| 摘要 |
The invention provides a magnetic recording medium which is reduced in the occurrence of a dropout and has excellent durability.The magnetic recording medium comprises a magnetic layer on one surface of a non-magnetic support and a back-coat layer, containing mainly a non-magnetic powder and a binder, on the other surface. The back-coat layer includes (a) a carbon black having an average particle size of 15 to 25 nm, (b) a carbon black having an average particle size of 60 to 80 nm and (c) CaCO3 and/or BaSO4 having an average particle size of 30 to 75 nm as the non-magnetic powder. The back-coat layer preferably includes said carbon black (a), said carbon black (b) and said CaCO3 and/or BaSO4 (c) in a ratio of (a)/(b)/(c)=60-80/3-15/15-30 by weight.
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