| 摘要 |
PURPOSE:To obtain a magnetic recording medium having good light shielding property, low friction and excellent traveling property and durability by providing magnetic layers comprising the uppermost layer and at least one layer on a nonmagnetic supporting body and specifying the amt. of carbon black incorporated into each magnetic layer. CONSTITUTION:The magnetic layer consists of the uppermost magnetic layer 4 and other magnetic layers, e.g. lower magnetic layer 2 provided on a nonmagnetic supporting body 1. The opposite side of the supporting body 1 to the magnetic layer is covered with a back coating layer 3 containing carbon black as the main filler. The amt. of carbon black in the uppermost layer 4 is specified to 0.1-0.5 wt.% of the amt. of magnetic powder in the uppermost layer 4. The amt. of carbon black in the layer 2 except for the uppermost layer is specified to <=0.4 wt.% of the amt. of magnetic powder contained in the layer. (In case of two or more layers, the amt. of carbon black in each layer is <=0.4 wt.% to the magnetic powder in the respective layer.) |
