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1. 发明公开

EP1035145A2 Magnetic recording media and thermoplastic polyurethane resins therefor 审中-公开
标题翻译：磁记录介质和热塑性聚氨酯树脂
公开(公告)号：EP1035145A2
公开(公告)日：2000-09-13
申请号：EP00104828.9
申请日：2000-03-07
申请人： Toyo Boseki Kabushiki Kaisha
发明人： Kizumoto, Hirotoshi, c/o Toyo Boseki K.K. , Yatsuka, Takeshi, c/o Toyo Boseki K.K. , Sugitawa, Chikara, c/o Toyo Boseki K.K. , Doi, Kuniyuki, c/o Toyo Boseki Kabushiki Kaisha
IPC分类号： C08G18/42 , G11B5/702
CPC分类号： G11B5/7021 , C08G18/4202 , C08G18/4211 , C08G18/4238 , C09D175/06
摘要： 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 more, 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 aromatic dibasic acids and alicyclic dibasic acids at a ratio of 90 mol% or more of acid components; (b) a high molecular weight polyol having a molecular weight of 5000 or lower, which is at least one selected from (b1) polyester polyols each containing an aliphatic dibasic acid at a ratio of 90 mol% or more 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.
摘要翻译：一种磁记录介质，该磁记录介质具有通过涂布在非磁性载体上而形成的磁性层，所述磁性涂层包含分散在含有聚氨酯树脂的粘合剂中的磁性颗粒的磁性涂层，以及以重量计5％或更多的炭黑颗粒磁性颗粒的重量。在此使用的聚氨酯树脂由（a）分子量为2000以下且含有选自芳香族二元酸和脂环族二元酸中的至少一种的比例为90摩尔％以上的酸的聚酯多元醇组件; （b）分子量5000以下的高分子量多元醇，其是选自（b1）各自含有90mol％或更多酸组分的脂族二元酸的聚酯多元醇，（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或更低并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化合物。

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