates the magnetic layer. A radical reaction then occurs causing a covalent bond of the lubricant to the magnetic recording layer.
Claims17
In a magnetic recording medium of the type in which a magnetic recording layer composed of finely divided magnetizable pigment dispersed in a binder is formed on a major surface of a flexible, non-magnetic substrate, wherein the improvement comprises:
- a plurality of molecular chains selected from the group consisting of an aliphatic hydrocarbon group containing 7 to 21 carbon atoms and an aliphatic fluorocarbon containing 3 to 15 carbon atoms having a lubricating property are strongly bonded to a surface of the magnetic recording medium by irradiation of the molecular chains and the magnetic recording medium,
- whereby free radical reactions strongly bond the lubricating molecular chains to said surface of the magnetic recording medium.
Dependencies are inferred from the claim text.