PURPOSE: To solve problem due to the electrification of the surface of a magnetic recording medium without reducing the output of the medium by coating the surfaces of γ-Fe2O3 particles or Co stuck γ-Fe2O3 particles with an electric conductive polymer.
CONSTITUTION: The surfaces of γ-Fe2O3 particles or Co stuck γ-Fe2O3 particles are coated with an electric conductive polymer to impart electric conductivity to the particles and the objective powder for magnetic recording is obtd. The electric conductive polymer is polyacetylene, polypyrrole, polythiophene, polyaniline, polyphenylene sulfide or a mixture of two or more among them. Since the surfaces of the magnetic particles are coated with the electric conductive polymer, the electric conductivity of the magnetic particles is considerably enhanced.
SHIBUYA KOJI