| abstract |
A magnetic recording medium comprises:n (a) a non-magnetic base film; (b) a non-magnetic undercoat layer on said non-magneticnbase film, comprising a binder resin and non-magneticnacicular black iron-based composite particles;nand (c) a magnetic coating film comprising a bindernresin and magnetic particles, comprisingn acicular hematite or iron oxide hydroxidenparticles having an average major axis diameter of fromn0.02 to 0.30 µm, a coating layer on the surface of said acicularnhematite or iron oxide hydroxide particles, comprising atnleast one organosilicon compound selected from:n (1) organosilane compounds obtainable by drying ornheat-treating alkoxysilane compounds, (2) polysiloxanes or modified polysiloxanes, and (3) fluoroalkyl organosilane compounds obtainable byndrying or heat-treating a fluoroalkylsilane compounds,nand from 1 to 20 parts by weight, per 100 parts bynweight of said acicular hematite or iron oxide hydroxidenparticles, of carbon black particles which have anparticle size of from 0.002 to 0.05 µm and which arenadhered to at least a part of said coating layer. |