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    • 8. 发明申请
    • Magnetic recording medium
    • 磁记录介质
    • US20080057351A1
    • 2008-03-06
    • US11730176
    • 2007-03-29
    • Katsuhiko MeguroMasatoshi TakahashiTakeshi Harasawa
    • Katsuhiko MeguroMasatoshi TakahashiTakeshi Harasawa
    • G11B5/738
    • G11B5/735G11B5/70678G11B5/714
    • A magnetic recording medium, which comprises: a backcoat layer; a nonmagnetic support; a nonmagnetic layer; and a magnetic layer, in this order, wherein the backcoat layer has Tg of from 65 to 95° C., and the binder constituting the backcoat layer satisfies the following requirements: (1) the binder comprises a vinyl chloride-based resin (PVC) and a polyurethane resin (PU); (2) PVC has a solubility parameter of from 9 to 11 (cal·cm3)1/2, Tg of from 65 to 95° C. and Mw of from 5000 to 25000; (3) a ratio of PVC to the total mass of PVC and PU is from 10 to 60% by mass; (4) PU has a solubility parameter of from 9.5 to 11.5 (cal·cm−3)1/2, Tg of from 80 to 110° C. and Mw of from 20000 to 60000; and (5) a ratio of PU to the total mass of PVC and PU is from 90 to 30% by mass.
    • 一种磁记录介质,包括:背涂层; 非磁性支撑; 非磁性层; 和磁性层,其中背涂层的Tg为65〜95℃,构成背涂层的粘合剂满足以下要求:(1)粘合剂包括氯乙烯系树脂(PVC )和聚氨酯树脂(PU); (2)PVC的溶解度参数为9〜11(cal.cm 3)1/2,Tg为65〜95℃,Mw为 5000至25000; (3)PVC与PVC和PU的总质量的比率为10〜60质量% (4)PU的溶解度参数为9.5〜11.5(cal.cm -3 -3)1/2,Tg为80〜110℃,Mw为 从20000到60000; 和(5)PU与PVC和PU的总质量的比例为90〜30质量%。