| 摘要 |
PURPOSE:To prevent intrusion of medium powder into a magnetic paint and to obtain an excellent magnetic recording medium by using balls, etc. consisting of TiO2 as a medium for a high-speed medium stirring type mill to mix and disperse the paint contg. magnetic metallic powder and nonmagnetic powder having specific hardness or above. CONSTITUTION:Balls and beads consisting of TiO2 are used for the medium of the high-speed medium stirring type mill in the stage of using said mill for mixing and dispersing the magnetic paint contg. the powder of the magnetic metal such as Fe, Co or the like or the alloy thereof and the nonmagnetic powder such as alumina powder, chromium oxide powder or the like having >=6 Mohs' hardness. The TiO2 has 3.3 specific gravity and >=6 hardness and hardly cracks and forms abrasive powder. The intrusion of said powder into the magnetic paint is thus decreased and even if the balls or beads wear slightly and mix in the paint, the worn powder functions in the same way as the non-magnetic powder of the paint component and therefore the magnetic recording medium having excellent electromagnetic transducing characteristics is obtd. by using said paint.
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