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.

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

IPC分类号： G11B5/706 ,  G11B5/714 ,  H01F1/06 ,  H01F1/11 ,  H01F1/36

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。

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

IPC分类号： G11B5/706 ,  G11B5/714 ,  H01F1/06

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。

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。

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.

公开(公告)号：US5645652A

公开(公告)日：1997-07-08

申请号：US433871

申请日：1995-05-01

申请人： Kenji Okinaka ,  Yasutaka Ota

发明人： Kenji Okinaka ,  Yasutaka Ota

IPC分类号： B22F1/00 ,  C01G49/06 ,  G11B5/706 ,  B22F9/26 ,  H01F1/20

CPC分类号： B82Y30/00 ,  B22F1/004 ,  C01G49/06 ,  G11B5/70621 ,  C01P2002/54 ,  C01P2002/60 ,  C01P2004/03 ,  C01P2004/10 ,  C01P2004/54 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2004/84 ,  C01P2006/42 ,  Y10T428/12097 ,  Y10T428/12181

摘要： The disclosure describes spindle-shaped magnetic iron-based alloy particles containing cobalt and iron as the main ingredients in which the Co content is 1.0 to 50.0 atm % (calculated as Co) based on the total Fe in the spindle-shaped magnetic iron-based alloy particles, and which the spindle-shaped magnetic iron-based alloy particles have an average major axis diameter of 0.05 to 0.18 .mu.m, a size distribution (standard deviation/major axis diameter) of not more than 0.25, an average minor axis diameter of 0.010 to 0.020 .mu.m, an aspect ratio (major axis diameter/minor axis diameter) of 4 to 15, an X-ray crystallite size D.sub.110 of 120 to 180 .ANG., a coercive force of 1720 to 2500 Oe, a saturation magnetization of not less than 110 emu/g, and a saturation magnetization decrement percentage of not more than 17%.

摘要翻译： 本发明描述了以钴和铁为主要成分的纺锤形磁性铁基合金颗粒作为主要成分，其中Co含量为1.0至50.0atm％（以Co计算），基于纺锤形磁性铁基中的总Fe 合金颗粒，并且纺锤形磁性铁基合金颗粒的平均长轴直径为0.05至0.18μm，尺寸分布（标准偏差/长轴直径）不大于0.25，平均短轴直径 为0.010〜0.020μm，长宽比（长轴径/短轴直径）为4〜15，X射线晶粒尺寸D110为120〜180，矫顽力为1720〜2500Oe，饱和磁化强度为 不小于110emu / g，饱和磁化强度减少百分比不大于17％。

公开(公告)号：US4851292A

公开(公告)日：1989-07-25

申请号：US8439

申请日：1987-01-29

申请人： Norimichi Nagai ,  Akihiko Hirayama ,  Norio Sugita ,  Masao Kiyama ,  Toshio Takada ,  Katsunori Fujimoto ,  Yasutaka Ota

发明人： Norimichi Nagai ,  Akihiko Hirayama ,  Norio Sugita ,  Masao Kiyama ,  Toshio Takada ,  Katsunori Fujimoto ,  Yasutaka Ota

IPC分类号： G11B5/706

CPC分类号： G11B5/70678 ,  Y10S428/90 ,  Y10T428/2982 ,  Y10T428/2991

摘要： Disclosed herein are plate-like barium ferrite particles with a solid solution of zinc on the surface thereof, which have an average particle diameter of not less than 0.03 .mu.m and less than 0.1 .mu.m, a BET specific surface are of 55 to 80 m.sup.2 /g, a coercive force of 300 to 1,500 Oe and a magnetization of not less than 57 emu/g, preferably not less than 60 emu/g, in magnetic field of 10 KOe, and which are represented by the following formula (I):BaO.n[(Fe.sub.1-x-y Co.sub.x Ti.sub.y).sub.2 O.sub.3-x+y ] (I)wherein x and y are independently from 0.02 to 0.12 and n is from 4 to 11, the atomic ratio of Co to Fe(III) being from 0.02:1 to 0.13:1 and the molar ratio of Ti to Co being from more than 0 to not more than 0.8, and a process for producing the plate-like barium ferrite particles.

公开(公告)号：US06753084B2

公开(公告)日：2004-06-22

申请号：US10022801

申请日：2001-12-20

申请人： Masaaki Maekawa ,  Haruki Kurokawa ,  Kenji Okinaka ,  Akinori Yamamoto ,  Yasutaka Ota

发明人： Masaaki Maekawa ,  Haruki Kurokawa ,  Kenji Okinaka ,  Akinori Yamamoto ,  Yasutaka Ota

IPC分类号： B32B516

CPC分类号： G11B5/70621 ,  Y10S428/90

摘要： Spindle-shaped magnetic alloy particles containing Fe and Co as main components of the present invention have a cobalt content of 20 to 50 atm % (calculated as Co) based on whole Fe; an average major axis diameter (L) of 0.03 to 0.10 &mgr;m; a coercive force value of 159.2 to 238.7 kA/m (2,000 to 3,000 Oe); a crystallite size of 100 to 160 Å; and an activation volume (Vact) of 0.01 to 0.07E-4 &mgr;m3. A high-density magnetic recording medium produced by using such spindle-shaped magnetic alloy particles containing Fe and Co as main components, have an excellent output characteristics in a short wavelength region, a considerably reduced noise and an excellent storage stability.

摘要翻译： 含有Fe和Co作为本发明主要成分的锭状磁性合金颗粒的钴含量基于Fe的总和为20〜50atm％（以Co计）。 平均长轴直径（L）为0.03〜0.10μm; 矫顽力值为159.2〜238.7kA / m（2,000〜3,000Oe）; 微晶尺寸为100至160埃; 和活性体积（Vact）为0.01〜0.07E-4mum 3。 通过使用含有Fe和Co作为主要成分的纺锤形磁性合金粒子制造的高密度磁记录介质，在短波长区域具有优异的输出特性，噪音明显降低，存储稳定性优异。

公开(公告)号：US5989516A

公开(公告)日：1999-11-23

申请号：US986630

申请日：1997-12-08

申请人： Kenji Okinaka ,  Yasutaka Ota

发明人： Kenji Okinaka ,  Yasutaka Ota

IPC分类号： B22F1/00 ,  C01G49/06 ,  G11B5/706 ,  C01G49/02

CPC分类号： B82Y30/00 ,  B22F1/004 ,  C01G49/06 ,  G11B5/70621 ,  C01P2002/54 ,  C01P2002/60 ,  C01P2004/03 ,  C01P2004/10 ,  C01P2004/54 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2004/84 ,  C01P2006/42

摘要： The present invention relates to a spindle-shaped goethite particles containing cobalt of 8.0 to 50.0 atm %, calculated as Co, based on the total Fe in the spindle-shaped goethite particles and a compound of at least one element selected from the group consisting of Al, Si, Nd, Y, La, Ce, Pr, Tb, Ca, Mg, Ba and Sr of not more than 25.0 atm %, calculated as the element, based on the total Fe in the spindle-shaped goethite particles, and having an average major axis diameter of 0.05 to 0.15 .mu.m, a size distribution (standard deviation/major axis diameter) of not more than 0.30, an average minor axis diameter of 0.010 to 0.025 .mu.m, an aspect ratio of 4 to 8 and an X-ray crystallite size ratio (D.sub.020 /D.sub.110) of 2.0 to 3.5. These spindle-shaped goethite particles are useful as raw material of spindle-shaped magnetic iron-based alloy particles containing cobalt and iron as the main ingredients, which have a uniform particle size, no inclusion of dendrites, a high coercive force, an excellent coercive force distribution, a large saturation magnetization, and in addition, an excellent stability against oxidation.

摘要翻译： 本发明涉及一种纺锤形针铁矿颗粒，其中钴为8.0〜50.0atm％，以Co计算，基于纺锤状针铁矿颗粒中的Fe总量和选自以下的至少一种元素的化合物： Al，Si，Nd，Y，La，Ce，Pr，Tb，Ca，Mg，Ba和Sr的含量以不超过25.0atm％计，作为元素，基于纺锤形针铁矿颗粒中的总Fe， 平均长轴直径为0.05〜0.15μm，尺寸分布（标准偏差/长轴直径）不大于0.30，平均短轴直径为0.010至0.025μm，纵横比为4至8和 X射线微晶尺寸比（D020 / D110）为2.0〜3.5。 这些纺锤状针铁矿颗粒可用作以钴和铁为主要成分的纺锤形磁性铁基合金颗粒的原料，它们具有均匀的粒度，不包括枝晶，高矫顽力，优良的矫顽力 力分布，饱和磁化强度大，另外还具有优异的抗氧化稳定性。

公开(公告)号：US06682813B2

公开(公告)日：2004-01-27

申请号：US10196131

申请日：2002-07-17

申请人： Kohji Mori ,  Yasutaka Ota

发明人： Kohji Mori ,  Yasutaka Ota

IPC分类号： G11B5712

CPC分类号： B22F1/0007 ,  B22F1/004 ,  G11B5/70621 ,  H01F1/061 ,  H01F1/442 ,  Y10T428/2982

摘要： Magnetic acicular alloy particles containing iron as a main component according to the present invention, have an average major axial diameter of 0.05 to 0.2 &mgr;m, and pH values of water suspensions of said magnetic acicular alloy particles containing iron as a main component, which satisfies the formula: (pH value of water suspension treated by A method)−(pH value of water suspension treated by B method)

摘要翻译： 以铁为主要成分的根据本发明的磁针状合金粒子的平均主轴径为0.05〜0.2μm，所述含有铁的磁性针状合金粒子的水悬浮液的pH值为 式中，以铁为主成分的磁性针状合金粒子在车辆中表现出优异的分散性，特别是由极性基团如-SO3M（其中M为H，Na或K）的粘合剂树脂， COOH等，并且其中涂膜中的取向和填充密度得到改善。