MAGNETIC RECORDING MEDIUM
PURPOSE:To obtain the titled magnetic recording medium having excellent antistatic and traveling properties by electrifying positively the surface of the magnetic layer in the magnetic recording medium wherein hexagonal-system ferromagnetic powder is incorporated as the magnetic powder. CONSTITUTION...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | PURPOSE:To obtain the titled magnetic recording medium having excellent antistatic and traveling properties by electrifying positively the surface of the magnetic layer in the magnetic recording medium wherein hexagonal-system ferromagnetic powder is incorporated as the magnetic powder. CONSTITUTION:The following methods are exemplified to electrify the surface of a magnetic layer. Firstly, magnetic powder which is easy to be positively electrified is selected from hexagonal-system magnetic powder, and used as the magnetic powder. Secondly, inorg. powder having a positively electrifiable property, a surfactant capable of providing a positively electrifiable property, and an electrification controlling agent are added into a magnetic paint or dispersed in the magnetic paint. Thirdly, a magnetic paint is coated on a positively electrified base body. Fourthly, the pH of a magnetic paint is regulated and made higher than the isoelectric point to electrify positively the surface of the magnetic layer. The methods are applied separately, or a combination of the methods is applied. |
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