| 摘要 |
PURPOSE: To provide a satisfactory magnetic recording medium having high electromagnetic transducing characteristics and high mechanical strength. CONSTITUTION: Magnetic powder is iron nitride powder having 160-210emu/g saturation magnetizationσs , 1,500-2,500Oe coercive force, an acicularity ratio of 5-15 and 0.05-0.15μm major axis size. One to four kinds among a vinyl chloride copolymer, a vinyl chloride-vinyl acetate copolymer, polyester resin and urethane resin are used as binders. These binders contain amino groups, methylol groups, carboxyl groups, acid amido groups, isocyanato groups, metallic sulfonate groups, phosphate groups, quat. ammonium salt groups, sulfobetaine groups and epoxy groups as functional groups.
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