| 摘要 |
PURPOSE:To lower the coefft. of kinematic friction of a magnetic recording medium by incorporating a specified nonmagnetic substance and a specified Si compound into the back coat layer. CONSTITUTION:A layer contg. a nonmagnetic substance having >=about 5 Mohs' hardness such as alpha-Fe2O3 and a compound represented by the formula is formed on one side of a support having a magnetic layer on the other side. In the formula, R1 is 7-21C (un)satd. univalent hydrocarbon, R2 is 1-4C satd. univalent hydrocarbon, k is an integer of 1-12, l is an integer of 2-6, m=1 or 2, n=1 or 2, and m+n<=3. By the structure, a recording medium having a low coefft. of kinematic friction and satisfactory traveling performance can be obtd.
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