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    Magnetic recording medium and method of manufacturing the same
    1.
    发明授权
    Magnetic recording medium and method of manufacturing the same 有权
    磁记录介质及其制造方法

    公开(公告)号：US08795858B2

    公开(公告)日：2014-08-05

    申请号：US13051765

    申请日：2011-03-18

    申请人： Masahide Sato ,  Katsumi Araki ,  Kazufumi Omura ,  Tomohiro Ichikawa ,  Shinji Tsujimoto ,  Tadahiro Ooishi

    发明人： Masahide Sato ,  Katsumi Araki ,  Kazufumi Omura ,  Tomohiro Ichikawa ,  Shinji Tsujimoto ,  Tadahiro Ooishi

    IPC分类号： G11B5/716

    CPC分类号： G11B5/7022 ,  G11B5/7013 ,  G11B5/7026 ,  G11B5/714 ,  G11B5/842

    摘要： An aspect of the present invention relates to a magnetic recording medium comprising a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support, wherein the binder of the magnetic layer is a mixture of a vinyl chloride copolymer, polyurethane resin, and polyisocyanate, the polyurethane resin having a glass transition temperature ranging from 90 to 130° C. and a storage elastic modulus at 80° C. ranging from 2.5 to 5.0 GPa, the nonmagnetic layer is a radiation-cured layer formed by curing with radiation a radiation-curable composition comprising a nonmagnetic powder and a binder component, the binder component comprising a radiation-curable vinyl chloride copolymer and a radiation-curable polyurethane resin, and the radiation-curable vinyl chloride copolymer and radiation-curable polyurethane resin both have glass transition temperatures ranging from 30 to 100° C.

    摘要翻译： 本发明的一个方面涉及一种在非磁性载体上依次包含含有非磁性粉末和粘合剂的非磁性层和含有铁磁性粉末和粘合剂的磁性层的磁记录介质，其中磁性层的粘结剂为 氯乙烯共聚物，聚氨酯树脂和多异氰酸酯的混合物，所述聚氨酯树脂的玻璃化转变温度为90〜130℃，80℃下的储能弹性模量为2.5〜5.0GPa，非磁性层 是通过用辐射固化形成的辐射固化层，所述辐射固化组合物包含非磁性粉末和粘合剂组分，所述粘合剂组分包含可辐射固化的氯乙烯共聚物和可辐射固化的聚氨酯树脂，以及所述可辐射固化的乙烯基 氯化物共聚物和可辐射固化的聚氨酯树脂都具有30至100℃的玻璃化转变温度。

    MAGNETIC RECORDING MEDIUM, BINDER FOR MAGNETIC RECORDING MEDIUM, AND POLYURETHANE RESIN
    2.
    发明申请
    MAGNETIC RECORDING MEDIUM, BINDER FOR MAGNETIC RECORDING MEDIUM, AND POLYURETHANE RESIN 审中-公开
    磁记录介质，磁记录介质粘合剂和聚氨酯树脂

    公开(公告)号：US20100055505A1

    公开(公告)日：2010-03-04

    申请号：US12548989

    申请日：2009-08-27

    申请人： Kazufumi Omura ,  Hirotaka Sato ,  Tadahiro Ooishi

    发明人： Kazufumi Omura ,  Hirotaka Sato ,  Tadahiro Ooishi

    IPC分类号： G11B5/733 ,  G11B5/702 ,  C08G18/00

    CPC分类号： G11B5/7021 ,  C08G18/0828 ,  C08G18/4269 ,  C08L27/06 ,  C08L75/04 ,  C08L2666/06

    摘要： An aspect of the present invention relates to a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic power and a binder on a nonmagnetic support, wherein, the binder comprises a constituent component in the form of a polyurethane resin obtained from starting materials in the form of a polyisocyanate and a polyol denoted by general formula (I): wherein, in general formula (I), Z1 denotes an atom group forming a lactone ring with two adjacent carbon atoms.

    摘要翻译： 本发明的一个方面涉及一种磁记录介质，其包括在非磁性载体上包含铁磁性磁性层和粘合剂的磁性层，其中，所述粘合剂包含由以下形式的原料获得的聚氨酯树脂形式的构成组分 的多异氰酸酯和由通式（I）表示的多元醇：其中，在通式（I）中，Z1表示形成具有两个相邻碳原子的内酯环的原子团。

    METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM MANUFACTURED BY THE SAME
    4.
    发明申请
    METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM MANUFACTURED BY THE SAME 审中-公开
    制造磁记录介质的方法和由其制造的磁记录介质

    公开(公告)号：US20090098414A1

    公开(公告)日：2009-04-16

    申请号：US12240406

    申请日：2008-09-29

    申请人： Tadahiro OOISHI ,  Kazufumi Omura ,  Hitoshi Noguchi ,  Hiroaki Takano

    发明人： Tadahiro OOISHI ,  Kazufumi Omura ,  Hitoshi Noguchi ,  Hiroaki Takano

    IPC分类号： G11B5/706 ,  B05D5/00

    CPC分类号： G11B5/7021 ,  G11B5/7013 ,  G11B5/714 ,  G11B5/842

    摘要： The present invention relates to a method of manufacturing a magnetic recording medium wherein the magnetic layer coating liquid comprising a ferromagnetic powder having an average particle size of 10 to 40 nm and a moisture content of 0.3 to 3.0 weight percent; a binder (a) comprising 0.2 to 0.7 meq/g of at least one polar group selected from the group consisting of —SO3M, —OSO3M, —PO(OM)2, —OPO(OM)2, and COOM (M denotes a hydrogen atom or the like) and having a weight average molecular weight of 20,000 to 200,000, and/or (b) comprising 0.5 to 5 meq/g of at least one polar group selected from the group consisting of —CONR1R2, —NR1R2, and —NR+R1R2R3 (wherein R1, R2, and R3 each independently denote a hydrogen atom or the like) and having a weight average molecular weight of 20,000 to 200,000; and a compound comprising at least one carboxyl group and/or hydroxyl group per molecule.

    摘要翻译： 磁记录介质的制造方法技术领域本发明涉及一种制造磁记录介质的方法，其中所述磁性层涂布液含有平均粒度为10〜40nm，水分含量为0.3〜3.0重量％的铁磁性粉末; 包含0.2至0.7meq / g的至少一种选自-SO 3 M，-OSO 3 M，-PO（OM）2，-OPO（OM）2和COOM的极性基团的粘合剂（a）（M表示 氢原子等），重均分子量为20,000〜200,000，和/或（b）含有0.5〜5meq / g的至少一种极性基团，选自-CONR1R2，-NR1R2和 -NR + R1R2R3（其中R1，R2和R3各自独立地表示氢原子等），重均分子量为20,000〜200,000; 和每分子含有至少一个羧基和/或羟基的化合物。

    Sulfonic acid polyol compound, polyurethane resin, polyurethane resin for magnetic recording medium, and magnetic recording medium
    6.
    发明授权
    Sulfonic acid polyol compound, polyurethane resin, polyurethane resin for magnetic recording medium, and magnetic recording medium 有权
    磺酸多元醇化合物，聚氨酯树脂，用于磁记录介质的聚氨酯树脂和磁记录介质

    公开(公告)号：US07737304B2

    公开(公告)日：2010-06-15

    申请号：US12235709

    申请日：2008-09-23

    申请人： Kazufumi Omura ,  Masahiko Mori ,  Katsumi Araki ,  Masataka Yoshizawa

    发明人： Kazufumi Omura ,  Masahiko Mori ,  Katsumi Araki ,  Masataka Yoshizawa

    IPC分类号： C07C321/00 ,  C07C323/00 ,  C07C381/00 ,  C08G18/00 ,  G11B5/708 ,  G11B5/33

    CPC分类号： G11B5/7021 ,  C07C309/14 ,  C08G18/0828 ,  C08G18/3215 ,  C08G18/3857 ,  C08G18/4676 ,  G11B5/714

    摘要： A compound represented by the Formula (1) below is provided: wherein X denotes a divalent linking group, R1 and R2 independently denote an alkyl group having 3 or more carbons and having at least one hydroxy group or an aralkyl group having 8 or more carbons and having at least one hydroxy group, the alkyl group and aralkyl group may have a substituent, and M denotes a hydrogen atom or a cation. There is also provided a polyurethane resin obtained by polymerization of a polyisocyanate and a polyol that includes the compound. There is also provided a magnetic recording medium that includes a non-magnetic support and, above the support, at least one magnetic layer including a ferromagnetic powder dispersed in a binder that includes the polyurethane resin. There is also provided a magnetic recording medium that includes a non-magnetic support, above the support at least one non-magnetic layer including a non-magnetic powder dispersed in a binder (1), and, above the non-magnetic layer, at least one magnetic layer having a ferromagnetic powder dispersed in a binder (2), in which binder (1) and/or binder (2) is the polyurethane resin.

    摘要翻译： 提供由下式（1）表示的化合物：其中X表示二价连接基团，R 1和R 2独立地表示具有3个或更多个碳原子并且具有至少一个羟基或具有8个或更多个碳的芳烷基的烷基 并且具有至少一个羟基，烷基和芳烷基可以具有取代基，M表示氢原子或阳离子。 还提供了通过聚合多异氰酸酯和包含该化合物的多元醇获得的聚氨酯树脂。 还提供了一种磁记录介质，其包括非磁性载体，并且在载体上方，至少包括分散在包含聚氨酯树脂的粘合剂中的铁磁粉末的磁性层。 还提供了一种磁记录介质，其包括非磁性载体，在载体上方至少一个包含分散在粘合剂（1）中的非磁性粉末的非磁性层，以及非磁性层上方，在 至少一个具有分散在粘合剂（2）中的铁磁粉末的磁性层，其中粘合剂（1）和/或粘合剂（2）是聚氨酯树脂。