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公开(公告)号：EP0165076A3
公开(公告)日：1987-10-07
申请号：EP85304321
申请日：1985-06-17
Applicant: Hitachi Maxell Ltd.
Inventor： Kuse, Sadamu , Kawarai, Seigi
IPC: G11B05/708 , G11B05/712
CPC classification number: G11B5/708 , Y10S428/90 , Y10T428/25 , Y10T428/2982 , Y10T428/2991 , Y10T428/30
Abstract: A magnetic recording medium having an excellent electromagnetic property with a low frictional magnetic layer surface which comprises a base material and a magnetic layer provided thereon, said magnetic layer comprising magnetic powder, a resinous binder and graphitized carbon black powder, optionally with non-graphitized carbon black powder.
Abstract translation: 一种磁记录介质，其具有优良的电磁特性和低摩擦磁性层表面，所述低摩擦磁性层表面包括基材和设置在其上的磁性层，所述磁性层包含磁性粉末，树脂粘合剂和石墨化炭黑粉末，任选地具有非石墨化碳 黑火药。
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公开(公告)号：EP0177939A3
公开(公告)日：1988-01-07
申请号：EP85112759
申请日：1985-10-08
Applicant: SONY CORPORATION
Inventor： Ninomiya, Yoshinobu c/o Sony Corporation , Muroyama, Masakazu c/o Sony Corporation , Sugiyama, Masayoshi c/o Sony Corporation , Hashimoto, Akira c/o Sony Corporation
IPC: G11B05/708
CPC classification number: G11B5/708 , Y10S428/90 , Y10T428/254 , Y10T428/256 , Y10T428/257 , Y10T428/31609
Abstract: A magnetic recording medium comprising a non-magnetic base and a magnetic layer attached thereto consisting essentially of magnetic powders and a binder. Included within the binder are spherical small sized particles of a benzoguanamine-formaldehyde resin or a benzoguanamine- melamine-formaldehyde resin which serve to improve the running characteristics, reduce the friction coefficient, and improve the strength of the layer.
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公开(公告)号：WO1992022893A1
公开(公告)日：1992-12-23
申请号：PCT/JP1992000753
申请日：1992-06-12
Applicant: TDK CORPORATION
Inventor： TDK CORPORATION , HITOMI, Yohsuke , IKARASHI, Tsunehiko
IPC: G11B05/708
CPC classification number: G11B5/708 , Y10S428/90 , Y10T428/25 , Y10T428/265 , Y10T428/30
Abstract: To improve electromagnetic conversion characteristics by lowering a friction coefficient of a coating type magnetic recording medium and improving travelling stability, a magnetic layer contains carbon black having a mean primary particle diameter of 25 to 65 mνm and a standard deviation σ of a particle diameter distribution of 12 to 24 mνm.
Abstract translation: 为了通过降低涂布型磁记录介质的摩擦系数和通过提高滚动稳定性来改善电磁转换特性，磁性层含有具有 平均主粒径在25-65mm之间，粒度分布在12-24mm之间的西格玛标准偏差。
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公开(公告)号：EP0243829A3
公开(公告)日：1988-11-30
申请号：EP87105755
申请日：1987-04-18
Applicant: BASF Aktiengesellschaft
Inventor： Melzer, Milena , Meyer, Bernd, Dr. , Sommermann, Friedrich, Dr. , Klumpp, Peter , Kreitner, Ludwig, Dr. , Lenz, Werner, Dr.
IPC: G11B05/708 , G11B05/706 , G11B05/72
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公开(公告)号：EP0138036A3
公开(公告)日：1986-04-30
申请号：EP84110616
申请日：1984-09-06
Applicant: Hitachi Maxell Ltd.
Inventor： Morioka, Akira , Matsuura, Takeshi , Takahira, Yoshiyuki
IPC: G11B05/708
CPC classification number: G11B5/708 , G02B6/4428 , Y10S428/90 , Y10T428/24248 , Y10T428/25 , Y10T428/256 , Y10T428/257
Abstract: A magnetic recording medium having a high durability with good electro-magnetic properties, which comprises a base material and a magnetic layer provided thereon, said magnetic layer containing magnetic particles and a binder, characterized in that the magnetic layer further comprises alpha-Fe 2 O 3 particles, Al 2 O, particles and Cr 2 0 3 particles.
Abstract translation: 一种具有高耐久性的具有良好电磁性能的磁记录介质，其包括基材和设置在其上的磁性层，所述磁性层含有磁性颗粒和粘合剂，其特征在于，所述磁性层还包含α-Fe 2 O 3颗粒， Al2O3颗粒和Cr2O3颗粒。
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Patent Agency Ranking
公开(公告)号：EP0270171A3
公开(公告)日：1988-07-06
申请号：EP87202314
申请日：1987-11-25
Applicant: PD Magnetics B.V.
IPC: G11B05/708
CPC classification number: G11B5/708
Abstract: A magnetic recording element comprising a carrier and a magnetic coating which contains a magnetic pigment of CrO₂ particles, a binder, auxiliary substances and a non-magnetic pigment of particles of a lead and/or magnesium compound.
Abstract translation: 一种磁记录元件，包括载体和磁性涂层，其含有CrO 2颗粒的磁性颜料，粘合剂，辅助物质和铅和/或镁化合物颗粒的非磁性颜料。
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公开(公告)号：EP0176368A3
公开(公告)日：1987-10-07
申请号：EP85306864
申请日：1985-09-26
Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY
IPC: G11B05/71 , G11B05/708
CPC classification number: G11B5/708 , G11B5/70652 , G11B5/71 , Y10S428/90 , Y10T428/24248 , Y10T428/24273 , Y10T428/24413 , Y10T428/25 , Y10T428/256 , Y10T428/257
Abstract: Magnetizable layer of a diskette, as in the prior art, comprises acicular magnetizable particles and alpha-Fe 2 0 3 particles dispersed in nonmagnetizable binder. The magnetizable layer of the novel diskette differs from prior diskettes in that the alpha-Fe 2 0 3 particles are acicular and comprise from 2 to 7 weight percent of said layer. Preferably the alpha-Fe 2 0 3 particles together with the other particles comprise from 69 to 73 percent by weight of the magnetizable layer. This allows the layer to be desirably smooth and also sufficiently porous to absorb a topical lubricant in an amount of at least 2 percent by weight of the layer. A preferred topical lubricant is a mixture of a long-chain fatty acid such as oleic acid and an ester of a long-chain fatty acid such as hexadecyl stearate.
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公开(公告)号：EP0184034A3
公开(公告)日：1988-05-04
申请号：EP85114367
申请日：1985-11-12
Applicant: SUMITOMO SPECIAL METAL CO., LTD.
Inventor： Suzuki, Takao , Sagawa, Masato
IPC: G11B05/62 , G11B05/64 , G11B05/708 , G11B11/03 , G11C13/06
CPC classification number: G11B5/656 , G11B5/64 , Y10S428/90 , Y10S428/928 , Y10T428/26 , Y10T428/265
Abstract: A perpendicular magnetic recording medium is fabricated based on R 21-60 (Fe 1-y Co y ) z M 0-10 wherein z is balance and at least 70 at % of R is Nd and/or Pr, the balance of R being one or more of other rare earth elements, and wherein y is less than 0.5 by atomic ratio. M is at least one of various additional metal elements. The Curie temperature Tc is between 70 to 250°C; the saturation magnetization Ms is about 450 emu/cc or more; the uniaxial perpendicular magnetic anisotropy constant Ku of 2.5 x 10 s erg/cc or more is attained. Kerr rotation angle is 0.3 degree or more, which provides a magneto-optic recording medium. Since light rare earth elements having the collinear alignment of magnetic moment with Fe are used as a key element, it is possible to fabricate uniform perpendicular magnetic anisotropy thin films in a mass production scale at a low cost.
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公开(公告)号：EP0179463A3
公开(公告)日：1988-01-07
申请号：EP85113473
申请日：1985-10-23
Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
Inventor： Kadokura, Hidekimi , Umezaki, Hiroshi , Murakami, Hideaki
IPC: G11B05/708
CPC classification number: G11B5/7085 , Y10S428/90 , Y10T428/25 , Y10T428/256 , Y10T428/257 , Y10T428/259 , Y10T428/2991 , Y10T428/2995 , Y10T428/2998
Abstract: A magnetic recording medium comprising a substrate and a magnetic layer formed on the substrate and comprising an inorganic powder having an average primary particle size of 0.35 µm or less, an angle of repose of 40° or more and a Mors hardness of 5 or more as a reinforcing material, and a magnetic powder, is excellent in wear resistance and durability of the magnetic layer and improves wear and injury of a magnetic head.
Abstract translation: 1.一种磁记录介质，其特征在于，具有基材和在该基材上形成的磁性层，该磁性层含有平均一次粒径为0.35μm以下，静止角为40°以上，莫氏硬度为5以上的无机粉末， 增强材料和磁性粉末，磁性层的耐磨性和耐久性优异，并且改善了磁头的磨损和伤害。
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公开(公告)号：EP0139403A3
公开(公告)日：1986-12-17
申请号：EP84305795
申请日：1984-08-24
Applicant: International Business Machines Corporation
Inventor： Economy, James , Zachariades, Anagnostis Efsatathios
IPC: G11B05/84 , G11B05/842 , G11B05/718 , G11B05/708 , G11B05/702
Abstract: A method for improving the durability, surface finish, and magnetic properties of a magnetic recording disk, the recording disk having a magnetic coating material with load bearing particles therein, by applying thereto a deformational force which exceeds the elastic limit of the coating material.
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