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    • 8. 发明专利
    • MAGNETIC RECORDING MEDIUM AND PRODUCTION THEREOF
    • JPH043314A
    • 1992-01-08
    • JP10616190
    • 1990-04-20
    • MATSUSHITA ELECTRIC IND CO LTD
    • UEDA HIDEYUKISAKAI MASAYUKITAKAI YORIKO
    • G11B5/702C09D5/23C09D127/04C09D127/06C09D175/00C09D175/04
    • PURPOSE:To obtain the magnetic recording medium having excellent durability by mixing three kinds of binders varying in the reactivity (gel molar fraction) from a crosslinking agent (polyisocyanate compd.) and specifying the reactivity of the binder compsn. and the crosslinking agent to >=80%. CONSTITUTION:The three-dimensional network structure which is insoluble and inmeltable in a solvent is formed by the addition reaction between functional groups (isocyanate group and hydroxyl group) and consequently, the tough coated films are formed and the durability of the magnetic layer is improved. The generation of flaws on the surface of the magnetic layer and the generation of drop-outs by the powder dislodged from the magnetic layer are obviated. Further, three kinds of the binders are added in order of the lower reactivity with the crosslinking agent at the time of preparing a magnetic coating material, by which the adsorption layer effective for the dispersion of the magnetic particles is first adsorbed by the binder having the low reactivity with the crosslinking agent without strongly adsorbing and fixing the binder having the good reactivity with the crosslinking agent. The durability of the magnetic layer is, therefore, greatly improved while the electromagnetic conversion characteristics are assured.