| 摘要 |
PURPOSE:To contrive the formation of a thinner protective film suitable for high-density recording and the reduction of a cost and the enhancement in durability and corrosion resistance by forming a polyimide film on the surface of the magnetic layer of a magnetic recording medium and further, providing a solid or liquid lubricating agent thereon. CONSTITUTION:The polyimide is provided on a thin magnetic metallic film provided on a substrate and further, the solid or liquid lubricating agent is provided thereon. Namely, the polyimide film is formed by coating and calcining of a polyamid acid soln. on the thin magnetic metallic film provided on the substrate and thereafter, the solid lubricating agent such as higher fatty acid or the metal salt thereof or higher alcohol, etc. or the liquid lubricating agent such as fluorine or silicone is coated thereon. The water resistance (prevention of corrosion of the magnetic layer by moisture) of the magnetic recording medium provided with the polyimide film is large and, therefore, the formation of the thinner film is possible and the role to the high density recording is large. |
