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    Magnetic recording disc comprising a non-magnetic underlayer and a magnetic layer comprising ferromagnetic particles and a binder
    1.
    发明授权
    Magnetic recording disc comprising a non-magnetic underlayer and a magnetic layer comprising ferromagnetic particles and a binder 失效
    磁记录盘包括非磁性底层和包含铁磁颗粒和粘合剂的磁性层

    公开(公告)号：US5384175A

    公开(公告)日：1995-01-24

    申请号：US959795

    申请日：1992-10-13

    申请人： Masaya Kojima ,  Kazuhiro Niitsuma ,  Satoru Hayakawa ,  Toshio Kawamata ,  Yasushi Endo

    发明人： Masaya Kojima ,  Kazuhiro Niitsuma ,  Satoru Hayakawa ,  Toshio Kawamata ,  Yasushi Endo

    IPC分类号： G11B5/706 ,  G11B5/738 ,  G11B23/00

    CPC分类号： G11B5/70605 ,  G11B5/738 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/265 ,  Y10T428/30

    摘要： A novel magnetic recording disc is provided comprising, a nonmagnetic support having thereon a nonmagnetic layer comprising nonmagnetic particles and a binder resin, and a magnetic layer comprising ferromagnetic particles and a binder resin, in this order. The nonmagnetic particles in the nonmagnetic layer are partially or entirely electrically conductive particles, the thickness of the magnetic layer is in the range of 0.5 .mu.m or less, and the orientation ratio of the ferromagnetic particles in the magnetic layer is 0.85 or more.A novel process for preparing the magnetic recording disc is provided. Further, a novel process for recording and reproduction of a signal having a shortest recordable wavelength of 1.5 .mu.m or less is provided, which utilizes the magnetic recording disc in conjunction with a magnetic head having a gap length (.delta.) of 0.50 .mu.m or less.

    摘要翻译： 提供了一种新颖的磁记录盘，其包括：非磁性载体，其上具有包含非磁性颗粒和粘合剂树脂的非磁性层，以及包含铁磁颗粒和粘合剂树脂的磁性层。 非磁性层中的非磁性颗粒是部分或全部是导电颗粒，磁性层的厚度在0.5μm或更小的范围内，并且磁性层中铁磁性颗粒的取向比为0.85以上。 提供了一种制备磁记录盘的新颖方法。 另外，提供了一种用于记录和再现具有最小可记录波长为1.5μm或更小的信号的新颖方法，其利用磁记录盘与间隙长度（delta）为0.50μm的磁头或 减。

    Magnetic recording disc comprising magnetic powder and a binder in a container which includes a nonwoven fabric liner comprising polypropylene and rayon fibers
    2.
    发明授权
    Magnetic recording disc comprising magnetic powder and a binder in a container which includes a nonwoven fabric liner comprising polypropylene and rayon fibers 失效
    磁性记录盘包括磁性粉末和粘合剂在容器中，该容器包括包含聚丙烯和人造纤维的非织造织物衬里

    公开(公告)号：US5370917A

    公开(公告)日：1994-12-06

    申请号：US74668

    申请日：1993-06-10

    申请人： Kazuhiro Niitsuma ,  Toshio Kawamata ,  Satoru Hayakawa

    发明人： Kazuhiro Niitsuma ,  Toshio Kawamata ,  Satoru Hayakawa

    IPC分类号： G11B5/82 ,  G11B23/033 ,  G11B23/50 ,  G11B5/00

    CPC分类号： G11B23/0332 ,  G11B23/505 ,  G11B5/825 ,  Y10S428/90

    摘要： A magnetic recording disc is disclosed which comprises a disc container with a liner comprising nonwoven fabric in which a flexible magnetic disc comprising a flexible non-magnetic support having on at least one side thereof a magnetic layer mainly comprising a ferromagnetic powder and a binder resin is rotably set, wherein said liner comprises (1) a nonwoven fabric layer mainly comprising rayon fiber on at least the side in contact with the magnetic layer, and (2) a nonwoven fabric layer mainly comprising polypropylene fiber, and said liner comprises from 70 to 80% by weight based on the liner of rayon fiber and from 20 to 30% by weight based on the liner of polypropylene fiber.

    摘要翻译： 公开了一种磁记录盘，其包括具有包括无纺织物的衬垫的盘容器，其中包括柔性非磁性支撑件的柔性磁盘在其至少一侧上具有主要包含铁磁粉末和粘合剂树脂的磁性层， 其特征在于，所述衬垫包括：（1）至少在与所述磁性层接触的一侧的主要包含人造丝纤维的非织造织物层，以及（2）主要包含聚丙烯纤维的非织造织物层，所述衬垫包括70〜 基于人造丝纤维的衬里为80重量％，基于聚丙烯纤维的衬里为20〜30重量％。

    Process for preparing a magnetic recording medium
    3.
    发明授权
    Process for preparing a magnetic recording medium 失效
    磁记录介质的制备方法

    公开(公告)号：US5300314A

    公开(公告)日：1994-04-05

    申请号：US993616

    申请日：1992-12-21

    申请人： Satoru Hayakawa ,  Kazuhiro Niitsuma ,  Toshio Kawamata

    发明人： Satoru Hayakawa ,  Kazuhiro Niitsuma ,  Toshio Kawamata

    IPC分类号： G11B5/842 ,  C09D5/23 ,  C09D7/12 ,  G11B5/73 ,  G11B5/738 ,  G11B5/848 ,  H01F10/02

    CPC分类号： G11B5/848

    摘要： The present invention relates to a magnetic recording medium comprising, in the following order:(a) a nonmagnetic support;(b) a nonmagnetic layer comprising nonmagnetic particles and a binder resin; and(c) a magnetic layer comprising ferromagnetic particles and a binder resin;wherein said magnetic layer has a thickness of 0.8 .mu.m or less and said nonmagnetic layer and said magnetic layer are formed by a process which comprises the steps of coating a nonmagnetic layer coating solution on said nonmagnetic support, and then subsequently coating a magnetic layer coating solution on said nonmagnetic layer coating solution wile said nonmagnetic layer is wet and, further, wherein the solvent used in said nonmagnetic layer coating solution has a higher boiling point than the solvent used in said magnetic layer coating solution.Further, the present invention relates to a process for preparing a magnetic recording medium, which comprises the steps of:(a) coating a nonmagnetic layer coating solution comprising nonmagnetic particles dispersed in a binder resin solution on a nonmagnetic support to form a nonmagnetic coating layer,(b) coating a magnetic layer coating solution comprising ferromagnetic particles dispersed in a binder resin solution on said nonmagnetic coating layer while said nonmagnetic coating layer is wet, and(c) drying to form a nonmagnetic layer and a magnetic layer on said nonmagnetic support;wherein the boiling point of the solvent used for said nonmagnetic layer coating solution is higher than the boiling point of the solvent used in said magnetic layer coating solution.

    摘要翻译： 磁记录介质技术领域本发明涉及一种磁记录介质，其特征在于，包括以下顺序：（a）非磁性载体; （b）包含非磁性颗粒和粘合剂树脂的非磁性层; 和（c）包含铁磁颗粒和粘合剂树脂的磁性层; 其中所述磁性层的厚度为0.8（my）m以下，所述非磁性层和所述磁性层通过以下步骤形成，所述方法包括以下步骤：在所述非磁性载体上涂覆非磁性层涂布溶液，然后涂覆磁性层 在所述非磁性层涂布溶液上的所述非磁性层涂布溶液的层状涂层溶液是湿的，此外，其中所述非磁性层涂布溶液中使用的溶剂的沸点高于所述磁性层涂布溶液中使用的溶剂。 此外，本发明涉及一种制备磁记录介质的方法，其包括以下步骤：（a）将包含分散在粘合剂树脂溶液中的非磁性颗粒的非磁性层涂布溶液涂布在非磁性载体上以形成非磁性涂层 ，（b）在所述非磁性涂层为湿的同时，将包含分散在所述非磁性涂层上的粘结剂树脂溶液中的铁磁性粒子的磁性层涂布溶液涂布在所述非磁性载体上，并且（c）在所述非磁性载体上形成非磁性层和磁性层 ; 其中用于所述非磁性层涂布溶液的溶剂的沸点高于所述磁性层涂布溶液中使用的溶剂的沸点。

    Flexible magnetic disk and process for preparing the same
    4.
    发明授权
    Flexible magnetic disk and process for preparing the same 失效
    灵活磁盘及其制备方法

    公开(公告)号：US5455093A

    公开(公告)日：1995-10-03

    申请号：US45252

    申请日：1993-04-13

    申请人： Toshio Kawamata ,  Masaya Kojima ,  Kazuhiro Niitsuma

    发明人： Toshio Kawamata ,  Masaya Kojima ,  Kazuhiro Niitsuma

    IPC分类号： G11B5/842 ,  C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/04 ,  G11B5/70 ,  G11B5/73 ,  G11B5/738 ,  B32B3/02 ,  B32B5/16 ,  G11B5/66

    CPC分类号： G11B5/738 ,  G11B5/70 ,  Y10T428/25 ,  Y10T428/256 ,  Y10T428/26 ,  Y10T428/265

    摘要： A flexible magnetic disk is disclosed, which comprises a non-magnetic support having thereon a non-magnetic layer comprising mainly a non-magnetic powder and a binder resin, and a magnetic layer comprising mainly a ferromagnetic layer and a binder resin, in this order, wherein at least a part of the non-magnetic powder in the non-magnetic layer is an electrically conductive powder, and therein the product Et.sup.3 of Young's modulus (E) of the flexible magnetic disk and the cube of the thickness (t) thereof is 50 to 210 g.multidot.mm. The magnetic layer preferably has a thickness of not more than 0.5 .mu.m and the ferromagnetic powder preferably is ferromagnetic metallic powder or ferromagnetic hexagonal ferrite powder.

    摘要翻译： 公开了一种柔性磁盘，其包括非磁性载体，其上具有主要包含非磁性粉末和粘合剂树脂的非磁性层，以及主要包含铁磁性层和粘合剂树脂的磁性层，按此顺序 其中非磁性层中的至少一部分非磁性粉末是导电粉末，其中柔性磁盘的杨氏模量（E）和其厚度（t）的立方体的乘积Et3 是50到210 gxmm。 磁性层优选具有不大于0.5μm的厚度，铁磁性粉末优选为强磁性金属粉末或铁磁六角铁氧体粉末。

    Magnetic recording disk loaded in a cartridge with a specified liner
    5.
    发明授权
    Magnetic recording disk loaded in a cartridge with a specified liner 失效
    磁记录盘装载在具有指定内衬的墨盒中

    公开(公告)号：US5179487A

    公开(公告)日：1993-01-12

    申请号：US831058

    申请日：1992-02-04

    申请人： Kazuhiro Niitsuma ,  Satoru Hayakawa

    发明人： Kazuhiro Niitsuma ,  Satoru Hayakawa

    IPC分类号： G11B5/708 ,  B32B5/08 ,  C09D5/23 ,  C09D7/12 ,  G11B23/033 ,  G11B23/50

    CPC分类号： B32B5/08 ,  G11B23/0332 ,  G11B23/505 ,  Y10S428/90

    摘要： A magnetic recording disk is disclosed which comprises a flexible magnetic disk comprising a nonmagnetic support having thereon a magnetic layer comprising ferromagnetic powders and binders which is rotatably loaded in a cartridge having a liner formed with a nonwoven fabric on the inside of the cartridge, wherein said liner comprises (A) two layers of a layer of the magnetic layer side comprising a nonwoven fabric of a mixed yarn of rayon fibers and polyester fibers formed on the side which contacts with the magnetic layer, and a layer of the cartridge side comprising a nonwoven fabric of acrylic fibers formed on the side which contacts with the cartridge; or (B) three layers of two layers comprising a nonwoven fabric of a mixed yarn of rayon fibers and polyester fibers, and an inter layer comprising acrylic fibers formed between the two layers.

    摘要翻译： 公开了一种磁记录盘，其包括柔性磁盘，其包括非磁性载体，其上具有包含铁磁粉末和粘合剂的磁性层，所述磁性层可旋转地装载在具有在所述盒的内部上形成有无纺布的衬垫的盒中，其中所述 衬垫包括（A）两层一层磁性层一侧，其包含在与磁性层接触的侧面上形成的人造丝纤维和聚酯纤维的混合纱线的无纺织物，以及包含无纺布 形成在与盒接触的一侧上的丙烯酸纤维织物; 或（B）包含人造丝纤维和聚酯纤维的混合纱的非织造织物的两层两层，以及在两层之间形成的包含丙烯酸纤维的层。