Magnetic recording medium

Abstract

Abstract PURPOSE:To obtain a magnetic recording medium which is suitable for the recording of high density like the vertical magnetic recording, etc. with improved dispersibility, by using the hexagonal ferrite magnetic powder coated with an oxide and/or a hydroxide showing the alkalinity on the surface. CONSTITUTION:An oxide and/or a hydroxide of a metal showing the alkalinity such as Ca, Mg, Ba, Sr, Al, Zn, etc. are coated on the surface of the hexagonal ferrite powder. This hexagonal ferrite powder which has received a surface treatment is dispersed along with the binder resin to a dispersant and then coated on the surface of a substrate. Then the substrate is dried up with the orientation given to the magnetic field when necessary. Thus a magnetic recording medium is obtained.

Inventors

• 👤 Tadashi Ido
• 👤 井戸　忠
• 👤 Toshihiko Oguchi
• 👤 小口　寿彦
• 👤 Hirohisa Kato
• 👤 博久 加藤

Bibliographic Details