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    • 38. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US6042938A
    • 2000-03-28
    • US992088
    • 1997-12-17
    • Tsunehiko IkarashiMasahide KohnoShinji Miyazaki
    • Tsunehiko IkarashiMasahide KohnoShinji Miyazaki
    • C09D175/04G11B5/72G11B5/735G11B5/68
    • G11B5/735Y10S428/90Y10T428/25
    • A magnetic recording medium includes a non-magnetic supporting substrate, and a magnetic layer on one surface thereof and a back coat layer on the other surface thereof, said back coat layer having a non-magnetic powder dispersed in a binder. The back coat layer contains carbon black and an inorganic powder as said non-magnetic powder. The carbon black contains a carbon black species having an average primary particle diameter of 40 to 70 nm, and the inorganic powder has an average primary particle diameter of 40 to 150 nm and a Mohs hardness of at least 3, with a weight ratio between said carbon black and said inorganic powder being 100:0.5 to 100:10. The binder comprises a phenoxy resin, a thermoplastic polyurethane resin having an amino group in a molecule thereof, and a polyisocyanate compound.
    • 磁记录介质包括非磁性支撑基板,在其一个表面上具有磁性层,在另一个表面上具有背涂层,所述背涂层具有分散在粘合剂中的非磁性粉末。 背涂层含有炭黑和作为非磁性粉末的无机粉末。 炭黑含有平均一次粒径为40〜70nm的碳黑物质,无机粉末的平均一次粒径为40〜150nm,莫氏硬度为3以上,重量比为 炭黑,所述无机粉末为100:0.5〜100:10。 粘合剂包含苯氧基树脂,分子中具有氨基的热塑性聚氨酯树脂和多异氰酸酯化合物。