| 摘要 |
PURPOSE:To improve the oxidation-resistant property of metal magnetic powder by a method wherein the surface of the metal magnetic powder is modified conjointly using a specific compound and phenylpropanoid, and the surface is bonded. CONSTITUTION:The surface of the title metal magnetic powder is modified at least using a kind of compound X indicated by the general formula A- (COOH)2, A- (CO)2O or A- (OH)2 (provided that A in the formula indicates a phenyl radical, a cyclohexyl radical or a naphthyl radical, and a substitute may be used), and also using at least a kind of pheylpropanoid. The title magnetic recording medium is provided with a magnetic layer 2, containing metal magnetic powder and a bonding agent, formed by coating on one surface of a non-magnetic supporting member 1, and a back coat formed on other surface of the supporting member 1 using non-magnetic powder and a bonding agent. Phthalic acid and 1,2 cyclohexanecarboxylic acid are enumerated as the compound X, and cinnamic acid, phenylacanine and the like are enumerated as phenylpropanoid. As a result, the oxidation-resistant property of the metal magnetic powder can be improved without deterioration of magnetic characteristics. |
