Patent ID: 6051308
Filing Date: 2000-04-18
Classification: G11B,Y10S,Y10T

Abstract:
A magnetic recording medium, comprising:a flexible non-magnetic support, a non-magnetic primer layer containing a binder and non-magnetic carbon black particles, formed on the support, and a magnetic layer having a thickness of at most 0.5 .mu.m and comprising a binder and a ferromagnetic acicular metal powder having an average long axis length (L) of at most 0.20 .mu.m and an aspect ratio (K) of at most 15, formed on the primer layer, wherein the binder of the non-magnetic primer layer is the same as the binder of the magnetic layer, this common binder being absorbable on the carbon black of the non-magnetic layer in an amount larger than on the ferromagnetic acicular metal powder of the magnetic layer, wherein the variation (D) of the interface between the magnetic layer and the non-magnetic primer layer is represented by: D.ltoreq.2L/K.