Patent ID: 6803104
Filing Date: 2004-10-12
Classification: B82Y,C01P,C09C,G11B,Y10T

Abstract:
A magnetic recording medium comprising:a non-magnetic base film; a non-magnetic undercoat layer formed on said non-magnetic base film, comprising a binder resin myristic acid, butyl stearate and non-magnetic acicular black iron-based composite particles; and a magnetic coating film formed on said non-magnetic undercoat layer, comprising a binder resin and magnetic particles, said non-magnetic acicular black iron-based composite particles having an average major axis diameter of about 0.011 to 0.35 &mgr;m, comprising: acicular hematite particles or acicular iron oxide hydroxide particles; a coating layer formed on the surface of said acicular hematite particle or acicular iron oxide hydroxide particle, comprising at least one organosilicon compound selected from the group consisting of: (1) organosilane compounds obtained from an alkoxysilane compounds, and (2) polysiloxanes or modified polysiloxanes; and a single carbon black coat formed on at least a part of said coating layer comprising said organosilicon compound, in an amount of 21 to 50 parts by weight based on 100 parts by weight of said acicular hematite particles or acicular iron oxide hydroxide particles.