| 摘要 |
PURPOSE:To obtain a metallic thin film magnetic recording medium which has superior strength, size stability, and heat resistance, less dropouts after being made into a magnetic tape, and superior run performance and electric characteristics by specifying the properties of a film or sheet type nonmagnetic base made of a crystalline high polymer material. CONSTITUTION:The nonmagnetic base uses a film obtained by drawing the film made of the crystalline high polymer material which has a >=120 deg.C secondary dislocation point and a >=280 deg.C fusion point. For example, the mean surface roughness (CLA) of the surface of the base is <=0.08mum, maximum projection height (PV) is <=0.5mum, and the numbers of projections which are 0.27-0.54mum high is 0.2/mm.<2>. In this case, noises after the film is made into the metallic thin film magnetic recording medium are reduced greatly and the noise level is very superior. Further, a solution obtained by dispersing a lubricant in water or a solvent is applied to form a lubricant layer so as to give slidability to the reverse surface of the surface where a ferromagnetic metallic film is formed.
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