| 摘要 |
PURPOSE:To apply a heat-resisting component, a magnetism adjusting component, an anti-oxidizing component, etc. uniformly on the surfaces of crystal grains as the precursors of magnetic powder for magnetic recording, and to obtain powder having excellent magnetic characteristics by applying these components under the state of slurry by using a high-speed sispersion agitator when these components are applied on the surfaces of the crystal grains. CONSTITUTION:When a heat-resisting component, a magnetism adjusting component, an anti-oxidizing component, etc. are applied on the surfaces of crystal grains as the precursors of magnetic powder for recording, magnetic paints mentioned below are prepared to a slurry state and applied on a polyester base, oriented magnetically, and smoothed by a calender roll. That is, sixty pt. magnetic powder, a fifteen pt. vinyl chloride-vinyl acetate copolymer, five pt. polyurethane resin, a 0.7pt. surface-active material, each seventy-five pt. methyl ethyl ketone and methyl isobutyl ketone and a two pt. lubricant are mixed and brought to the state of slurry, turned at peripheral speed of 3-30m/sec, passed through a clearance in a high-speed dispersion agitator in which a clearance between a turbine and a stator is brought to 0.1-2mm., and applied on a film. |
