| 摘要 |
<p>PURPOSE:To obtain a recording medium which is excellent in humidity and heat resisting property, stable running property, and dispersion property of magnetic powder, by using a bonding agent of a specific mixing range consisting of 3 kinds of resin of polyurethane having a terminal OH group, epoxy resin and specific vinyl chloride copolymer. CONSTITUTION:A bonding agent is used consisting of 3 components of 30-70% polyurethane having a terminal OH group, 10-50% condensation polymer of epichlohydrin and diphenylol propane, and 10-50% either one of the copolymers of vinyl chloride-vinyl acetate, vinyl chloride-vinyl acetate-maleic acid, or vinyl chloride-vinyl acetate-vinyl alcohol as shown by weight of the total quantity of a bonding agent in magnetic paints. By using said bonding agent, it is possible to obtain a magnetic recording medium in which magnetic powder is homogeneously dispersed, excellent in not only tightness of a magnetic layer but also an electromagnetic characteristic, and satisfactory in durability.</p> |
