| 摘要 |
PURPOSE:To obtain a recording a medium having good running performance and durability by using a biaxially oriented PE-2, 6-naphthaline dicarboxylate film which has prescribed characteristics and has <=50% degree of crystallization as a base film provided with a magnetic layer on the surface. CONSTITUTION:The base film which has >=15kg/mm<2> stress at 5% elongation in the longitudinal direction, >=650kg/mm<2> Young's modulus in the longitudinal direction and >=500kg/mm<2> Young's modulus in the transverse direction and in which the sum of said Young's moduli is in a 1,400-2,100kg/mm<2> range is used. The biaxially oriented PE-2, 6-naphthaline dicarboxylate film which has >=4% thermal shrinkage in the longitudinal direction at 150 deg.C, <=8% thermal shrinkage in the transverse direction and <=50% degree of crystallization is used. The magnetic recording medium which is a magnetic recording medium having the good electromagnetic conversion characteristic and the extremely good running performance and durability of the tape and is suitable for a VTR to permit long-time high-density recording in particular is thereby obtd. |
