| 摘要 |
<p>A magnetic recording medium having no interlayer adhesion and a low friction. Provided is a back layer capable of providing the magnetic recording medium having a good travelling performance, by combining conductive carbons with each other, whose specific surface areas and DBP oil absorptions are different from each other, and by adjusting the mixing ratio of the whole carbon to a binder. In a magnetic recording medium having a magnetic layer on one side of a non-magnetic support and a back layer including carbon black, an inorganic powder, and a binder on the opposite side, the carbon black is a mixture of the one of 20-80 m2/g in specific surface area and 120-200 ml/100 g in DBP oil absorption, and the one of 600-900 m2/g in specific surface area and 180-250 ml/100 g in DBP oil absorption, and the mixture ratio of the two kinds of the carbon blacks is within the range of from 8:2 to 9.5:0.5, and further, the ratio of the whole quantity of the carbon black to the binder is 35-75 weight %, preferably 40-70 weight %.</p> |
