公开(公告)号：US5126215A

公开(公告)日：1992-06-30

申请号：US337686

申请日：1989-04-13

申请人： Masashi Aonuma ,  Hiroaki Araki ,  Hiroshi Hashimoto ,  Tsutomu Okita ,  Yasuo Nishikawa

发明人： Masashi Aonuma ,  Hiroaki Araki ,  Hiroshi Hashimoto ,  Tsutomu Okita ,  Yasuo Nishikawa

IPC分类号： G11B5/712

CPC分类号： G11B5/712 ,  Y10S428/90

摘要： A magnetic recording medium comprising a nonmagnetic support having formed thereon a magnetic layer containing ferromagnetic particles dispersed in a binder, wherein the surface of the magnetic layer has pores of (a) at most 50 .ANG. in the average value of pore inlet diameters measured by a nitrogen gas adsorption method and (b) at least 25 .ANG. in the half value width of the frequency distribution curve of the pore inlet diameters.

摘要翻译： 一种磁记录介质，包括在其上形成有分散在粘合剂中的铁磁颗粒的磁性层的非磁性载体，其中所述磁性层的表面具有孔（a）至多为50的孔，孔的平均值由 氮气吸附法和（b）孔入口直径频率分布曲线半值宽度中至少25 ANGSTROM。

公开(公告)号：US4959263A

公开(公告)日：1990-09-25

申请号：US195224

申请日：1988-05-18

申请人： Masashi Aonuma ,  Tsutomu Okita ,  Hiroshi Hashimoto ,  Hiroaki Araki ,  Kiyotaka Fukino ,  Kiyomi Ejiri

发明人： Masashi Aonuma ,  Tsutomu Okita ,  Hiroshi Hashimoto ,  Hiroaki Araki ,  Kiyotaka Fukino ,  Kiyomi Ejiri

IPC分类号： G11B5/702 ,  G11B5/712 ,  G11B5/714

CPC分类号： G11B5/7026 ,  G11B5/712 ,  G11B5/714 ,  Y10S428/90 ,  Y10T428/257

摘要： A magnetic recording medium is described, comprising a nonmagnetic support having thereon a magnetic layer containing a binder which is cross-linkable or polymerizable by radiation irradiation and ferromagnetic particles, the ferromagnetic particles being metal or metal alloy particles mainly comprising iron having a crystal size of 300 .ANG. or less, having an atomic ratio of oxygen atoms to iron atoms of from 1.6 to 3.0 on the surface of the particles, and the magnetic layer having been irradiated with radiation, and comprising a nonmagnetic support having thereon a magnetic layer containing a binder comprising thermoplastic resins, thermosetting resins, reactive type resins and mixtures thereof and ferromagnetic particles, said ferromagnetic particles being metal or metal alloy particles mainly comprising iron having a crystal size of 250 .ANG. or less, and having an atomic ratio of oxygen atoms to iron atoms of from 1.6 to 3.0 on the surface of said particles.

摘要翻译： 描述了一种磁记录介质，其包括其上具有含有可通过辐射照射和铁磁性颗粒可交联或可聚合的粘合剂的磁性层的非磁性载体，所述铁磁颗粒是主要包含具有晶体尺寸的铁的金属或金属合金颗粒 300或更小，在颗粒表面上的氧原子与铁原子的原子比为1.6至3.0，并且已经辐照辐照的磁性层，并且包含其上具有含有粘合剂的磁性层的非磁性载体 包括热塑性树脂，热固性树脂，反应型树脂及其混合物和铁磁颗粒，所述铁磁性颗粒是主要包含结晶尺寸为250或更小的铁并且具有氧原子与铁原子的原子比的金属或金属合金颗粒 在所述颗粒的表面上为1.6至3.0。

公开(公告)号：US6149989A

公开(公告)日：2000-11-21

申请号：US84866

申请日：1998-05-28

申请人： Hiroaki Araki ,  Tsuneo Yoshida ,  Toshichika Aoki ,  Masashi Aonuma ,  Kazuo Kato ,  Kazutoshi Katayama ,  Hiroshi Hashimoto

发明人： Hiroaki Araki ,  Tsuneo Yoshida ,  Toshichika Aoki ,  Masashi Aonuma ,  Kazuo Kato ,  Kazutoshi Katayama ,  Hiroshi Hashimoto

IPC分类号： G11B5/706 ,  G11B5/66

CPC分类号： G11B5/7085 ,  G11B5/70621 ,  Y10S428/90

摘要： The present invention discloses a magnetic recording particulate mediumhaving amagnetic layer on anonmagnetic support, the magnetic layer containing a ferromagnetic metal powder and a binder and having a coercive force of 1,400 to 1,700 Oe, wherein the ferromagnetic metal powder is spindle-shaped particles consisting essentially of Fe and having a Co/Fe ratio of from 1 to 5 atomic %, an Al/Fe ratio of from 5 to 15 atomic %, an average major axis length of 0.1 to 0.2 .mu.m and a specific surface area of 40 to 50 m.sup.2 /g, and the binder contains a polyurethane consisting essentially of a diol component comprising a polyether polyol and a polyester polyol and a polyisocyanate component. This magnetic recording particulate medium is characterized by minimal head wear, freedom from head clogging, and satisfactory electromagnetic characteristics.

摘要翻译： 本发明公开了一种磁性载体上的磁记录微粒介质，其磁性层含有强磁性金属粉末和粘合剂，矫顽力为1,400至1700He，其中铁磁性金属粉末为纺锤形颗粒，主要由 Fe，Co / Fe比为1〜5原子％，Al / Fe比为5〜15原子％，平均长轴长度为0.1〜0.2μm，比表面积为40〜50μm / g，并且粘合剂含有主要由包含聚醚多元醇和聚酯多元醇和多异氰酸酯组分的二醇组分组成的聚氨酯。 这种磁记录颗粒介质的特征在于最小的头部磨损，不受头部堵塞和令人满意的电磁特性。

公开(公告)号：US5387464A

公开(公告)日：1995-02-07

申请号：US925032

申请日：1992-08-05

申请人： Kazuo Kato ,  Kenichi Masuyama ,  Hiroaki Araki ,  Hiroshi Hashimoto

发明人： Kazuo Kato ,  Kenichi Masuyama ,  Hiroaki Araki ,  Hiroshi Hashimoto

IPC分类号： G11B5/716 ,  C09D5/23 ,  G11B5/702 ,  G11B5/73 ,  G11B5/738 ,  G11B5/00

CPC分类号： G11B5/738 ,  G11B5/7021 ,  G11B5/7023 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/265 ,  Y10T428/31554 ,  Y10T428/31562 ,  Y10T428/31565 ,  Y10T428/3158 ,  Y10T428/31609 ,  Y10T428/31736 ,  Y10T428/3175 ,  Y10T428/31797 ,  Y10T428/31935

摘要： A magnetic recording medium is disclosed, comprising a non-magnetic support with an undercoating layer having formed thereon one or more magnetic layers. The undercoating layer contains a polyester resin or polyurethane resin having at least one polar group selected from the group consisting of --SO.sub.3 M, --OSO.sub.3 M, --COOM, and --OPO.sub.3 M.sub.2 (wherein M represents a hydrogen atom, an alkali metal, or an ammonium base, and M in different polar group or plural M's within the same polar group may be the same or different), and a glass transition temperature (Tg) of from 40.degree. C. to 80.degree. C. The magnetic layer contains a binder resin having at least one polar group selected from the same group as defined above. The recording medium has excellent adhesion between the non-magnetic support and the magnetic layer, high running durability and excellent electromagnetic characteristics.

摘要翻译： 公开了一种磁记录介质，其包括具有在其上形成有一个或多个磁性层的底涂层的非磁性载体。 底涂层含有具有至少一个选自-SO 3 M，-OSO 3 M，-COOM和-OPO 3 M 2的极性基团的聚酯树脂或聚氨酯树脂（其中M表示氢原子，碱金属或铵基 ，M不同极性基团中的M或相同极性基团中的多个M可以相同或不同），玻璃化转变温度（Tg）为40℃〜80℃。磁性层含有具有 选自与上述定义相同的至少一个极性基团。 记录介质在非磁性载体和磁性层之间具有优异的粘附性，高运行耐久性和优异的电磁特性。

公开(公告)号：US5176955A

公开(公告)日：1993-01-05

申请号：US687133

申请日：1991-04-18

申请人： Kiyomi Ejiri ,  Hiroaki Araki ,  Hiroshi Hashimoto

发明人： Kiyomi Ejiri ,  Hiroaki Araki ,  Hiroshi Hashimoto

IPC分类号： C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/04 ,  G11B5/70 ,  G11B5/702 ,  G11B5/706 ,  G11B5/708 ,  G11B5/84 ,  G11B5/842

CPC分类号： G11B5/7013 ,  G11B5/7023 ,  G11B5/706 ,  Y10S428/90 ,  Y10T428/265 ,  Y10T428/3158 ,  Y10T428/31605 ,  Y10T428/31609

摘要： A magnetic recording medium improved in electromagnetic characteristics, running durability and running properties is disclosed, comprising a non-magnetic support and at least one magnetic layer formed thereon, said magnetic layer having a ferromagnetic powder dispersed in a binder, wherein said magnetic layer contains at least one member selected from the group consisting of an aromatic phosphoric acid or a derivative thereof, an aromatic phosphonic acid or a derivative thereof, and an aromatic sulfonic acid or a derivative thereof, and wherein said ferromagnetic powder has a pH of at least 7, and said binder is a vinyl chloride copolymer having an epoxy group and a hydroxyl group attached to an alkyl chain group. Also, a method for producing a magnetic recording medium is disclosed which comprises the steps of kneading and dispersing a ferromagnetic powder having a pH of at least 7, at least one member selected from the group consisting of an aromatic phosphoric acid or a derivative thereof, an aromatic phosphonic acid or a derivative thereof, and an aromatic sulfonic acid or a derivative thereof, and a vinyl chloride copolymer having an epoxy group and a hydroxyl group attached to an alkyl chain group, together with a solvent; and then optionally adding at least one additive thereto, and mixing to prepare a magnetic coating; and then applying the resulting magnetic coating to a non-magnetic support; drying, calendering and then heat treating.

摘要翻译： 公开了一种提高电磁特性，运行耐久性和运行性能的磁记录介质，其包括非磁性支撑体和形成在其上的至少一个磁性层，所述磁性层具有分散在粘合剂中的铁磁粉末，其中所述磁性层包含在 选自芳香族磷酸或其衍生物，芳香族膦酸或其衍生物，芳香族磺酸或其衍生物的至少一种，其中所述铁磁粉末的pH至少为7， 并且所述粘合剂是具有连接到烷基链基团上的环氧基和羟基的氯乙烯共聚物。 另外，公开了一种制造磁记录介质的方法，该方法包括以下步骤：将pH至少为7的铁磁性粉末，至少一种选自芳族磷酸或其衍生物， 芳香族膦酸或其衍生物，芳香族磺酸或其衍生物，以及具有与烷基链基连接的环氧基和羟基的氯乙烯共聚物与溶剂; 然后任选地向其中加入至少一种添加剂，并混合以制备磁性涂层; 然后将所得的磁性涂层施加到非磁性载体上; 干燥，压延，然后热处理。

公开(公告)号：US5510177A

公开(公告)日：1996-04-23

申请号：US994522

申请日：1992-12-21

申请人： Kenichi Masuyama ,  Kazuo Kato ,  Hiroaki Araki

发明人： Kenichi Masuyama ,  Kazuo Kato ,  Hiroaki Araki

IPC分类号： G11B5/702 ,  C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/06 ,  G11B5/708 ,  G11B5/716 ,  G11B5/73 ,  B32B5/16 ,  G11B5/66

CPC分类号： G11B5/716 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/259 ,  Y10T428/31551 ,  Y10T428/31663 ,  Y10T428/31721 ,  Y10T428/31725 ,  Y10T428/31786 ,  Y10T428/31855 ,  Y10T428/31909 ,  Y10T428/31935 ,  Y10T428/31971

摘要： A magnetic recording medium having two or more magnetic layers is disclosed, comprising a first magnetic layer and a second magnetic layer which-have been provided in this order on a surface of a nonmagnetic support, and which contain ferromagnetic particles and a binder, wherein said second magnetic layer (outermost layer) contains nonmagnetic particles having a pH of less than 7, and a Mohs' hardness of 6 or more, in an amount of from 1 to 20 parts by weight, per 100 parts by weight of the ferromagnetic particles in the second magnetic layer, and said first magnetic layer contains nonmagnetic particles having a pH of 7 or more, and a Mohs' hardness of 6 or more, in an amount of from 5 to 50 parts by weight, per 100 parts by weight of the ferromagnetic particles in the first magnetic layer.

摘要翻译： 公开了一种具有两个或多个磁性层的磁记录介质，包括在非磁性载体的表面上依次提供的第一磁性层和第二磁性层，并且含有铁磁颗粒和粘合剂，其中所述 第二磁性层（最外层）每100重量份的铁磁颗粒含有pH为小于7的非磁性颗粒，并且莫氏硬度为6或更大，为1至20重量份 所述第二磁性层和所述第一磁性层包含pH为7以上的非磁性颗粒，并且每100重量份的所述第一磁性层含有5至50重量份的莫氏硬度为6以上的莫氏硬度 第一磁性层中的铁磁颗粒。

公开(公告)号：US4791021A

公开(公告)日：1988-12-13

申请号：US106683

申请日：1987-10-13

申请人： Kunihiko Honda ,  Toshihiko Miura ,  Hiroaki Araki

发明人： Kunihiko Honda ,  Toshihiko Miura ,  Hiroaki Araki

IPC分类号： G11B5/706 ,  G11B5/712

CPC分类号： G11B5/70694 ,  G11B5/70626 ,  G11B5/712 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/2991 ,  Y10T428/31609 ,  Y10T428/31935

摘要： A magnetic recording medium is described, having improved carrier noise ratio and weather resistance, by controlling the content and the crystal size of iron nitride which contains iron oxide or .epsilon.-Fe.sub.x N (2

摘要翻译： 通过控制含有氧化铁或ε-FexN（2

公开(公告)号：US6037051A

公开(公告)日：2000-03-14

申请号：US52161

申请日：1998-03-31

申请人： Takeshi Kakuta ,  Hiroaki Doushita ,  Hiroaki Araki

发明人： Takeshi Kakuta ,  Hiroaki Doushita ,  Hiroaki Araki

IPC分类号： G11B5/706 ,  G11B5/708

CPC分类号： G11B5/70621 ,  G11B5/70615 ,  G11B5/7085 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257

摘要： The present invention discloses a magnetic tape for use in a magnetic recording/reproduction system having a relative speed of 15 m/s or more between a tape and a head for recording and reproducing the tape; the magnetic tape having at least one magnetic layer provided on a nonmagnetic support, the magnetic layer comprising an Al-containing ferromagnetic powder and alumina dispersed in a binder, and a backcoat layer provided on the surface of the nonmagnetic support opposite to the magnetic layer, wherein the intensity ratio between Al and Fe (Al/Fe), as measured by ESCA, in the surface of the magnetic layer is 0.15 to 0.25. The use of this magnetic tape enables improved electromagnetic characteristics and durability to be achieved at a high recording density and a high transfer speed.

摘要翻译： 本发明公开了一种用于磁记录/再现系统中的磁带，其磁带和用于记录和再现磁带的磁头之间的相对速度为15m / s以上; 所述磁带具有设置在非磁性载体上的至少一个磁性层，所述磁性层包括分散在粘合剂中的含Al铁磁性粉末和氧化铝，以及设置在与磁性层相对的非磁性载体表面上的背涂层， 其中通过ESCA测量的在磁性层表面的Al和Fe（Al / Fe）之间的强度比为0.15至0.25。 使用该磁带能够在高记录密度和高传送速度下实现改进的电磁特性和耐久性。

公开(公告)号：US4803131A

公开(公告)日：1989-02-07

申请号：US110317

申请日：1987-10-20

申请人： Shinji Saito ,  Hiroaki Araki ,  Kiyomi Ejiri ,  Hiroshi Ogawa ,  Chiaki Mizuno

发明人： Shinji Saito ,  Hiroaki Araki ,  Kiyomi Ejiri ,  Hiroshi Ogawa ,  Chiaki Mizuno

IPC分类号： C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D163/00 ,  C09D163/08 ,  C09D175/06 ,  G11B5/702 ,  G11B5/708 ,  G11B5/70

CPC分类号： G11B5/7023 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/31511

摘要： An improvement of a magnetic recording medium comprising a nonmagnetic support and a magnetic recording layer provided on the support which comprises a binder and a ferromagnetic powder dispersed therein is disclosed. The binder contains a resin component having an epoxy group and the ferromagnetic powder contains water in an amount corresponding to moles of 1-5 times as much as the number of moles of the epoxy group contained in the binder.

摘要翻译： 公开了一种磁性记录介质的改进，其包括设置在载体上的非磁性载体和磁记录层，该载体包含粘合剂和分散在其中的铁磁性粉末。 粘合剂含有具有环氧基的树脂成分，铁磁性粉末含有相当于粘合剂中所含环氧基的摩尔数的摩尔量的1-5倍的水。

公开(公告)号：US06686024B2

公开(公告)日：2004-02-03

申请号：US10131179

申请日：2002-04-25

申请人： Mikio Ohno ,  Naoto Murao ,  Toshichika Aoki ,  Hiroaki Araki

发明人： Mikio Ohno ,  Naoto Murao ,  Toshichika Aoki ,  Hiroaki Araki

IPC分类号： G11B5708

CPC分类号： G11B5/70615 ,  G11B5/7085 ,  G11B5/71 ,  G11B5/84 ,  Y10T428/25

摘要： A magnetic recording medium is formed from a non-magnetic support, and a magnetic layer formed on the support and including mainly a binder resin and a ferromagnetic metal powder including mainly Fe. The magnetic layer includes an abrasive and a lubricant. The abrasive present on the surface of the magnetic layer satisfies the relationship 0.01≦H15/H10≦0.3 where H10 denotes the number of particles per unit area having a height less than 10 nm (particles/&mgr;m2) and H5 denotes the number of particles per unit area having a height equal to or greater than 15 nm (particles/&mgr;m2). The magnetic recording medium has a surface lubricant index of 3 to 11. The height of the abrasive particles can be controlled by, for example, a blade treatment using an abrasive tape (LTBL system) or a diamond powder-studded rotating roll (DWBL system).

摘要翻译： 磁记录介质由非磁性载体和形成在载体上的磁性层形成，主要包括粘合剂树脂和主要包含Fe的强磁性金属粉末。 磁性层包括研磨剂和润滑剂。 存在于磁性层表面上的研磨剂满足0.01 <= H15 / H10 <= 0.3的关系，其中H10表示高度小于10nm的单位面积的颗粒数（颗粒/母体2），H5表示 高度等于或大于15nm的单位面积的颗粒数（颗粒/母体2）。 磁记录介质具有3至11的表面润滑指数。可以通过例如使用研磨带（LTBL系统）或金刚石粉末旋转辊（DWBL系统）的刀片处理来控制磨料颗粒的高度 ）。