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1. 发明授权

US5089331A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5089331A
公开(公告)日：1992-02-18
申请号：US421434
申请日：1989-10-13
申请人： Katsumi Ryoke , Masatoshi Takahashi , Tsugio Izaki , Masaki Suzuki
发明人： Katsumi Ryoke , Masatoshi Takahashi , Tsugio Izaki , Masaki Suzuki
IPC分类号： G11B5/708 , G11B5/735
CPC分类号： G11B5/735 , G11B5/708 , Y10S428/90 , Y10T428/25 , Y10T428/257 , Y10T428/30
摘要： A magnetic recording medium composed of a non-magnetic support having thereon at least one magnetic layer containing a ferromagnetic fine powder dispersed in a binder, wherein (a) the magnetic layer further contains at least one of (i) carbon black having a sodium content of at most 100 ppm, (ii) carbon black having a chlorine content of less than 400 ppm, and (iii) an abrasive having a Mohn' hardness of at least 8 and a mean particle size of 0.05 to 0.5 .mu.m and a sodium content of at most 100 ppm; (b) the ferromagnetic fine powder is a magnetic metal powder having a sodium content of at most 200 ppm; and/or (c) the magnetic recording medium further has a back layer provided on the side of the non-magnetic support opposite to the magnetic layer, containing carbon black having a chlorine content of at most 300 ppm dispersed in a binder. The magnetic recording medium has superior storage stability, with remarkably limited dropout increase, head clogging, C S/N decrease and RF output decrease.
摘要翻译：一种由非磁性载体组成的磁记录介质，其上具有至少一个含有分散在粘合剂中的铁磁细粉末的磁性层，其中（a）磁性层还包含以下中的至少一种：（i）具有钠含量至多100ppm，（ii）氯含量小于400ppm的炭黑，和（iii）具有至少8的莫氏硬度和0.05至0.5μm的平均粒度的磨料和钠含量至多100ppm; （b）铁磁细粉是钠含量在200ppm以下的磁性金属粉末; 和/或（c）磁记录介质还具有设置在与磁性层相对的非磁性载体一侧的背层，该背层含有分散在粘合剂中的氯含量至多为300ppm的碳黑。磁记录介质具有优良的存储稳定性，显着的压差增加，头堵塞，C / N降低和RF输出减少。

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