| 摘要 |
PURPOSE:To improve simultaneously both surface property and durability of the titled recording medium by incorporating at least 1 kind among a fatty acid, a fatty acid amide, a fatty acid-modified silicone and an alpha-olefin oxide into the magnetic layer contg. non-magnetic powder. CONSTITUTION:More than 3wt%, based on ferromagnetic powder, non-magnetic powder having >=6 Moh's hardness and >=7wt% at least 1 kind selected from a fatty acid, a fatty acid amide, a fatty acid ester, a fatty acid-modified silicone and an alpha-olefin oxide are incorporated into a magnetic layer. Cr2O3, alumina, SiO, MgO, etc. which are usually called an abrasive and capable of improving the durability can be used, the size of the particle is most preferably regulated to 0.2-0.7mu, and the amt. of the abrasive to be used is optimally controlled to 6-15wt%, based on the ferromagnetic powder.
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