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1. 发明授权

US4917947A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US4917947A
公开(公告)日：1990-04-17
申请号：US125277
申请日：1987-11-25
申请人： Kideaki Kosha , Kiyomi Ejiri , Toshihiko Miura , Koyotaka Fukino , Kouichi Masaki
发明人： Kideaki Kosha , Kiyomi Ejiri , Toshihiko Miura , Koyotaka Fukino , Kouichi Masaki
IPC分类号： G11B5/708
CPC分类号： G11B5/7085 , Y10S428/90 , Y10T428/257 , Y10T428/2991
摘要： A magnetic recording medium is described, comprising a non-magnetic support having provided thereon a magnetic layer comprising a binder having dispersed therein a ferromagnetic powder, in which said magnetic layer contains surface-coated inorganic particles having a Mohs hardness of 5 or more as an abrasive, said coated inorganic particles being present in a larger proportion in the vicinity of the surface of the magnetic layer. The magnetic recording medium has improved electromagnetic characteristics and improved running durability.
摘要翻译：描述了一种磁记录介质，其包括非磁性载体，其上设置有包含分散有铁磁性粉末的粘合剂的磁性层，其中所述磁性层含有莫氏硬度为5以上的表面被覆无机颗粒，作为研磨剂，所述涂覆的无机颗粒以更大的比例存在于磁性层的表面附近。磁记录介质具有改进的电磁特性和改善的运行耐久性。

2. 发明授权

US4965125A Magnetic recording medium and the method for preparing the same 失效
标题翻译：磁记录介质及其制备方法
公开(公告)号：US4965125A
公开(公告)日：1990-10-23
申请号：US182672
申请日：1988-04-18
申请人： Kouichi Masaki , Hideaki Kosha , Toshihiko Miura , Yasuo Tamai
发明人： Kouichi Masaki , Hideaki Kosha , Toshihiko Miura , Yasuo Tamai
IPC分类号： C09D5/23 , G11B5/70 , G11B5/708 , G11B5/71 , G11B5/84
CPC分类号： G11B5/708 , G11B5/71 , Y10S428/90 , Y10T428/257 , Y10T428/30
摘要： A magnetic recording medium is described, comprising a non-magnetic support having thereon a magnetic layer containing ferromagnetic particles dispersed in a binder, the ferromagnetic layer containing abrasive agent particles alone or in combination with lubricating agent particles, wherein the weight ratio of (a) the abrasive agent particles which are present, or each of the abrasive agent particles and lubricating agent particles which are present, within 1 .mu.m in a thickness direction from the surface of the magnetic layer to (b) the abrasive agent particles or each of the abrasive agent particles and lubricating agent particles which are present, within the whole magnetic layer is at least 100/(thickness of the magnetic layer -1) % in which the "thickness of the magnetic layer" represents the thickness in ".mu.m" and is 2 .mu.m or more.A method for preparing a magnetic recording medium comprising: coating on a non-magnetic support a first coating composition having ferromagnetic particles dispersed in a binder, and simultaneously or successively coating thereon a second coating composition having a binder in which there is despersed abrasive agent particles alone or in combination with lubricating agent particles.
摘要翻译：描述了一种磁记录介质，其包括其上具有包含分散在粘合剂中的铁磁性颗粒的磁性层的非磁性载体，所述铁磁层单独地包含研磨剂颗粒或与润滑剂颗粒组合，其中（a）存在的研磨剂颗粒或存在的研磨剂颗粒和润滑剂颗粒在从磁性层的表面到厚度方向上的1μm以内，（b）研磨剂颗粒或每个存在于整个磁性层内的研磨剂颗粒和润滑剂颗粒至少为“μm”中的“磁性层的厚度”表示厚度的至少100 /（磁性层的厚度）％），是2亩以上。一种制备磁记录介质的方法，包括：在非磁性载体上涂覆分散在粘合剂中的铁磁颗粒的第一涂料组合物，同时或依次在其上涂覆具有粘合剂的第二涂料组合物，其中存在分散的研磨剂颗粒单独或与润滑剂颗粒组合。

3. 发明授权

US06638599B2 Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US06638599B2
公开(公告)日：2003-10-28
申请号：US09876995
申请日：2001-06-11
申请人： Kouichi Masaki , Toshihiko Miura
发明人： Kouichi Masaki , Toshihiko Miura
IPC分类号： G11B5706
CPC分类号： G11B5/70615 , Y10T428/24355 , Y10T428/256 , Y10T428/265 , Y10T428/2991
摘要： A ferromagnetic metal powder for magnetic recording containing iron as the main constituent and MAl2O4 (wherein M is a transition metal), wherein the coercive force (Hc) thereof is from 135 to 240 kA/m, the saturation magnetization (&sgr;s) is from 100 to 150 A·m2/kg, the average major axis length of the particles thereof is from 30 to 80 nm, the average acicular ratio of the particles is from 4.0 to 8.0, and the variation coefficient of the major axis lengths is from 3 to 25%. A magnetic recording medium having on a support a non-magnetic layer and at least a magnetic layer containing the above-described ferromagnetic metal powder, said medium has good short wavelength output and good S/N.
摘要翻译：以铁为主要成分的磁记录用铁磁性金属粉末和MAl 2 O 4（其中M为过渡金属），其矫顽力（Hc）为135〜240kA / m，饱和磁化强度（sigmas）为100 至150Am 2 / kg，其颗粒的平均长轴长度为30至80nm，颗粒的平均针状比为4.0至8.0，长轴长度的变化系数为3 至25％。一种磁记录介质，其具有支撑非磁性层和至少含有上述铁磁性金属粉末的磁性层，所述介质具有良好的短波长输出和良好的S / N。

4. 发明授权

US5770302A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5770302A
公开(公告)日：1998-06-23
申请号：US725244
申请日：1996-10-04
申请人： Kouichi Masaki , Toshihiko Miura
发明人： Kouichi Masaki , Toshihiko Miura
IPC分类号： B22F1/00 , G11B5/706 , G11B5/714 , G11B5/738 , H01F1/047
CPC分类号： G11B5/714 , G11B5/738 , Y10S428/90 , Y10T428/25 , Y10T428/256
摘要： A magnetic recording medium is disclosed, which comprises a nonmagnetic support having thereon a magnetic layer containing at least ferromagnetic metal particles, wherein said ferromagnetic metal particles have a coercive force of from 1,700 to 3,000 Oe, an average long axis length of from 30 to 80 nm, an average acicular ratio of from 2.0 to 5.0, and a crystallinity of from 30 to 100%.
摘要翻译：公开了一种磁记录介质，其包括其上具有至少含有铁磁性金属颗粒的磁性层的非磁性载体，其中所述强磁性金属颗粒的矫顽力为1700至3,000Oe，平均长轴长度为30至80 nm，平均针状比为2.0〜5.0，结晶度为30〜100％。

5. 发明授权

US5698311A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5698311A
公开(公告)日：1997-12-16
申请号：US674126
申请日：1996-07-01
申请人： Kouichi Masaki , Toshihiko Miura
发明人： Kouichi Masaki , Toshihiko Miura
IPC分类号： C09D5/23 , C09D7/12 , G11B5/70 , G11B5/706 , G11B5/714 , G11B5/738
CPC分类号： G11B5/70621 , G11B5/70 , G11B5/70615 , G11B5/714 , Y10S428/90 , Y10T428/256 , Y10T428/26
摘要： A magnetic recording medium comprising a nonmagnetic support having provided thereon at least a magnetic layer containing ferromagnetic metal particles, wherein the magnetic layer has a coercive force of 2,000 to 3,000 Oe and a Bm of 3,800 to 5,500 G, the ferromagnetic metal particles has an average major axis length of 0.05 to 0.12 .mu.m and an average aspect ratio of 4.0 to 10.0, the average number of crystallites constituting the ferromagnetic metal particles per particle is from 2.0 to 5.0, and the crystallites has an average aspect ratio of 1.0 to 2.0.
摘要翻译：一种磁记录介质，包括至少在其上设置有含有铁磁性金属颗粒的磁性层的非磁性载体，其中所述磁性层的矫顽力为2,000〜3000Oe，Bm为3,800〜5,500G，所述强磁性金属粒子的平均粒径长轴长度为0.05〜0.12μm，平均纵横比为4.0〜10.0，构成每粒子的铁磁性金属粒子的平均微晶数为2.0〜5.0，平均纵横比为1.0〜2.0。

6. 发明申请

US20050089722A1 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US20050089722A1
公开(公告)日：2005-04-28
申请号：US10968951
申请日：2004-10-21
申请人： Kouichi Masaki
发明人： Kouichi Masaki
IPC分类号： G11B5/70 , G11B5/706 , G11B5/714
CPC分类号： G11B5/714 , G11B5/70 , G11B5/70678
摘要： To provide a magnetic recording medium which undergoes little effect of thermal fluctuation and provides a high short wavelength output and C/N ratio when reproduction is conducted using MR head, the magnetic recording medium includes a non-magnetic layer having a non-magnetic powder dispersed in a binder provided on a support and a magnetic layer having a ferromagnetic powder dispersed in a binder provided on the non-magnetic layer, wherein the ferromagnetic powder comprises a hexagonal ferrite magnetic powder having an average diameter of from 10 to 35 nm and a coercive force of from 135 to 400 kA/m; the magnetic layer has a coercive force of from 135 to 440 kA/m; and a product of an anisotropic magnetic field of the magnetic layer and an average particle volume of the hexagonal ferrite magnetic powder is from 1.2×106 to 2.4×106 kA/m·nm3.
摘要翻译：为了提供一种磁记录介质，其在几乎没有热波动的作用下产生，并且当使用MR磁头进行再现时提供高的短波长输出和C / N比，磁记录介质包括非磁性粉末分散的非磁性层在设置在支撑体上的粘合剂中和具有分散在设置在非磁性层上的粘合剂中的铁磁性粉末的磁性层上，其中所述铁磁性粉末包括平均直径为10至35nm的六角铁氧体磁性粉末和矫顽力强度135〜400 kA / m; 磁性层的矫顽力为135〜440kA / m; 并且磁性层的各向异性磁场和六方晶系铁氧体磁粉的平均粒子体积的乘积为1.2×10 -6〜2.4×10 6 kA / m。 nm 3。

7. 发明申请

US20050003235A1 Process of producing magnetic recording medium 审中-公开
标题翻译：制造磁记录介质的方法
公开(公告)号：US20050003235A1
公开(公告)日：2005-01-06
申请号：US10879618
申请日：2004-06-30
申请人： Kouichi Masaki
发明人： Kouichi Masaki
IPC分类号： G11B5/70 , G11B5/714 , G11B5/738 , G11B5/84 , G11B5/842 , G11B5/68
CPC分类号： G11B5/8404 , G11B5/70 , G11B5/714 , G11B5/73 , Y10T428/256 , Y10T428/257 , Y10T428/265
摘要： A process for producing a magnetic recording medium comprising the steps of applying a coating composition containing non-magnetic powder and a binder on a support to form a non-magnetic layer having a thickness of 0.5 to 2.5 μm, a specific surface area of 20 to 120 m2/ml, a pore volume of 0.15 to 0.40 ml/ml, and a mean pore radius of 3 to 16 nm and applying a coating composition containing ferromagnetic powder and a binder on the non-magnetic layer to form a magnetic layer having a thickness of 25 to 150 nm.
摘要翻译：一种制备磁记录介质的方法，包括以下步骤：将含有非磁性粉末和粘合剂的涂料组合物施加到载体上以形成厚度为0.5至2.5μm的非磁性层，比表面积为20至 120m 2 / ml，孔体积为0.15〜0.40ml / ml，平均孔半径为3〜16nm，在非磁性层上涂布含有铁磁粉末和粘合剂的涂料组合物，形成磁性层的厚度为25〜150nm。

8. 发明授权

US06727009B2 Magnetic recording medium comprising a magnetic layer exhibiting low &Dgr;M value 有权
标题翻译：磁记录介质包括显示低ΔM值的磁性层
公开(公告)号：US06727009B2
公开(公告)日：2004-04-27
申请号：US09940527
申请日：2001-08-29
申请人： Kouichi Masaki , Toshiyuki Suzuki
发明人： Kouichi Masaki , Toshiyuki Suzuki
IPC分类号： B32B516
CPC分类号： G11B5/70678 , G11B5/00813
摘要： A magnetic recording medium comprises a non-magnetic layer containing a non-magnetic powder abd a binder provided on a support, and a magnetic layer containing a ferromagnetic powder and a binder provided on the non-magnetic layer, wherein the magnetic layer contains a hexagonal ferrite magnetic powder having an average tabular diameter of 10 to 28 nm and has a coercive force (Hc) of 135 to 400 kA/m, a ratio (Hc/Hk) of the Hc to an anisotropic magnetic field (Hk) of 0.3 to 0.6, and a maximum value of &Dgr;M of 0 to 0.10.
摘要翻译：一种磁记录介质，包括一非磁性层，该非磁性层含有设置在载体上的粘结剂和非磁性粉末，以及含有铁磁粉末和粘结剂的磁性层，该磁性层设置在非磁性层上，其中该磁性层含有六方晶系平均片状直径为10〜28nm，矫顽力（Hc）为135〜400kA / m，Hc与各向异性磁场（Hk）的比（Hc / Hk）为0.3〜 0.6，最大值ΔM为0〜0.10。

9. 发明授权

US4500599A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US4500599A
公开(公告)日：1985-02-19
申请号：US613748
申请日：1984-05-23
申请人： Hiroshi Ogawa , Chiaki Mizuno , Kouichi Masaki , Masaaki Suzuki , Yasuo Tamai
发明人： Hiroshi Ogawa , Chiaki Mizuno , Kouichi Masaki , Masaaki Suzuki , Yasuo Tamai
IPC分类号： C09D5/23 , C09D7/12 , G11B5/706 , G11B5/714 , G11B5/70 , B32B5/16
CPC分类号： G11B5/70652 , Y10S428/90 , Y10T428/265
摘要： A magnetic recording medium comprising a nonmagnetic base having formed thereon a magnetic layer containing a fine particulate ferromagnetic material dispersed in a binder is disclosed. The ferromagnetic material is a mixture of two fine ferromagnetic powders (a) and (b) in a weight ratio of from 90/10 to 30/70. The powder (a) comprises .gamma.-Fe.sub.2 O.sub.3 particles having a coercivity (Hc) of 330 to 390 Oe and a saturation magnetization (.sigma.s) of 68 to 80 emu/g at a maximum magnetizing force (Hm) of 5 KOe, and a specific surface area of 18 to 25 m.sup.2 /g, and powder (b) comprises .gamma.-Fe.sub.2 O.sub.3 particles having a coercivity (Hc) of 400 to 450 Oe and a saturation magnetization (.sigma.s) of 65 to 78 emu/g at a maximum magnetizing force (Hm) of 5 KOe, and a specific surface area of 22 to 30 m.sup.2 /g. The tape has the ability to clearly and faithfully reproduce high fidelity sound.
摘要翻译：公开了一种磁记录介质，其包括在其上形成有包含分散在粘合剂中的细颗粒铁磁材料的磁性层的非磁性基底。铁磁材料是两种细铁磁粉末（a）和（b）的重量比为90/10至30/70的混合物。粉末（a）包括在5KOe的最大磁化力（Hm）下矫顽力（Hc）为330至390Oe，饱和磁化强度（sigma s）为68至80emu / g的γ-Fe 2 O 3颗粒，以及比表面积为18〜25m2 / g，粉末（b）包含矫顽力（Hc）为400〜450Oe，饱和磁化强度（sigma）为65〜78emu / g的γ-Fe 2 O 3粒子磁化力（Hm）为5KOe，比表面积为22〜30m2 / g。磁带具有清晰忠实地再现高保真度的声音的能力。

10. 发明授权

US06790523B2 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US06790523B2
公开(公告)日：2004-09-14
申请号：US10402966
申请日：2003-04-01
申请人： Kouichi Masaki , Takako Ozawa
发明人： Kouichi Masaki , Takako Ozawa
IPC分类号： G11B5706
CPC分类号： G11B5/70678
摘要： A magnetic recording medium comprising: a support; and at least a magnetic layer comprising a hexagonal ferrite powder and a binder, wherein the hexagonal ferrite powder is of magnetoplumbite type and has an average diameter of 15 to 35 nm and an alkaline earth element to iron ratio of 0.10 to 0.15 in terms of peak intensity ratio analyzed by electron spectroscopy for chemical analysis.
摘要翻译：一种磁记录介质，包括：支撑体; 以及至少包含六方铁氧体粉末和粘合剂的磁性层，其中所述六方晶系铁氧体粉末为磁铅矿型，平均直径为15〜35nm，碱土元素与铁的比例为0.10〜0.15 通过电子光谱分析化学分析的强度比。

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