公开(公告)号：US06936328B2

公开(公告)日：2005-08-30

申请号：US10395275

申请日：2003-03-25

申请人： Satoru Hayakawa ,  Yuichiro Murayama

发明人： Satoru Hayakawa ,  Yuichiro Murayama

IPC分类号： G11B5/70 ,  G11B5/702 ,  G11B5/738 ,  G11B5/733

CPC分类号： G11B5/738 ,  G11B5/70 ,  G11B5/7026 ,  Y10T428/24355 ,  Y10T428/25 ,  Y10T428/2982

摘要： A magnetic recording medium comprising: a support; a subbing layer comprising a radiation-curable resin; a nonmagnetic layer comprising a nonmagnetic powder and a binder; and at least one magnetic layer comprising a ferromagnetic powder and a binder, in this order, wherein the subbing layer has a thickness of from 0.05 to 1.0 μm, and the nonmagnetic powder has an average acicular ratio of 8 or more and has a form of a raft.

摘要翻译： 一种磁记录介质，包括：支撑体; 包含辐射固化树脂的底层; 包含非磁性粉末和粘合剂的非磁性层; 以及包含铁磁粉末和粘合剂的至少一个磁性层，其中所述底层具有0.05至1.0μm的厚度，并且所述非磁性粉末的平均针状比为8或更大，并且具有 筏子

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。

公开(公告)号：US5358777A

公开(公告)日：1994-10-25

申请号：US19257

申请日：1993-02-18

申请人： Masaya Kojima ,  Satoru Hayakawa ,  Toshio Kawamata

发明人： Masaya Kojima ,  Satoru Hayakawa ,  Toshio Kawamata

IPC分类号： G11B5/82 ,  C09D5/23 ,  C09D7/12 ,  G11B5/70 ,  G11B5/73 ,  G11B5/733 ,  G11B5/738 ,  G11B5/842 ,  G11B5/00

CPC分类号： G11B5/738 ,  Y10S428/90 ,  Y10T428/24942 ,  Y10T428/265

摘要： A magnetic recording medium comprising (A) a non-magnetic support; (B) a non-magnetic layer comprising mainly a non-magnetic powder and a binder resin; and (C) a magnetic layer comprising mainly a ferromagnetic powder and a binder resin, wherein said non-magnetic layer is coated on said non-magnetic support; and said magnetic layer is coated over the previously formed non-magnetic layer while the previously formed non-magnetic layer is still wet; the thickness of the magnetic layer is 0.6 .mu.m or less; the Young's Modulus of the magnetic layer is from 50% to 95% of the Young's Modulus of the non-magnetic layer, and the glass transition temperature of the magnetic layer is lower than that of the non-magnetic layer. The magnetic recording medium has good electromagnetic characteristics and excellent running stability and running durability. It is suitable as a disc medium for high-density recording at a shortest recording wavelength of 1.5 .mu.m or less, displaying excellent overwriting characteristic in high-density recording. The running reliability of the magnetic recording medium is good.

摘要翻译： 一种磁记录介质，包括（A）非磁性载体; （B）主要包含非磁性粉末和粘合剂树脂的非磁性层; 和（C）主要包含铁磁性粉末和粘合剂树脂的磁性层，其中所述非磁性层涂覆在所述非磁性载体上; 并且所述磁性层涂覆在先前形成的非磁性层上，同时先前形成的非磁性层仍然是湿的; 磁性层的厚度为0.6μm以下; 磁性层的杨氏模量是非磁性层的杨氏模量的50％至95％，并且磁性层的玻璃化转变温度低于非磁性层的玻璃化转变温度。 磁记录介质具有良好的电磁特性和良好的运行稳定性和运行耐久性。 适合于在1.5μm以下的最短记录波长下进行高密度记录的盘式介质，在高密度记录中显示优异的重写特性。 磁记录介质的运行可靠性好。

公开(公告)号：US07086623B2

公开(公告)日：2006-08-08

申请号：US10775059

申请日：2004-02-11

申请人： Masami Sato ,  Tadashi Ishiguro ,  Satoru Hayakawa

发明人： Masami Sato ,  Tadashi Ishiguro ,  Satoru Hayakawa

IPC分类号： G11B23/107

CPC分类号： G11B23/107 ,  G11B5/71 ,  G11B5/716 ,  G11B5/73 ,  G11B5/735 ,  G11B23/26 ,  Y10T428/24967

摘要： A leader tape having: a support; an upper layer containing a powder, a binder, and a lubricant; and a lower layer containing a powder, a binder, and a lubricant which is at least 1.12 times as much as the lubricant of the upper layer; wherein the support, the lower layer, and the upper layer is in this order.

摘要翻译： 一个领带，有：支持; 含有粉末，粘合剂和润滑剂的上层; 和含有粉末，粘合剂和润滑剂的下层，其为上层润滑剂的至少1.12倍; 其中，所述支撑体，所述下层和所述上层依次为所述顺序。

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％。

公开(公告)号：US5104751A

公开(公告)日：1992-04-14

申请号：US644861

申请日：1991-01-23

申请人： Takao Ohya ,  Satoru Hayakawa

发明人： Takao Ohya ,  Satoru Hayakawa

IPC分类号： G11B5/71 ,  G11B5/725

CPC分类号： G11B5/71 ,  G11B5/725 ,  Y10S428/90

摘要： A magnetic recording medium having an improved running durability is disclosed, which comprises a non-magnetic support having formed thereon a magnetic layer mainly composed of a ferromagnetic powder and a binder resin, wherein an ester compound selected from the group consisting of a phthalic acid diester represented by formula (I) and a benzenetricarboxylic acid triester represented by formula (II) is contained in the magnetic layer or coated on the magnetic layer: ##STR1## wherein R.sup.1 and R.sup.2, which may be the same or different, each represents a straight chain or branched alkyl or alkenyl group and the sum of the carbon atoms of R.sup.1 and R.sup.2 is at least 22; and ##STR2## wherein R.sup.3, R.sup.4 and R.sup.5, which may be the same or different, each represents a straight chain or branched alkyl or alkenyl group and the sum of the carbon atoms of R.sup.3, R.sup.4 and R.sup.5 is at least 22, said ester compound being contained in the magnetic layer in an amount of from 1 to 25% by weight based on the amount of the ferromagnetic power in the magnetic layer or being coated on the magnetic layer in an amount of from 2 to 50 mg/m.sup.2.

公开(公告)号：US5061564A

公开(公告)日：1991-10-29

申请号：US382934

申请日：1989-07-21

申请人： Takao Ohya ,  Jun Nakagawa ,  Satoru Hayakawa ,  Yasuo Nishikawa ,  Tsutomu Okita ,  Hiroshi Hashimoto

发明人： Takao Ohya ,  Jun Nakagawa ,  Satoru Hayakawa ,  Yasuo Nishikawa ,  Tsutomu Okita ,  Hiroshi Hashimoto

IPC分类号： G11B5/71 ,  G11B5/72

CPC分类号： G11B5/71 ,  G11B5/72 ,  Y10S428/90 ,  Y10T428/31 ,  Y10T428/31551 ,  Y10T428/3158

摘要： A magnetic recording medium is disclosed, which comprises a non-magnetic support having provided thereon a magnetic layer mainly composed of a ferromagnetic powder and a binder resin comprising (i) a polymer having at least one polar group selected from --SO.sub.3 M.sup.1, --OSO.sub.3 M.sup.1, --COOM.sup.1, ##STR1## wherein M.sup.1 represents a hydrogen atom, Li, Na or NR.sub.4 (wherein R represents a hydrogen atom, an alkyl group, an alkenyl group, or an alkanol group), and M.sup.2 represents a hydrogen atom, Li, Na, an alkyl group, or NR.sub.4 (wherein R has the same significance as defined above); or (ii) a compound having at least one polar group selected from --SO.sub.3 M.sup.3, --COOM.sup.3, and --PO.sub.3 (M.sup.3).sub.2 (wherein M.sup.3 represents a hydrogen atom, an alkali metal, or an ammonium group) and containing at least one carbon-carbon unsaturated bond in the molecule, said magnetic layer containing at least one ester compound represented by following formula (I), (II), or (III), and when the binder resin comprises the compound (ii), the magnetic layer is irradiated by radiations: ##STR2## wherein R.sup.1 represents a straight chain or branched alkyl group having from 7 to 29 carbon atoms or a straight chain or branched alkenyl group having from 7 to 29 carbon atoms; l, k, m, and n represents an integer; l and n each is at least 2, and the sum of n and m and the sum of k and l are from 7 to 33.

摘要翻译： 公开了一种磁记录介质，其包括其上设置有主要由铁磁粉末和粘合剂树脂构成的磁性层的非磁性载体，所述磁性层包含（i）具有至少一个选自-SO 3 M 1，-OSO 3 M 1， -COOM1，其中M1表示氢原子，Li，Na或NR4（其中R表示氢原子，烷基，烯基或链烷醇基），M2表示氢原子，Li，Na ，烷基或NR4（其中R具有与上述相同的含义）; 或（ii）具有选自-SO 3 M 3，-COOM 3和-PO 3（M3）2中的至少一个极性基团的化合物（其中，M3表示氢原子，碱金属或铵基），并且含有至少一个碳 所述磁性层含有至少一种由下式（I），（II）或（III）表示的酯化合物，并且当粘合剂树脂包含化合物（ii）时，磁性层为 （I）其中R1表示具有7至29个碳原子的直链或支链烷基或具有7个碳原子的直链或支链烯基 至29个碳原子; l，k，m，n表示整数; l和n各自为至少2，n和m之和以及k和l之和为7至33。