| 摘要 |
PURPOSE:To enhance traveling stability, by forming a magnetic layer on the front face of a nonmagnetic support and on the opposite side forming a back coat layer contg. fine particles including at least grainy ones of magnetite. CONSTITUTION:Fine magnetite particles of 0.01-0.5mum diameter are prepared by the coprecipitation method, the method of reduction of alpha-Fe2O3 or gamma-Fe2O3, or that of oxidation of iron powder. the magnatic layer may comprise any of magnetic iron oxide, chromium dioxide, and metallic magnetic powder. As abrasive added when needed, a high hardness fine powder, such as Cr2O3 or alumina, is used, and carbon black or graphite particles are used for an antistatic agent. An organic solvent, such as methyl ethyl ketone or toluene, is used. The back coat layer is formed before and after formation of the magnetic layer, or after calender treatment, or the like. |
