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1. 发明授权

US07763352B2 Ferromagnetic powder, and coating material and magnetic recording medium using same 有权
标题翻译：铁磁粉末，涂料和使用磁记录介质的材料
公开(公告)号：US07763352B2
公开(公告)日：2010-07-27
申请号：US11520624
申请日：2006-09-14
申请人： Yoshiyuki Shoji , Toshihiko Ueyama
发明人： Yoshiyuki Shoji , Toshihiko Ueyama
IPC分类号： G11B5/66
CPC分类号： H01F1/09 , G11B5/70621 , G11B5/70647 , G11B5/70657 , G11B5/70663 , G11B5/70689 , G11B5/714 , H01F1/065 , Y10T428/2982 , Y10T428/32
摘要： A magnetic powder is provided composed of particles having a balanced shape and distribution, the particles having a small, uniform volume, making it possible to achieve improved density and reliability of a coating type magnetic recording medium. The magnetic powder has Fe as a main component, and is comprised of particles having a cross-section perpendicular to the particle major axis that is substantially round or elliptical, wherein a standard geometrical deviation indicating the variation in cross-sectional area thereof is within the range of 1.01 to 3.0. The invention is also directed to a magnetic powder in which the standard geometrical deviation indicating the variation in the particle volume is within the range of 1.01 to 4.0, and the standard geometrical deviation indicating variation in the flat acicularity is within 1.01 to 2.0.
摘要翻译：由具有平衡形状和分布的颗粒构成的磁粉由于具有体积小，体积均匀的粒子，能够提高涂布型磁记录介质的密度和可靠性。该磁性粉末以Fe为主成分，由具有垂直于大致圆形或椭圆形的粒子长轴的截面的粒子构成，其中，表示其横截面积的变化的标准几何偏差在范围为1.01〜3.0。本发明还涉及一种磁性粉末，其中指示颗粒体积变化的标准几何偏差在1.01至4.0的范围内，并且指示平针对性变化的标准几何偏差在1.01至2.0之内。

2. 发明授权

US5531922A Granulated particles for magnetic particles for magnetic recording, and process for producing the same 失效
标题翻译：用于磁记录的磁性颗粒的造粒颗粒及其制造方法
公开(公告)号：US5531922A
公开(公告)日：1996-07-02
申请号：US527017
申请日：1995-09-12
申请人： Kenji Okinaka , Yasutaka Ota , Kohji Mori , Hirofumi Kawasaki , Masayuki Uegami , Akio Mishima , Katsumi Yamashita , Minoru Yamasaki , Manabu Matsumoto , Kunihiro Kouchi , Hiroki Kamon
发明人： Kenji Okinaka , Yasutaka Ota , Kohji Mori , Hirofumi Kawasaki , Masayuki Uegami , Akio Mishima , Katsumi Yamashita , Minoru Yamasaki , Manabu Matsumoto , Kunihiro Kouchi , Hiroki Kamon
IPC分类号： G11B5/706 , G11B5/714 , H01F1/06 , C01G49/02
CPC分类号： G11B5/714 , G11B5/70647 , H01F1/061
摘要： Disclosed herein are granulated particles for magnetic particles for magnetic recording, comprising: acicular ferric hydroxide oxide particles or acicular iron oxide particles; and at least one selected from the group consisting of semisynthetic starch and semisynthetic cellulose and having a bulk density of not less than 0.3 g/cm.sup.3 and a powdering ratio of not more than 40%, and a process for producing the granulated particles, and magnetic particles obtained from such granulated particles.
摘要翻译：本文公开了用于磁记录的磁性颗粒的造粒颗粒，包括：针状氧化铁氧化物颗粒或针状氧化铁颗粒; 以及选自由半合成淀粉和半合成纤维素组成的组中的至少一种，其堆积密度不小于0.3g / cm 3，粉化比不大于40％，以及制备造粒颗粒的方法和磁性从这种造粒颗粒获得的颗粒。

3. 发明授权

US4382982A Process for protecting magnetic particles with chromium oxide 失效
标题翻译：用氧化铬保护磁性颗粒的方法
公开(公告)号：US4382982A
公开(公告)日：1983-05-10
申请号：US212336
申请日：1980-12-02
申请人： Francis D. Whillans
发明人： Francis D. Whillans
IPC分类号： B22F1/02 , B01J20/28 , B01J20/32 , B01J47/00 , B01J47/018 , B03C1/01 , C01G37/02 , C01G37/027 , C01G49/00 , G11B5/706 , H01F1/11 , H01F1/24 , H01F1/36 , B05D5/12 , B05D7/00
CPC分类号： B82Y30/00 , B01J20/0218 , B01J20/0229 , B01J20/06 , B01J20/261 , B01J20/267 , B01J20/28009 , B01J20/28047 , B01J20/3078 , B01J20/3204 , B01J20/3236 , B01J20/327 , B01J20/3282 , B01J20/3289 , B01J47/007 , B03C1/01 , C01G37/02 , G11B5/70647 , H01F1/112 , H01F1/24 , C01P2004/61 , C01P2004/62 , C01P2004/64 , Y10S210/924
摘要： A method for the preparation of magnetic particulate matter coated with a protective layer of chromium(III) hydroxide, oxyhydroxide or oxide, optionally crosslinked with polyacrylic acid, which process comprises a first step of depositing a hydrogel of chromium(III) hydroxide onto magnetic material in a desired particulate form, a second step of heating to form chromium(III) hydroxide, oxyhydroxide or oxide, and a third optional step, which may precede or follow the said second step, of crosslinking with polyacrylic acid. The coated protected magnetic particles are useful for the preparation of composite magnetic polymeric particles for use in processes involving ion exchange, filtration and adsorption.
摘要翻译：一种用于制备涂覆有氢氧化铬（III），羟基氧化物或氧化物保护层（任选与聚丙烯酸交联）的磁性颗粒物质的方法，该方法包括将氢氧化铬（III）的水凝胶沉积到磁性材料上的第一步骤以所需的颗粒形式，加热形成氢氧化铬（III），羟基氧化物或氧化物的第二步骤，以及在所述第二步骤之前或之后的第三任选步骤与聚丙烯酸交联。涂覆的受保护的磁性颗粒可用于制备用于涉及离子交换，过滤和吸附的方法的复合磁性聚合物颗粒。

4. 发明授权

US4212903A Improving the magnetic properties of gamma-iron (III) oxide 失效
标题翻译：提高γ-铁（III）氧化物的磁性能
公开(公告)号：US4212903A
公开(公告)日：1980-07-15
申请号：US770989
申请日：1977-02-22
申请人： Georg Schnell , Fritz Hammon , Manfred Ohlinger
发明人： Georg Schnell , Fritz Hammon , Manfred Ohlinger
IPC分类号： G11B5/706 , H01F10/00 , B05D5/12
CPC分类号： G11B5/70647 , G11B5/70652 , G11B5/70657 , Y10S428/90
摘要： The invention relates to a process for improving the magnetic properties, especially the remanent magnetization, of gamma-iron(III) oxide which can be used advantageously as the magnetic component in magnetic recording media exhibiting reduced print-through. For this purpose, a gamma-iron(III) oxide manufactured according to known processes is heated at temperatures of from 400.degree. to 700.degree. C., the magnetic pigment having basic compounds on the crystal surface during this heat treatment and retaining a pH value above 8 until heating is over. Gamma-iron(III) oxide magnetic pigments treated in this way are particularly suitable for the manufacture of low-noise magnetic recording media with high remanent magnetization and particularly low print-through.
摘要翻译：本发明涉及一种用于改善氧化铁（III）的磁性能，特别是剩余磁化的方法，该方法可以有利地用作磁记录介质中的磁性组分，这些磁性组分表现出减少的打印通量。为此，根据已知方法制造的γ-铁（III）氧化物在400℃至700℃的温度下加热，该磁性颜料在该热处理期间在晶体表面上具有碱性化合物，并保持pH值高于8，直到加热结束。以这种方式处理的氧化镍（III）磁性颜料特别适用于制造具有高剩余磁化强度和特别是低打印通量的低噪声磁记录介质。

5. 发明授权

US4061726A Manufacture of acicular .gamma.-iron(III) oxide 失效
标题翻译：针状{65-铁（III）氧化物的制造
公开(公告)号：US4061726A
公开(公告)日：1977-12-06
申请号：US732901
申请日：1976-10-15
申请人： Manfred Ohlinger , Eduard Schoenafinger , Guenter Vaeth , Heinz Stritzinger , Eberhard Koester , Hans Henning Schneehage , Werner Steck
发明人： Manfred Ohlinger , Eduard Schoenafinger , Guenter Vaeth , Heinz Stritzinger , Eberhard Koester , Hans Henning Schneehage , Werner Steck
IPC分类号： C01G49/02 , C01G49/06 , C21B15/00 , G01N21/89 , G11B5/706 , H01F1/11
CPC分类号： G11B5/70652 , C01G49/06 , G01N21/8901 , G11B5/70647 , C01P2004/10 , C01P2004/51 , C01P2004/54 , C01P2004/62 , C01P2006/11 , C01P2006/12 , C01P2006/42
摘要： Goethite is obtained by reacting an aqueous solution of an iron (II) salt with an aqueous solution of an alkali metal hydroxide and oxidizing the resulting iron(II) hydroxide. The oxidation is carried out in three stages. In the first stage, from 4 to 15% by weight are oxidized in the course of from 0.4 to 5 hours, in the second stage from 60 to 85% by weight are oxidized in the course of from 1.5 to 6 hours and in a third stage the remaining amount of iron is oxidized.
摘要翻译：通过使铁（II）盐的水溶液与碱金属氢氧化物的水溶液反应并氧化得到的氢氧化铁（II），得到针铁矿。氧化分三个阶段进行。在第一阶段，4至15重量％在0.4至5小时的过程中被氧化，在第二阶段中，以60至85重量％的氧化为1.5至6小时，阶段剩余量的铁被氧化。

6. 发明授权

US3958068A Process for the production of powdered magnetic material 失效
标题翻译：粉状磁性材料的生产工艺
公开(公告)号：US3958068A
公开(公告)日：1976-05-18
申请号：US257716
申请日：1972-05-30
申请人： Shinji Umeki , Fujio Shibata
发明人： Shinji Umeki , Fujio Shibata
IPC分类号： C23C18/34 , C23C18/50 , G11B5/706 , H01F1/06
CPC分类号： C23C18/50 , C23C18/34 , G11B5/70647 , H01F1/065 , Y10S428/90 , Y10T428/2991
摘要： A process is disclosed for the production of powdered magnetic material for use in magnetic recording materials. The process comprises the steps of dispersing finely divided particles of a ferromagnetic oxide into an aqueous solution, dissolving therein salts of one or more ferromagnetic metals and a water soluble reducing agent, and then heating the dispersion while stirring to form and deposit a coating of the ferromagnetic metal (or alloy) on the surface of the finely divided particles of ferromagnetic oxide.
摘要翻译：公开了用于生产用于磁记录材料的粉末状磁性材料的方法。该方法包括以下步骤：将细分散的铁磁性氧化物颗粒分散在水溶液中，溶解其中一种或多种铁磁性金属和水溶性还原剂的盐，然后在搅拌下加热分散体以形成和沉积强磁性金属（或合金）在铁磁氧化物的微细颗粒的表面上。

7. 发明授权

US3795542A Method of making a magnetic recording and storage device 失效
标题翻译：制造磁记录和存储设备的方法
公开(公告)号：US3795542A
公开(公告)日：1974-03-05
申请号：US3795542D
申请日：1971-06-09
申请人： CORNING GLASS WORKS
发明人： HALABY S , KENNY N , MURPHY J
IPC分类号： C23C14/58 , G11B5/706 , H01F10/20 , C22C39/00
CPC分类号： C23C14/5806 , C23C14/58 , C23C14/5846 , G11B5/70647 , G11B5/70652 , H01F10/20 , Y10S428/90
摘要： A METHOD OF MAKING A MAGNETIC RECORDING AND STORAGE DEVICE COMPRISING THE STEP OF FORMING AN ALIPHA FERRIC OXIDE FILM OR AN IRON FILM ON A SURFACE PF AN INORGANIC AND NON-MAGNETIC SUBSTRATE OR SUPPORT MEMBER. THE SUBSTRATE AND FILM COMBINATION ARE THEN SUBJECTED TO A CONTROLLED ATMOSPHERE AT AN ELEVATED TEMPEATURE, WHICH CONVERTS THE FILM TO MAGNETITE SUITABLE FOR USE IN MAGNETIC RECORDING AN STORAGE DEVICES. THE MAGNETITE FIL, MAY THEN BE FURTHER CONVERTED TO A FILM OF GAMMA FERRIC OXIDE, ALSO SUITABLE FOR USE IN MAGNETIC RECORDING AND STORAGE DEVICES. BY SUBJECTING THE SUBSTRATE AND MAGNETITE FILM TO AN OXIDIZING ATMOSPHERE AT A SECOND PREDETERMINED ELEVATED TEMPERATURE.

8. 发明授权

US3480555A Sols of gamma ferric oxide and their preparation 失效
标题翻译：游离氧化铁及其制备方法
公开(公告)号：US3480555A
公开(公告)日：1969-11-25
申请号：US3480555D
申请日：1964-05-11
申请人： DIAMOND SHAMROCK CORP
发明人： JACKSON WILLIAM M , HENGEVELD FRANK W
IPC分类号： B01J13/00 , B01J41/04 , C01G49/06 , G11B5/706 , H01F1/44 , H01F1/34 , B01J1/04
CPC分类号： B82Y30/00 , B01J13/0017 , B01J41/04 , C01G49/06 , C01P2004/64 , G11B5/70647 , G11B5/70652 , H01F1/445

9. 发明授权

US3015627A Gamma ferric oxide for magnetic impulse record members 失效
标题翻译：伽马三氧化二铁磁冲击记录成员
公开(公告)号：US3015627A
公开(公告)日：1962-01-02
申请号：US4120960
申请日：1960-07-06
申请人： C K WILLIAMS & CO
发明人： AYERS JOSEPH W , STEPHENS ROBERT A
IPC分类号： G11B5/706
CPC分类号： G11B5/70647 , G11B5/70652 , G11B5/70657

10. 发明授权

US5648014A Acicular magnetic iron oxide particles and process for producing the same 失效
标题翻译：针状磁性氧化铁颗粒及其制造方法
公开(公告)号：US5648014A
公开(公告)日：1997-07-15
申请号：US569764
申请日：1995-12-08
申请人： Mitsuaki Hatatani , Osamu Okimoto , Toshitada Shigemura , Yoshifumi Fukuhara , Hideaki Sadamura
发明人： Mitsuaki Hatatani , Osamu Okimoto , Toshitada Shigemura , Yoshifumi Fukuhara , Hideaki Sadamura
IPC分类号： C01G49/08 , C01G49/00 , G11B5/706 , H01F1/11 , H01F1/36 , C09C1/22
CPC分类号： H01F1/112 , G11B5/70647 , G11B5/70689 , Y10T428/2991
摘要： Acicular magnetic iron oxide particles comprise:acicular magnetite particles having 10 to 24% by weight of ferrous as core particles;a magnetite coating which is formed on the surfaces of said acicular magnetite particles by epitaxial growth and which has maghemite at least in a part of the surface of said magnetite coating; anda cobalt-containing oxide layer which is formed on said magnetite coating and which contains cobalt of 1.5 to 2.5 wt % based on the total weight of said acicular magnetic iron oxide particles.
摘要翻译：针状磁性氧化铁颗粒包括：具有10至24重量％的作为核心颗粒的亚铁的针状磁铁矿颗粒; 磁铁矿涂层，其通过外延生长形成在所述针状磁铁矿颗粒的表面上，并且至少在所述磁铁矿涂层的表面的一部分中具有磁赤铁矿; 以及形成在所述磁铁矿涂层上并含有基于所述针状磁性氧化铁颗粒的总重量为1.5至2.5重量％的钴的含钴氧化物层。

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