| 摘要 |
A magnetic recording medium of the present invention comprises:a non-magnetic base film;a non-magnetic undercoat layer formed on said non-magnetic base film, comprising a binder resin and non-magnetic acicular black iron-based composite particles; anda magnetic coating film comprising a binder resin and magnetic particles,said non-magnetic acicular black iron-based composite particles comprising: acicular hematite particles or acicular iron oxide hydroxide particles having an average major axis diameter of 0.02 to 0.30 mum; a coating layer formed on the surface of said acicular hematite particle or acicular iron oxide hydroxide particle, comprising a specific organosilicon compound; and a carbon black coat formed on said coating layer.Such a magnetic recording medium has a more smooth surface, a high strength and a lower light transmittance and a low electric resistance even at a small carbon black content.
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