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    • 4. 发明授权
    • Magnetic recording media and thermoplastic polyurethane resins therefor
    • 磁记录介质及其热塑性聚氨酯树脂
    • US06545119B2
    • 2003-04-08
    • US09520204
    • 2000-03-07
    • Hirotoshi KizumotoTakeshi YatsukaChikara SugitawaKuniyuki Doi
    • Hirotoshi KizumotoTakeshi YatsukaChikara SugitawaKuniyuki Doi
    • C08G1842
    • G11B5/7021C08G18/4202C08G18/4211C08G18/4238C09D175/06
    • A magnetic recording medium possessing a magnetic layer formed by application onto a non-magnetic support, of a magnetic coating containing magnetic particles dispersed in a binder which contains a polyurethane resin, together with carbon black particles at 5% by weight or higher, based on the weight of the magnetic particles. The polyurethane resin to be used herein is composed of: (a) a polyester polyol having a molecular weight of 2000 or lower and containing at least one selected from the group consisting of aromatic dibasic acids and alicyclic dibasic acids at a ratio of 90 mol % or higher of acid components; (b) a high molecular weight polyol having a molecular weight of 5000 or lower, which is at least one selected from the group consisting of (b1) polyester polyols each containing an aliphatic dibasic acid at a ratio of 90 mol % or higher of acid components, (b2) polylactones, (b3) polyester polyols, and (b4) polycarbonate polyols; (c) an organic diisocyanate compound; and (d) an optional compound having a molecular weight of 500 or lower and containing at least two functional groups in one molecule, which are reactive with isocyanate groups.
    • 一种具有磁性层的磁记录介质,其特征在于,在非磁性载体上形成磁性涂层,所述磁性涂层含有分散在含有聚氨酯树脂的粘合剂中的磁性颗粒以及基于5重量%以上的碳黑颗粒,基于 磁性颗粒的重量。 本说明书中使用的聚氨酯树脂由以下组成:(a)分子量为2000以下且含有选自芳族二元酸和脂环族二元酸中的至少一种的聚酯多元醇的比例为90摩尔% 或更高的酸组分; (b)分子量为5000以下的高分子量多元醇,其为选自(b1)各自含有比例为90摩尔%以上的脂肪族二元酸的(b1)的聚酯多元醇中的至少一种 组分,(b2)聚内酯,(b3)聚酯多元醇和(b4)聚碳酸酯多元醇; (c)有机二异氰酸酯化合物; 和(d)分子量为500以下且在一个分子中含有至少两个与异氰酸酯基团反应的官能团的任选的化合物。