| 摘要 |
PURPOSE:To facilitate calendering and to improve surface characteristic by using a specific vinyl chloride copolymer, a rubber binder and polyisocyanate as resin components for a magnetic layer. CONSTITUTION:Magnetic powder is dispersed in the resin components consisting of a copolymer (0.2-0.7 OH/CH absorption ratio of IR absorption spectra) consisting of vinyl chloride (50-90wt%), vinyl alkyl carboxylate (5-40wt% vinyl acetate, vinyl propionate, etc.), a monomer copolymerizable with vinyl chloride (1.5-5.0wt% maleic acid, fumalic acid, methacrylic acid, their esters, etc.) and saponified matter of vinyl alkyl carboxylate and a rubber binder (polyester resin, urethane resin, etc.) as well as a polyisocyanate hardener, whereby a magnetic layer for magnetic recording is obtained. |
