| 摘要 |
PURPOSE:To eliminate powder dislodgment in a calendar process by subjecting a magnetic layer to a calender treatment at the temp. below the m.p. of a lubricating agent having the highest m.p. to be incorporated into the magnetic layer. CONSTITUTION:The magnetic layer of a magnetic recording medium is subjected to the calender treatment at the temp. below the highest m.p. among the m.p. of the lubricating agents to be contained in said layer. The lubricating agents preferably contain at least one kind selected from the lubricating agent group consisting of higher fatty acids such as polyolefin wax, satd. straight chain fatty acid and unsatd. fatty acid, aliphat. alcohol and fatty acid amide having >=80 deg.C m.p. The generation of the powder dislodgement from the surface of metallic rolls is thereby prevented and the uniformly smooth magnetic layer is obtd.
|
