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    Magnetic recording medium
    3.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4756962A

    公开(公告)日：1988-07-12

    申请号：US41177

    申请日：1987-04-22

    Applicant: Shigeru Takamatsu ,  Hideo Dobashi ,  Hitoshi Azegami

    Inventor： Shigeru Takamatsu ,  Hideo Dobashi ,  Hitoshi Azegami

    IPC: C09D5/23 ,  C09D7/12 ,  G11B5/708

    CPC classification number: G11B5/708 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257

    Abstract: A magnetic recording medium, comprising a plastic base coated with a magnetic layer of a ferromagnetic powder dispersed in a resin binder, contains in the magnetic layer .alpha.-Al.sub.2 O.sub.3 particles with an average particle size of 0.1 to 0.3 .mu.m as determined by electron microscopy in an amount of more than 0.5% but less than 15% by weight on the basis of the ferromagnetic powder weight. The .alpha.-Al.sub.2 O.sub.3 particles have an .alpha.-transformation rate of at least 50%. The powder is produced by an organic alumina process.

    Abstract translation: 包含涂布有分散在树脂粘合剂中的铁磁性粉末的磁性层的塑料基体的磁记录介质在通过电子显微镜测定的平均粒径为0.1至0.3μm的磁性层中含有α-Al 2 O 3颗粒， 其量以铁磁粉末重量为基准，大于0.5重量％但小于15重量％。 α-Al2O3颗粒的α-转化率至少为50％。 该粉末由有机氧化铝工艺生产。

    Magnetic recording medium
    4.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4391877A

    公开(公告)日：1983-07-05

    申请号：US359421

    申请日：1982-03-18

    Applicant: Fujio Shibata ,  Hiroshi Kawahara ,  Hitoshi Azegami

    Inventor： Fujio Shibata ,  Hiroshi Kawahara ,  Hitoshi Azegami

    IPC: G11B5/708 ,  C09D5/23 ,  C09D7/12 ,  G11B5/71 ,  H01F10/02

    CPC classification number: G11B5/71 ,  Y10S428/90 ,  Y10T428/31678

    Abstract: A magnetic recording medium including a substrate having a magnetic coating layer thereon, said magnetic coating layer comprising ferromagnetic particles dispersed in a binder vehicle, characterized in that the magnetic coating layer contains one or more ketones selected from the compounds expressed by the general formula ##STR1## wherein R.sub.1 and R.sub.2 represent saturated or unsaturated chain aliphatic radicals, both or either of which have 11 to 22 carbon atoms and may contain hydroxyl, carboxyl or amino groups.

    Abstract translation: 一种包括其上具有磁性涂层的基板的磁记录介质，所述磁性涂层包含分散在粘合剂载体中的铁磁颗粒，其特征在于，所述磁性涂层含有一种或多种选自以下通式的化合物： >其中R 1和R 2表示饱和或不饱和的链脂肪族基团，其中两个或任一个具有11-22个碳原子并且可以含有羟基，羧基或氨基。

    Lubricant sheet for magnetic tape cassette
    8.
    发明授权
    Lubricant sheet for magnetic tape cassette 失效
    磁带盒用润滑片

    公开(公告)号：US4376519A

    公开(公告)日：1983-03-15

    申请号：US271867

    申请日：1981-06-09

    Applicant: Toshihiko Ishida ,  Hitoshi Azegami ,  Yoshio Kawakami

    Inventor： Toshihiko Ishida ,  Hitoshi Azegami ,  Yoshio Kawakami

    IPC: C09K8/514 ,  G11B23/087 ,  G03B1/04 ,  G11B15/32

    CPC classification number: G11B23/08764 ,  C09K8/514 ,  Y10S242/90 ,  Y10S242/914

    Abstract: A lubricant sheet for a magnetic tape cassette characterized in that at least one side of a base incorporating an antistatic agent is provided with a release type silicone coating. This lubricant sheet combines the transparency derived from the use of the clear base and coating materials with the low friction characteristic and the antistatic property to suit the application as such for transparent tape cassette cases.

    Abstract translation: 一种用于磁带盒的润滑片，其特征在于，包含抗静电剂的基体的至少一侧设置有剥离型硅氧烷涂层。 该润滑剂片材将透明基材和涂料的使用透明度与低摩擦特性和抗静电性相结合，以适用于透明带盒的应用。

    Magnetic recording medium
    10.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US5089344A

    公开(公告)日：1992-02-18

    申请号：US386980

    申请日：1989-07-31

    Applicant: Kazunori Tamazaki ,  Hitoshi Azegami ,  Kazuhiro Kuroda

    Inventor： Kazunori Tamazaki ,  Hitoshi Azegami ,  Kazuhiro Kuroda

    IPC: C08G18/66 ,  C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702 ,  G11B5/842

    CPC classification number: C08G18/664 ,  G11B5/7021 ,  G11B5/842 ,  Y10S428/90 ,  Y10T428/31609

    Abstract: A magnetic recording medium whose magnetic layer formed on a base comprises a magnetic powder and a binder which contains a tertiary amine and uses 1,4-cyclohexanedimethanol as a chain extender. The magnetic powder is preferably of CrO.sub.2. The medium is made by mixing and dispersing the magnetic powder in a binder which consists of a reaction product of (A) a polyester which is a reaction product of a diol selected from among ethylene glycol, propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentadiol, and 1,6-hexanediol, and adipic acid, (B) a chain extender consisting of 1,4-cyclohexanedimethanol, (C) an aliphatic or aromatic diisocyanate in an amount substantially equal to the combined molar amount of the polyester and the chain extender, and (D) a tertiary amine, and applying the resulting magnetic coating material to a base.

    Abstract translation: 形成在基材上的磁性层的磁记录介质包括磁性粉末和含有叔胺的粘合剂，并使用1,4-环己烷二甲醇作为扩链剂。 磁性粉末优选为CrO 2。 该介质通过将磁性粉末混合并分散在粘合剂中而制成，所述粘合剂由（A）作为选自乙二醇，丙二醇，1,3-丁二醇，1,3-丁二醇的二醇的反应产物的聚酯的反应产物组成 ，1,4-丁二醇，1,5-戊二醇和1,6-己二醇，和己二酸，（B）由1,4-环己烷二甲醇组成的扩链剂，（C）基本上等于 聚酯和扩链剂的组合摩尔量，和（D）叔胺，并将所得的磁性涂层材料施加到基底上。

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