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    Magnetic recording medium
    2.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4690870A

    公开(公告)日：1987-09-01

    申请号：US654290

    申请日：1984-09-25

    申请人： Tsutomu Okita ,  Nobuo Tsuji ,  Hiroshi Hashimoto ,  Yoshito Mukaida

    发明人： Tsutomu Okita ,  Nobuo Tsuji ,  Hiroshi Hashimoto ,  Yoshito Mukaida

    IPC分类号： C09D5/23 ,  C09D101/18 ,  C09D127/04 ,  C09D127/06 ,  C09D175/04 ,  C09D175/14 ,  G11B5/702

    CPC分类号： G11B5/7026 ,  G11B5/7022 ,  Y10S428/90 ,  Y10T428/31609 ,  Y10T428/31935 ,  Y10T428/31971

    摘要： A magnetic recording medium comprising a non-magnetic support having thereon an electron-beam radiation-cured magnetic recording layer, said magnetic layer comprising a ferromagnetic oxide and a binder comprising(1) a resin selected from the group consisting of a vinyl resin containing a carboxylic group in an amount of about 5.times.10.sup.-5 to 2.times.10.sup.-3 equivalent per gram and a nitrocellulose resin;(2) an urethane resin having at least one terminal acrylate group in the main chain or in a side chain of the molecule; and(3) a compound having at least one acryloyl group which is obtained by modifying the isocyanate group of a polyisocyanate having at least two isocyanate groups per molecule.

    摘要翻译： 一种磁记录介质，包括其上具有电子束辐射固化磁记录层的非磁性载体，所述磁性层包含铁磁性氧化物和粘合剂，所述粘合剂包括（1）选自乙烯基树脂中的树脂， 羧基的量为约5×10-5至2×10-3当量/克和硝酸纤维素树脂; （2）在分子的主链或侧链中具有至少一个末端丙烯酸酯基团的聚氨酯树脂; 和（3）具有至少一个丙烯酰基的化合物，其通过每分子具有至少两个异氰酸酯基团的多异氰酸酯的异氰酸酯基进行改性而获得。

    Magnetic recording material
    3.
    发明授权
    Magnetic recording material 失效
    磁记录材料

    公开(公告)号：US4576866A

    公开(公告)日：1986-03-18

    申请号：US592671

    申请日：1984-03-23

    申请人： Tsutomu Okita ,  Nobuo Tsuji ,  Yoshito Mukaida

    发明人： Tsutomu Okita ,  Nobuo Tsuji ,  Yoshito Mukaida

    IPC分类号： C08L75/16 ,  C09D5/23 ,  C09D101/18 ,  C09D127/04 ,  C09D127/06 ,  C09D175/04 ,  G11B5/702 ,  G11B5/70

    CPC分类号： G11B5/7026 ,  C08L75/16 ,  G11B5/7022 ,  Y10S428/90 ,  Y10T428/265 ,  Y10T428/31609 ,  Y10T428/31935

    摘要： There is provided a magnetic recording material which comprises a support and a magnetic layer coated thereon. The magnetic layer contains as its binder, a combination of at least one vinyl chloride-vinyl acetate-based copolymer characterized by its --CO.sub.2 H content or cellulose dinitrate, at least one urethane acrylate having a particular chemical structure, and at least one low molecular weight compound having two or more acryloyl or methacryloyl groups. The magnetic layer is hardened by beam irradiation. Thus, marked increase in dispersibility of ferromagnetic powders, improvement in electromagnetic transformation characteristics and sharp increase in durability are attained.

    摘要翻译： 提供了一种磁记录材料，其包括载体和涂覆在其上的磁性层。 磁性层包含作为其粘合剂的至少一种以其-CO 2 H含量或硝酸纤维素为特征的氯乙烯 - 乙酸乙烯酯基共聚物，至少一种具有特定化学结构的氨基甲酸酯丙烯酸酯和至少一种低分子量 具有两个以上丙烯酰基或甲基丙烯酰基的化合物。 磁性层通过光束照射而硬化。 因此，铁磁粉末的分散性显着增加，电磁转变特性的提高和耐久性急剧增加。

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

    公开(公告)号：US4672002A

    公开(公告)日：1987-06-09

    申请号：US598098

    申请日：1984-04-09

    申请人： Tsutomu Okita ,  Nobuo Tsuji ,  Yoshito Mukaida

    发明人： Tsutomu Okita ,  Nobuo Tsuji ,  Yoshito Mukaida

    IPC分类号： C09D5/23 ,  G11B5/702

    CPC分类号： G11B5/7026 ,  G11B5/7022 ,  Y10S428/90 ,  Y10T428/31609 ,  Y10T428/31935

    摘要： A magnetic recording medium comprising a support having coated thereon a magnetic layer is disclosed. The magnetic layer contains, as a binder, a composition cured with electron beam comprising (a) at least one of vinyl chloride-vinyl acetate type resins containing 5.times.10.sup.-5 to 1.7.times.10.sup.-3 equivalents of a carboxyl group per gram of the polymer and introcellulose resins, (b) a urethane resin and (c) at least one compound selected from the group consisting of aromatic or alicyclic compounds containing at least two vinyl linkages in the molecule and acryloyl-modified polyisocyanate compounds. The magnetic recording medium has excellent electromagnetic properties and durability.

    摘要翻译： 公开了一种包括其上涂覆有磁性层的载体的磁记录介质。 磁性层含有电子束固化的组合物，该组合物包含（a）每克聚合物含有5×10-5至1.7×10-3当量的羧基的氯乙烯 - 乙酸乙烯酯型树脂中的至少一种，和 内层纤维素树脂，（b）聚氨酯树脂和（c）至少一种选自分子中含有至少两个乙烯基键的芳族或脂环族化合物的化合物和丙烯酰基改性的多异氰酸酯化合物。 磁记录介质具有优异的电磁特性和耐久性。

    Magnetic recording medium
    5.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4699844A

    公开(公告)日：1987-10-13

    申请号：US598097

    申请日：1984-04-09

    申请人： Tsutomu Okita ,  Nobuo Tsuji ,  Yoshito Mukaida

    发明人： Tsutomu Okita ,  Nobuo Tsuji ,  Yoshito Mukaida

    IPC分类号： C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/14 ,  G11B5/702 ,  G11B5/78

    CPC分类号： G11B5/7026 ,  G11B5/7022 ,  Y10S428/90 ,  Y10T428/31609 ,  Y10T428/31935

    摘要： A magnetic recording medium comprised of a support base having a magnetic recording provided thereon is disclosed. The recording layer is comprised of ferromagnetic particles dispersed in a binder. The binder includes (1) a vinyl chloride-vinyl alkanoate type copolymer containing --CO.sub.2 H group of 5.times.10.sup.-5 to 1.7.times.10.sup.-3 equivalent per g of the polymer, (2) urethane acrylate having a molecular weight in the range of from 20,000 to 300,000, and (3) a compound having at least two (meth)acryloyl groups in the molecule and having a molecular weight of 600 or less. The magnetic recording layer is irradiated with electron beams in order to harden the binder. The resulting medium has excellent electromagnetic properties and the magnetic coating composition prepared for making the magnetic recording layer has excellent stability during storage.

    摘要翻译： 公开了一种磁记录介质，包括其上提供有磁记录的支撑基座。 记录层由分散在粘合剂中的铁磁颗粒组成。 粘合剂包括（1）含有每10克聚合物5×10-5至1.7×10-3当量的-CO 2 H基的氯乙烯 - 乙烯基链烷酸酯型共聚物，（2）分子量范围为20,000至 300,000，和（3）在分子中具有至少两个（甲基）丙烯酰基并且分子量为600以下的化合物。 用电子束照射磁记录层，以使粘合剂硬化。 所得到的介质具有优异的电磁特性，并且制备用于制备磁记录层的磁性涂料组合物在储存期间具有优异的稳定性。

    Magnetic recording medium
    7.
    发明授权
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：US4444838A

    公开(公告)日：1984-04-24

    申请号：US387129

    申请日：1982-06-10

    申请人： Yasuyuki Yamada ,  Goro Akashi ,  Nobuo Tsuji ,  Yoshito Mukaida

    发明人： Yasuyuki Yamada ,  Goro Akashi ,  Nobuo Tsuji ,  Yoshito Mukaida

    IPC分类号： C08G18/64 ,  C09D5/23 ,  G11B5/702 ,  G11B5/70

    CPC分类号： C08G18/6484 ,  G11B5/7022 ,  Y10S428/90 ,  Y10T428/264 ,  Y10T428/265 ,  Y10T428/31609 ,  Y10T428/31826 ,  Y10T428/31931

    摘要： A magnetic recording medium which comprises on a support base having coated thereon a magnetic layer containing a binder and a ferromagnetic fine powder dispersed in the binder is disclosed. The binder is comprised of a cellulose derivative having a residual OH group in a proportion of 7.5 to 40%, a diolefin or olefin series synthetic rubber and a polyisocyanate compound. The medium has excellent video sensitivity and video signal to noise ratio. The medium of the invention also have improved abrasion resistance.

    摘要翻译： 公开了一种磁记录介质，其包括在其上涂覆有包含粘合剂的磁性层的支撑基底和分散在粘合剂中的铁磁细粉末。 粘合剂由具有7.5〜40％的残留OH基的纤维素衍生物，二烯烃或烯烃系合成橡胶和多异氰酸酯化合物构成。 该介质具有出色的视频灵敏度和视频信噪比。 本发明的介质也具有改善的耐磨性。

    Process for producing a magnetic recording medium
    8.
    发明授权
    Process for producing a magnetic recording medium 失效
    磁记录介质的制造方法

    公开(公告)号：US4391851A

    公开(公告)日：1983-07-05

    申请号：US353791

    申请日：1982-03-02

    申请人： Yasuyuki Yamada ,  Goro Akashi ,  Nobuo Tsuji ,  Yoshito Mukaida ,  Masaaki Fujiyama

    发明人： Yasuyuki Yamada ,  Goro Akashi ,  Nobuo Tsuji ,  Yoshito Mukaida ,  Masaaki Fujiyama

    IPC分类号： G11B5/842 ,  G11B5/702 ,  G11B5/84 ,  H01F10/02

    CPC分类号： G11B5/84 ,  G11B5/7021

    摘要： A process for producing a magnetic recording medium is disclosed. The process involves coating a non-magnetic base with magnetic coating solution containing fine ferromagnetic particles and a binder comprising nitrocellulose, polyol and an isocyanate having at least two isocyanato groups. In the process, the web having 0.3 to 3 wt % of the residual solvent in the magnetic layer is calendered, and the calendered web is then dried thoroughly.

    摘要翻译： 公开了一种制造磁记录介质的方法。 该方法包括用含有细铁磁颗粒的磁性涂层溶液和包含硝化纤维素，多元醇和具有至少两个异氰酸酯基的异氰酸酯的粘合剂涂覆非磁性碱。 在该方法中，将磁性层中的残留溶剂的0.3〜3重量％的纤维网压延，然后将压延纤维网彻底干燥。

    Magnetic recording material
    9.
    发明授权
    Magnetic recording material 失效
    磁记录材料

    公开(公告)号：US4657817A

    公开(公告)日：1987-04-14

    申请号：US558673

    申请日：1983-12-06

    申请人： Tsutomu Okita ,  Kyoichi Naruo ,  Nobuo Tsuji ,  Teruo Nakagawa ,  Kiyoshi Murase ,  Takahisa Ogasawara

    发明人： Tsutomu Okita ,  Kyoichi Naruo ,  Nobuo Tsuji ,  Teruo Nakagawa ,  Kiyoshi Murase ,  Takahisa Ogasawara

    IPC分类号： C08F290/00 ,  C08F299/06 ,  C08G18/42 ,  C08G18/67 ,  C08L75/16 ,  C09D5/23 ,  C09D175/04 ,  C09D175/14 ,  G11B5/702 ,  G11B5/70

    CPC分类号： G11B5/7026 ,  C08G18/42 ,  C08G18/672 ,  C08L75/16 ,  G11B5/7021 ,  Y10S428/90 ,  Y10T428/31609

    摘要： There is provided a magnetic recording material produced by coating on a support a magnetic coating composition which contains as main components a magnetic powder and a binder, the binder comprising an urethane acrylate synthesized using a polyester polyol having a particular structure, and by irradiating the resulting magnetic coat with electron beams to harden it. The polyester polyol contains polyhydric alcohol component, 50 mole % or more of which is a dihydric alcohol selected from the class (A) described below, and/or polybasic acid component, 50 mole % or more of which is a dibasic acid selected from the class (B) described below. The urethane acrylate is synthesized under such a condition that it may have two or more of (meth)acryloyl groups per molecule. Thus, improvements in electromagnetic properties and in durability are attained.Class (A): Alkyl-substituted aliphatic dihydric alcohols, alicyclic dihydric alcohols, and dihydric alcohols made by addition of alkylene oxides to alicyclic or aromatic dihydric alcohols.Class (B): Alicyclic dicarboxylic acids and aromatic dicarboxylic acids.

    摘要翻译： 提供了一种通过在载体上涂覆磁性涂料组合物而制备的磁记录材料，磁性涂料组合物含有作为主要组分的磁性粉末和粘合剂，所述粘合剂包含使用具有特定结构的聚酯多元醇合成的聚氨酯丙烯酸酯，并且通过照射所得到的 磁性涂层用电子束硬化。 聚酯多元醇含有多元醇成分，其中50摩尔％以上是选自下述（A）的二元醇，和/或多元酸成分，50摩尔％以上的二元酸选自 （B）类。 氨基甲酸酯丙烯酸酯在每分子可以具有两个以上（甲基）丙烯酰基的条件下合成。 因此，获得了电磁特性和耐久性的改善。 （A）类：烷基取代的脂族二元醇，脂环族二元醇和通过将环氧烷烃加成到脂环族或芳族二元醇中制得的二元醇。 类（B）：脂环族二羧酸和芳族二羧酸。