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公开(公告)号：US5582914A
公开(公告)日：1996-12-10
申请号：US197180
申请日：1994-02-16
CPC分类号： G11B5/70694 , Y10S428/90 , Y10T428/2982 , Y10T428/2991 , Y10T428/2993
摘要： Disclosed herein are magnetic iron oxide particles which have a spindle shape and a substantially uniform particle size and shape, and are substantially free of dendrites and have a large axial ratio (major axial diameter/minor axial diameter) and an excellent print-through characteristic, and a method of producing the same.
摘要翻译： 本文公开了具有纺锤形状和基本上均匀的粒度和形状的磁性氧化铁颗粒，并且基本上没有树枝状结构并且具有大的轴向比（主轴向直径/次轴向直径）和优异的印刷特性， 及其制造方法。
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公开(公告)号：US5314750A
公开(公告)日：1994-05-24
申请号：US967522
申请日：1992-10-27
CPC分类号： G11B5/70694 , Y10S428/90 , Y10T428/2982 , Y10T428/2991 , Y10T428/2993
摘要： Disclosed herein are magnetic iron oxide particles which have a spindle shape and a substantially uniform particle size and shape, and are substantially free of dendrites and have a large axial ratio (major axial diameter/minor axial diameter) and an excellent print-through characteristic, and a method of producing the same.
摘要翻译： 本文公开了具有纺锤形状和基本上均匀的粒度和形状的磁性氧化铁颗粒，并且基本上没有树枝状结构并且具有大的轴向比（主轴向直径/次轴向直径）和优异的印刷特性， 及其制造方法。
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3.发明授权
公开(公告)号：US5599378A
公开(公告)日：1997-02-04
申请号：US450205
申请日：1995-05-25
申请人： Akio Mishima , Tosiharu Harada , Mamoru Tanihara , Yasutaka Ota , Kenji Okinaka , Kohji Mori , Hirofumi Kawasaki , Norimichi Nagai , Katsunori Fujimoto , Yoshiro Okuda
发明人： Akio Mishima , Tosiharu Harada , Mamoru Tanihara , Yasutaka Ota , Kenji Okinaka , Kohji Mori , Hirofumi Kawasaki , Norimichi Nagai , Katsunori Fujimoto , Yoshiro Okuda
CPC分类号： G11B5/70621 , G11B5/70615 , G11B5/714 , H01F1/061
摘要： Disclosed herein are spindle-shaped magnetic iron based alloy particles containing at least one selected from the group consisting of Ni, Al, Si, P, Co, Mg, B and Zn, which have a particle length of 0.05 to 0.40 .mu.m, a crystallite size of 110 to 180 .ANG., a specific surface area of 30 to 60 m.sup.2 /g, a coercive force of 1,300 to 1,700 Oe and a saturation magnetization (.sigma.s) of not less than 100 emu/g and a process for producing the same.
摘要翻译： 本文公开了含有选自Ni，Al，Si，P，Co，Mg，B和Zn中的至少一种的锭状磁铁基合金粒子，其粒径为0.05〜0.40μm，a 微晶尺寸为110〜180，比表面积为30〜60m2 / g，矫顽力为1300〜1700Oe，饱和磁化强度（sigma）为100emu / g以上， 相同。
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公开(公告)号：US5466306A
公开(公告)日：1995-11-14
申请号：US118287
申请日：1993-09-09
申请人： Akio Mishima , Tosiharu Harada , Mamoru Tanihara , Yasutaka Ota , Kenji Okinaka , Kohji Mori , Hirofumi Kawasaki , Norimichi Nagai , Katsunori Fujimoto , Yoshiro Okuda
发明人： Akio Mishima , Tosiharu Harada , Mamoru Tanihara , Yasutaka Ota , Kenji Okinaka , Kohji Mori , Hirofumi Kawasaki , Norimichi Nagai , Katsunori Fujimoto , Yoshiro Okuda
CPC分类号： G11B5/70621 , G11B5/70615 , G11B5/714 , H01F1/061
摘要： Disclosed herein are spindle-shaped magnetic iron based alloy particles containing at least one selected from the group consisting of Ni, Al, Si, P, Co, Mg, B and Zn, which have a particle length of 0.05 to 0.40 .mu.m, a crystallite size of 110 to 180 .ANG., a specific surface area of 30 to 60 m.sup.2 /g, a coercive force of 1,300 to 1,700 Oe and a saturation magnetization (.sigma.s) of not less than 100 emu/g and a process for producing the same.
摘要翻译： 本文公开了含有选自Ni，Al，Si，P，Co，Mg，B和Zn中的至少一种的锭状磁铁基合金粒子，其粒径为0.05〜0.40μm，a 微晶尺寸为110〜180，比表面积为30〜60m2 / g，矫顽力为1300〜1700Oe，饱和磁化强度（sigma）为100emu / g以上， 相同。
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5.发明授权Process for producing plate-like magnetite particles and plate-like maghemite particles 失效板状磁铁矿颗粒和板状磁赤铁矿颗粒的生产方法
公开(公告)号：US4865834A
公开(公告)日：1989-09-12
申请号：US156508
申请日：1988-02-16
申请人： Mamoru Tanihara , Yoshiro Okuda , Hideaki Sadamura
发明人： Mamoru Tanihara , Yoshiro Okuda , Hideaki Sadamura
IPC分类号： G11B5/706
CPC分类号： G11B5/70689
摘要： Plate-like magnetite particles, plate-like maghemite particles and the processes for producing these particles are herein disclosed. The plate-like magnetite particles and the plate-like maghemite particles provided according to the present invention are fine plate-like particles which are poreless and non-sintered as the plate-like magnetite particles are produced directly from an aqueous solution and these plate-like magnetite particles are oxidized by heating to produce the plate-like maghemite particles. Therefore, these particles can be filled to a high density in a vehicle or resin, have good dispersibility and orientability and are also high in a degree of particle contact, so that they are suited for use as electromagnetic wave absorbing and shielding material, magnetic material for magnetic recording, black or brown pigment for paints and colorant for rubber and plastic products.
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6.发明授权Acicular magnetic iron based alloy particles for magnetic recording and method of producing the same 失效用于磁记录的针状磁铁基合金颗粒及其制备方法
公开(公告)号：US5238483A
公开(公告)日：1993-08-24
申请号：US921093
申请日：1992-07-29
申请人： Akio Mishima , Mamoru Tanihara , Yasutaka Ota , Hirofumi Kawasaki , Kenji Okinaka , Kunio Ikemoto , Kousaku Tamari , Kohji Mori , Norimichi Nagai
发明人： Akio Mishima , Mamoru Tanihara , Yasutaka Ota , Hirofumi Kawasaki , Kenji Okinaka , Kunio Ikemoto , Kousaku Tamari , Kohji Mori , Norimichi Nagai
IPC分类号： G11B5/706
CPC分类号： G11B5/70615
摘要： Disclosed herein are acicular magnetic iron based alloy particles for magnetic recording, containing 1.5 to 10 mol % of B based on Fe (calculated as B) and 1.5 to 10 mol % of Co based on Fe (calculated as Co) in the vicinity of the surfaces of said particles and having a saturation magnetization of not less than 125 emu/g and an S.F.D. value of not more than 0.50, and a process for producing the same.
摘要翻译： 本文公开了用于磁记录的针状磁性铁基合金颗粒，其含有1.5至10mol％的基于Fe的B（以B计）和1.5至10mol％的基于Fe（以Co计算）的Co在附近 所述颗粒的表面具有不小于125emu / g的饱和磁化强度和SFD 值不大于0.50，及其制造方法。
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7.发明授权Acicular magnetic iron based alloy particles for magnetic recording and method of producing the same 失效用于磁记录的基于磁性铁的合金颗粒及其制造方法
公开(公告)号：US5156922A
公开(公告)日：1992-10-20
申请号：US728328
申请日：1991-07-08
申请人： Akio Mishima , Mamoru Tanihara , Yasutaka Ota , Hirofumi Kawasaki , Kenji Okinaka , Kunio Ikemoto , Kousaku Tamari , Kohji Mori , Norimichi Nagai
发明人： Akio Mishima , Mamoru Tanihara , Yasutaka Ota , Hirofumi Kawasaki , Kenji Okinaka , Kunio Ikemoto , Kousaku Tamari , Kohji Mori , Norimichi Nagai
IPC分类号： G11B5/706
CPC分类号： G11B5/70615 , Y10T428/12181
摘要： Disclosed herein are acicular magnetic iron based alloy particles for magnetic recording, containing 1.5 to 10 mol % of B based on Fe (calculated as B) and 1.5 to 10 mol % of Co based on Fe (calculated as Co) in the vicinity of the surfaces of said particles and having a saturation magnetization of not less than 125 emu/g and an S.F.D. value of not more than 0.50, and a process for producing the same.
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8.发明授权Acicular magnetic metal particles containing iron as main ingredient and process for producing the same 失效含有铁的主要磁性金属颗粒作为主要成分及其生产方法
公开(公告)号：US5137783A
公开(公告)日：1992-08-11
申请号：US502553
申请日：1990-04-02
申请人： Mamoru Tanihara , Yasutaka Ota , Hiroshi Fukui , Takashi Ogawa , Tsuneo Suhara
发明人： Mamoru Tanihara , Yasutaka Ota , Hiroshi Fukui , Takashi Ogawa , Tsuneo Suhara
IPC分类号： G11B5/712
CPC分类号： G11B5/712 , Y10T428/2991 , Y10T428/2998
摘要： Disclosed herein are acicular magnetic metal particles containing iron as the main ingredient the surfaces of which are coated with a polymer formed from at least one of silicone compounds represented by the following formula (I):(R.sup.1 HSiO).sub.a (R.sup.2 R.sup.3 SiO).sub.b (R.sup.4 R.sup.5 R.sup.6 SiO.sub.1/2)c (I)wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 respectively represent a hydrogen atom or hydrocarbon group having 1 to 10 carbon atoms which hydrocarbon group may be substituted by at least one halogen atom, a and b are respectively 0 or integers of not less than 1, and c is 0 or 2, provided that when c is 0, the sum of a and b is an integer of not less than 3 and which have a coercive force of not less than 1400 Oe, a saturation magnetization of not less than 100 emu/g, a major axial diameter of not more than 0.25 .mu.m and an S.F.D. of not more than 0.38, and a process for producing the acicular magnetic metal particles containing iron as the main ingredient.
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