| 摘要 |
PURPOSE:To obtain the titled medium having an unidispersibility of magnetic powders and a good adhesion against the substrate by forming on a substrate, a magnetic layer dispersed ferromagnetic powders to a copolymer contg. vinyl chloride, vinyl alcohol and an amine modified vinyl compd. as main components. CONSTITUTION:The binding agent contains 60-95wt% vinyl chloride, 2-16wt% vinyl alcohol and 0.05-5wt% amino modified vinyl monomer as main components. If necessary, some amounts of the another copolymer obtd. by copolymerizing the another monomers such as an (metha) acrylic acid alkyl ester, a maleic acid ester and vinylidene chloride may be used. The magnetic layer dispersed the ferromagnetic powders such as the magnetic powders of oxides, a metal and an alloy powders to said binder, is formed on the substrate. A polyisocyanate type curing agent is preferably compounded to said copolymer. By providing the magnetic layer on the substrate, the titled medium having a good adhesive force against the substrate, a good dispersibility of the magnetic powders, an excellent durability having a good S/N, is obtd.
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