| 摘要 |
PURPOSE:To obtain a magnetic recording medium contg. well dispersed magnetic powder and having satisfactory surface smoothness and durability by forming a magnetic layer contg. a specified binder, a specified ester compd. as a lubricant, a specified coupling agent and ferromagnetic fine powder and by irradiating the magnetic layer. CONSTITUTION:A binder contg. a specified compd. having (meth)acrylic unsatd. bonds such as a compd. represented by formula I, magnetic powder surface- treated with a specified coupling agent and a specified phosphoric ester such as a compd. represented by formula III and a specified ester compd. such as a compd. represented by formula II are incorporated into a magnetic layer. In the formula II, each or R4 and R5 is 1-25C straight chain or branched satd. alkyl group and R6 is 7-29C straight chain or branched (un)satd. alkyl group. In the formula III, R is 2-28C hydrocarbon or acyl group, Q is 2-4C alkylene group, (q) is 0 or an integer of 1-30 and L is 1, 1.5 or 2. The components are easily converted into a magnetic coating material having superior dispersibility and stability. When the coating material is applied, a magnetic layer having superior smoothness is formed.
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