FUSIFORM IRON OXIDE GRANULE AND ITS PRODUCTION

PURPOSE: To obtain fusiform iron oxide granules having high fillability, high coercive force and narrow coercive force distribution and fit to produce a magnetic recording medium having satisfactory surface properties. CONSTITUTION: Fusiform iron oxide hydrate powder or fusiform iron oxide powder ha...

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Bibliographische Detailangaben
Hauptverfasser: IKEGUCHI MASAAKI, FUJII SHIGEO
Format: Patent
Sprache:eng
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Zusammenfassung:PURPOSE: To obtain fusiform iron oxide granules having high fillability, high coercive force and narrow coercive force distribution and fit to produce a magnetic recording medium having satisfactory surface properties. CONSTITUTION: Fusiform iron oxide hydrate powder or fusiform iron oxide powder having 0.05-0.3μm major axis size of primary particles and an axial ratio of 4-12 is granulated to obtain the objective fusiform iron oxide hydrate granules or fusiform iron oxide granules having 1-20mm average diameter and 0.15-0.4g/cm bulk density.