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    • 75. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US4115290A
    • 1978-09-19
    • US790914
    • 1977-04-26
    • Yuichi KubotaNorifumi Kajimoto
    • Yuichi KubotaNorifumi Kajimoto
    • C08L1/18G11B5/702H01F1/00B23B15/00
    • C08L1/18G11B5/7022
    • A magnetic recording medium is prepared by preparing a nitrocellulose-based magnetic composition by kneading a magnetic powder with a mixture of nitrocellulose in a solvent system containing isopropyl alcohol and blending the kneaded mixture with a polyurethane containing unreacted isocyanate groups; coating a substrate with the resulting magnetic composition and allowing the coated substrate to dry. The improvement comprises replacing substantial portions of the isopropyl alcohol from the group consisting of polyurethane resins, polybutadiene resins, butadiene-acrylonitrile copolymers, vinyl chloride-vinyl acetate-vinyl alcohol copolymers, vinyl chloride-vinyl acetate copolymers, vinyl chloride-vinylidene chloride copolymers, vinylidene chloride-acrylonitrile copolymers, vinyl acetate resins, epoxy resins, phenoxy resins, polyvinyl butyral resins, polyvinyl formal resins and polyester resins.
    • 通过将磁性粉末与含有异丙醇的溶剂体系中的硝化纤维素的混合物捏合并将捏合的混合物与含有未反应的异氰酸酯基团的聚氨酯混合制备硝酸纤维素系磁性组合物来制备磁记录介质; 用得到的磁性组合物涂覆基材并使涂覆的基材干燥。 该改进包括从由聚氨酯树脂,聚丁二烯树脂,丁二烯 - 丙烯腈共聚物,氯乙烯 - 乙酸乙烯酯 - 乙烯醇共聚物,氯乙烯 - 乙酸乙烯酯共聚物,氯乙烯 - 偏二氯乙烯共聚物,氯乙烯 - 偏二氯乙烯共聚物组成的组中替代大部分异丙醇, 偏二氯乙烯 - 丙烯腈共聚物,乙酸乙烯酯树脂,环氧树脂,苯氧基树脂,聚乙烯醇缩丁醛树脂,聚乙烯醇缩甲醛树脂和聚酯树脂。