| 摘要 |
<p>In a magnetic recording medium consisting of a base coated with a magnetic coating material, or a dispersion of magnetic particles in a resinous binder, the binder comprises a copolymer composed of vinyl chloride, a vinyl alkylcarboxylate, another monomer copolymerizable with vinyl chloride, and a saponified vinyl alkylcarboxylate and having an OH/CH absorption ratio according to the infrared absorption spectrum of 0.2 to 0.7, a polyurethane resin having in its molecule a -SO3M group wherein M represents an alkali metal atom, and a polyurethane resin or polyester resin or both containing no -SO3M group wherein M represents an alkali metal atom, and a polyisocyanate.</p> |
