| 摘要 |
<p>PURPOSE:To obtain a magnetic recording medium having a superior performance and durability especially suitable for VTR, by forming a magnetic layer contg. an acicular ferromagnetic metallic powder having coercive force and specific surface area both not below specified values, and a resin having specified polar groups in a specified proportion or more. CONSTITUTION:A fine powder of acicular ferromagnetic metal having >=1,000Oe coercive force and >=45m<2>/g measured by the BET method is added to a magnetic coating material together with a binder resin contg. >=50wt% resin having at least one kind of polar groups of -SO3M, -SO2M, and -COOM (M is H, Li, Na, or K) and a polar group of the shown formula (M1, M2 are each same as A or alkyl). The presence of said polar group-contg. resin improves uniform dispersibility of the magnetic without raising viscosity of the coating material too much. As a result, the obtained magnetic tape has superior surface property, magnetic characteristics, and durability, and aptitude for VTR.</p> |
