| 摘要 |
PROBLEM TO BE SOLVED: To provide a base material suitable for manufacturing magnetic recording medium having few number of dropouts (DOs) and excellent running durability, especially a DVC-LP tape. SOLUTION: In the base material for the magnetic recording medium, a reinforcing film consisting of a material selected from the oxide of a metal, the oxide of a semimetal, a semimetal and the composite consisting of those and a metal is formed on the surface B on one side of a polyester film, the other surface A has 1-5 nm Ra value and the substrate has a thickness of 2-6μm, Young's moduli in the longitudinal and the lateral directions of >=5,500 MPa and >=7,500 MPa, respectively, and an infrared ray transmittance of >=70%.
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