| 摘要 |
<p>PURPOSE:To increase the wear resistance of medium, by using the bonding agent including nitrocellulose immersed with polyvinyl chloride, polyurethane resin and polyvinyl chloride-acetate copolymer containing polyvinyl alcohol, in the manufacture of magnetic recording medium. CONSTITUTION:Based on the magnetic powder 100pts.wt. such as gamma-Fe2O3 magnetic powder, the bonding agent including (a) about 3-10pts.wt. of nitrocellulose immersed with polyvinyl, (b) about 5-20pts.wt. of polyurethane resin,and (c) about 3-10pts.wt. of polyvinyl chloride-acetate copolymer containing polyvinyl >=10wt% of polyvinyl alcohol is prepared and the magnetic powder is dispersed in this bonding agent. Next, this dispersed liquid is coated on the support.</p> |
