MAGNETIC POWDER AND METHOD OF MANUFACTURING THE SAME, AND ITS USAGE

摘要

An aspect of the present invention relates to a method of manufacturing magnetic powder, which comprises adding an alkali metal salt compound comprising a substituent selected from the group consisting of an alkali metal salt of a carboxyl group and an alkali metal salt of a hydroxyl group to a water-based magnetic liquid comprising magnetic particles dispersed in an acidic water-based solvent to cause the magnetic particles to aggregate in the water-based magnetic liquid; and collecting the aggregated magnetic particles to obtain the magnetic powder.

主权项

1. A method of manufacturing a magnetic recording medium, which comprises:
manufacturing magnetic powder by a manufacturing method comprising: adding an alkali metal salt compound comprising a substituent selected from the group consisting of an alkali metal salt of a carboxyl group and an alkali metal salt of a hydroxyl group to a water-based magnetic liquid comprising magnetic particles dispersed in an acidic water-based solvent to cause the magnetic particles to aggregate in the water-based magnetic liquid; and collecting the aggregated magnetic particles to obtain the magnetic powder; dispersing the magnetic powder that has been manufactured together with an organic solvent and a binder to prepare a magnetic coating material; and forming a magnetic layer with the magnetic coating material that has been prepared.