| 摘要 |
PURPOSE:To obtain a magnetic recording medium having a high modulus of elasticity, superior mechanical strength and durability by preparing a magnetic coating material with a liq. acrylic oligomer and cellulosic resin as binder components and a small amount of an org. solvent. CONSTITUTION:A magnetic layer contg. dipentaerythritol hexaacrylate, the ester of dipentaerythritol with pentaacrylic acid or lower, cellulose resin and magnetic powder is formed. An acrylic oligomer prepd. by mixing the hexaacrylate with the ester is liq. and has many double-bond groups per one molecule, so a magnetic coating material can be prepd. with a small amount of a solvent, and high cross-linking density is attained by polymn. and curing under radiation. The cellulose resin has a great affinity for the magnetic powder and disperses well the powder. Accordingly, the dispersibility of the magnetic powder is further improved by adding the cellulosic resin, and the electromagnetic transducing characteristics are improved. |
