Patent ID: 6143403
Filing Date: 2000-11-07
Classification: G11B,Y10S,Y10T

Abstract:
A magnetic recording medium, comprising:a support;at least two layers comprising a lower non-magnetic layer disposed at one side of the support, the lower non-magnetic layer comprising a non-magnetic powder and a binder, and an upper magnetic layer disposed over the lower non-magnetic layer, the upper magnetic layer comprising a ferromagnetic powder and a binder; anda back layer at the other side of the support, the back layer comprising carbon black and a binder,wherein the upper magnetic layer has an average dry thickness (d) of 1.0 .mu.m or less; the non-magnetic powder contained in the lower non-magnetic layer is a non-magnetic inorganic powder having a Mohs hardness of 3 or more; and the back layer has a surface free energy of 10 to 100 dyne/cm.