| 摘要 |
PURPOSE:To improve the electromagnetic transducing characteristics by forming a magnetic layer contg. a liq. acrylic oligomer, a radiation curing resin, vinyl chloride resin and magnetic powder so as to improve the dispersibility and fillability of the magnetic powder as well as the durability of the layer. CONSTITUTION:The acrylic oligomer is prepd. by mixing dipentaerythritol hexaacrylate with the ester of dipentaerythritol with pentaacrylic acid or lower, and the oligomer is used by 1-80wt% of the total amount of the binder components. A urethane-acrylic oligomer, a spiroacetal-acrylic oligomer or the like having <5,000mol.wt. and 2-4 functional groups is suitable for use as the radiation curing resin, and it is used by 1-40wt% of the total amount of the binder components. The vinyl chloride resin is used by 1-80wt% of the total amount of the binder components. |
