公开(公告)号：US5079092A

公开(公告)日：1992-01-07

申请号：US556697

申请日：1990-07-24

申请人： Masaaki Maekawa ,  Norimichi Nagai ,  Norio Sugita

发明人： Masaaki Maekawa ,  Norimichi Nagai ,  Norio Sugita

IPC分类号： G11B5/706

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

摘要： Disclosed herein are plate-like composite ferrite fine particles for magnetic recording comprising plate-like composite ferrite containing Ba fine particles which contain Ti of 2 to 5.0 atomic % based on Fe.sup.3+ and Ni in the range of 1.2.ltoreq.Ni/Ti.ltoreq.4 by molar ratio, which have zinc in the vicinity of the particles surfaces in the form of a solid solution, which have an average particle diameter of 0.01 .mu.m to 0.08 .mu.m, and the coercive force of which scarcely varies with the rise in temperature in the temperature range of -20.degree. C. to 120.degree. C., and a process for producing such plate-like composite ferrite fine particles.

公开(公告)号：US5604015A

公开(公告)日：1997-02-18

申请号：US240512

申请日：1994-05-10

申请人： Kazuyuki Hayashi ,  Keisuke Iwasaki ,  Yasuyuki Tanaka ,  Minoru Ohsugi ,  Hiroko Morii ,  Mineko Sakoda ,  Norio Sugita ,  Masaaki Maekawa

发明人： Kazuyuki Hayashi ,  Keisuke Iwasaki ,  Yasuyuki Tanaka ,  Minoru Ohsugi ,  Hiroko Morii ,  Mineko Sakoda ,  Norio Sugita ,  Masaaki Maekawa

IPC分类号： G11B5/733 ,  G11B5/738 ,  B32B33/00 ,  G11B5/66 ,  G11B5/70

CPC分类号： G11B5/738 ,  G11B5/733 ,  Y10S428/90 ,  Y10T428/24372 ,  Y10T428/2438 ,  Y10T428/24388 ,  Y10T428/265 ,  Y10T428/2991 ,  Y10T428/2993 ,  Y10T428/2995

摘要： The disclosure describes a non-magnetic undercoating layer for a magnetic recording medium, coated on the surface of a non-magnetic substrate comprising:non-magnetic particles selected from the group consisting of particles (1) and (2):(1) coated acicular or spindle-shaped .alpha.-Fe.sub.2 O.sub.3 particles which are produced by adhering not less than 0.01 to 20 wt % (calculated as Al, SiO.sub.2 or Al and SiO.sub.2, and based on acicular or spindle-shaped .alpha.-Fe.sub.2 O.sub.3 particles as a core material) of an oxide or a hydroxide containing Al, Si or both Al and Si to the surfaces of acicular or spindle-shaped .alpha.-Fe.sub.2 O.sub.3 particles as a core material, and have a molecular weight-dependent parameter .alpha. represented by the following formula of not less than 0.5:As=K.sub.1 .multidot.M.sup..alpha.wherein M represents the number-average molecular weight of a binder resin, As represents the saturation adsorption of said binder resin, and K.sub.1 represents a constant used for measuring As and dependent on the binder resin and a solvent,(2) BaO.4.5Fe.sub.2 O.sub.3 particles having an average particle diameter of not more than 0.1 .mu.m; anda binder resin.

摘要翻译： 本发明描述了一种涂覆在非磁性基材表面上的用于磁记录介质的非磁性底涂层，包括：选自颗粒（1）和（2）的非磁性颗粒：（1）涂覆 通过粘附不小于0.01至20重量％（以Al，SiO 2或Al和SiO 2计算，并以针状或纺锤形α-Fe2O3颗粒为核心材料）制备的针状或纺锤状α-Fe2O3颗粒， 含有Al，Si或Al和Si的氧化物或氢氧化物作为核心材料的针状或纺锤形α-Fe2O3颗粒的表面，并且具有不低于下列公式的分子量依赖参数α 比0.5：As =K1xMα其中M表示粘合剂树脂的数均分子量，As表示所述粘合剂树脂的饱和吸附，K1表示用于测量As的常数，并且取决于粘合剂树脂和溶剂， （ 2）平均粒径不大于0.1μm的BaO.4.5Fe2O3颗粒; 和粘合剂树脂。

公开(公告)号：US5830557A

公开(公告)日：1998-11-03

申请号：US392199

申请日：1995-02-22

申请人： Kazuyuki Hayashi ,  Keisuke Iwasaki ,  Yasuyuki Tanaka ,  Minoru Ohsugi ,  Hiroko Morii ,  Mineko Sakoda ,  Norio Sugita ,  Masaaki Maekawa

发明人： Kazuyuki Hayashi ,  Keisuke Iwasaki ,  Yasuyuki Tanaka ,  Minoru Ohsugi ,  Hiroko Morii ,  Mineko Sakoda ,  Norio Sugita ,  Masaaki Maekawa

IPC分类号： G11B5/733 ,  G11B5/738 ,  G11B5/66 ,  G11B5/70

CPC分类号： G11B5/738 ,  G11B5/733 ,  Y10S428/90 ,  Y10T428/24372 ,  Y10T428/2438 ,  Y10T428/24388 ,  Y10T428/265 ,  Y10T428/2991 ,  Y10T428/2993 ,  Y10T428/2995

摘要： The disclosure describes a non-magnetic undercoating layer for a magnetic recording medium, coated on the surface of a non-magnetic substrate comprising: non-magnetic particles selected from the group consisting of particles (1) and (2): (1) coated acicular or spindle-shaped .alpha.-Fe.sub.2 O.sub.3 particles which are produced by adhering not less than 0.01 to 20 wt % (calculated as Al, SiO.sub.2 or Al and SiO.sub.2, and based on acicular or spindle-shaped .alpha.-Fe.sub.2 O.sub.3 particles as a core material) of an oxide or a hydroxide containing Al, Si or both Al and Si to the surfaces of acicular or spindle-shaped .alpha.-Fe.sub.2 O.sub.3 particles as a core material, and have a molecular weight-dependent parameter .alpha. represented by the following formula of not less than 0.5: As=K.sub.1 .multidot.M.sup..alpha. wherein M represents the number-average molecular weight of a binder resin, As represents the saturation adsorption of said binder resin, and K.sub.1 represents a constant used for measuring As and dependent on the binder resin and a solvent, (2) BaO.multidot.4.5Fe.sub.2 O.sub.3 particles having an average particle diameter of not more than 0.1 .mu.m; and a binder resin.

摘要翻译： 本发明描述了一种涂覆在非磁性基材表面上的用于磁记录介质的非磁性底涂层，包括：选自颗粒（1）和（2）的非磁性颗粒：（1）涂覆 通过粘附不小于0.01至20重量％（以Al，SiO 2或Al和SiO 2计算，并以针状或纺锤形α-Fe2O3颗粒为核心材料）制备的针状或纺锤状α-Fe2O3颗粒， 含有Al，Si或Al和Si的氧化物或氢氧化物作为核心材料的针状或纺锤形α-Fe2O3颗粒的表面，并且具有不低于下列公式的分子量依赖参数α 比0.5：As =K1xMα其中M表示粘合剂树脂的数均分子量，As表示所述粘合剂树脂的饱和吸附，K1表示用于测量As的常数，并且取决于粘合剂树脂和溶剂， （ 2）平均粒径不大于0.1μm的BaO x 4.5 Fe 2 O 3粒子; 和粘合剂树脂。

公开(公告)号：US5118575A

公开(公告)日：1992-06-02

申请号：US566036

申请日：1990-08-13

申请人： Masaaki Maekawa ,  Norio Sugita

发明人： Masaaki Maekawa ,  Norio Sugita

IPC分类号： C01G49/00 ,  C09D5/23 ,  C09D7/12 ,  G11B5/706 ,  H01F1/11

CPC分类号： G11B5/70678 ,  Y10T428/2991

摘要： Disclosed herein are plate-like composite Ba-containing ferrite fine particles for magnetic recording, containing Ni, Co and Ti in the molar ratios defined by 0.02.ltoreq.Ni/Fe.ltoreq.0.10, 0.01.ltoreq.Co/Fe.ltoreq.0.10 and 0.01.ltoreq.Ti/Fe.ltoreq.0.10, but 0.03.ltoreq.(Ni+Co)/Fe.ltoreq.0.14 and Ti/(Ni+Co)

公开(公告)号：US5882795A

公开(公告)日：1999-03-16

申请号：US392259

申请日：1995-02-22

申请人： Kazuyuki Hayashi ,  Keisuke Iwasaki ,  Yasuyuki Tanaka ,  Minoru Ohsugi ,  Hiroko Morii ,  Mineko Sakoda ,  Norio Sugita ,  Masaaki Maekawa

发明人： Kazuyuki Hayashi ,  Keisuke Iwasaki ,  Yasuyuki Tanaka ,  Minoru Ohsugi ,  Hiroko Morii ,  Mineko Sakoda ,  Norio Sugita ,  Masaaki Maekawa

IPC分类号： G11B5/733 ,  G11B5/738 ,  B32B1/00

CPC分类号： G11B5/738 ,  G11B5/733 ,  Y10S428/90 ,  Y10T428/24372 ,  Y10T428/2438 ,  Y10T428/24388 ,  Y10T428/265 ,  Y10T428/2991 ,  Y10T428/2993 ,  Y10T428/2995

摘要： The disclosure describes a non-magnetic undercoating layer for a magnetic recording medium, coated on the surface of a non-magnetic substrate comprising:non-magnetic particles selected from the group consisting of particles (1) and (2):(1) coated acicular or spindle-shaped .alpha.-Fe.sub.2 O.sub.3 particles which are produced by adhering not less than 0.01 to 20 wt % (calculated as Al, SiO.sub.2 or Al and SiO.sub.2, and based on acicular or spindle-shaped .alpha.-Fe.sub.2 O.sub.3 particles as a core material) of an oxide or a hydroxide containing Al, Si or both Al and Si to the surfaces of acicular or spindle-shaped .alpha.-Fe.sub.2 O.sub.3 particles as a core material, and have a molecular weight-dependent parameter .alpha. represented by the following formula of not less than 0.5:As=K.sub.1 .multidot.M.sup..alpha. wherein M represents the number-average molecular weight of a binder resin, As represents the saturation adsorption of said binder resin, and K.sub.1 represents a constant used for measuring As and dependent on the binder resin and a solvent,(2) BaO.4.5Fe.sub.2 O.sub.3 particles having an average particle diameter of not more than 0.1 .mu.m; anda binder resin.

摘要翻译： 本发明描述了一种涂覆在非磁性基材表面上的用于磁记录介质的非磁性底涂层，包括：选自颗粒（1）和（2）的非磁性颗粒：（1）涂覆 通过粘附不小于0.01至20重量％（以Al，SiO 2或Al和SiO 2计算，并以针状或纺锤形α-Fe2O3颗粒为核心材料）制备的针状或纺锤状α-Fe2O3颗粒， 含有Al，Si或Al和Si的氧化物或氢氧化物作为核心材料的针状或纺锤形α-Fe2O3颗粒的表面，并且具有不低于下列公式的分子量依赖参数α 比0.5：As =K1xMα其中M表示粘合剂树脂的数均分子量，As表示所述粘合剂树脂的饱和吸附，K1表示用于测量As的常数，并且取决于粘合剂树脂和溶剂， （ 2）平均粒径不大于0.1μm的BaO.4.5Fe2O3颗粒; 和粘合剂树脂。

公开(公告)号：US06821618B2

公开(公告)日：2004-11-23

申请号：US10185728

申请日：2002-07-01

申请人： Jun Koujima ,  Teruaki Santoki ,  Kenichi Nakata ,  Takanori Doi ,  Masaaki Maekawa ,  Kousaku Tamari

发明人： Jun Koujima ,  Teruaki Santoki ,  Kenichi Nakata ,  Takanori Doi ,  Masaaki Maekawa ,  Kousaku Tamari

IPC分类号： C23C1408

CPC分类号： G11B5/653 ,  G11B5/851 ,  Y10T428/265

摘要： A magnetic recording medium exhibiting a high coercive force and excellent squareness having a substrate, an underlayer formed on the substrate, and a spinel-type iron oxide thin film with maghemite as a main component formed on the underlayer. The spinel-type iron oxide thin film has a thickness (t) of 5 to 50 nm, is constituted by grains having an average grain size (D) of 5 to 30 nm, standard deviation of sizes of grain of not more than 4 nm and a ratio (D/t) of the average grain size (D) to the thickness (t) of less than 1.0, exhibits a coercive force of not less than 159 kA/m (2,000 Oe) and a coercive squareness ratio S* of not less than 0.5:1 in a longitudinal recording medium or a squareness ratio not less than 0.75:1 in a perpendicular recording medium.

摘要翻译： 具有高矫顽力和具有基底的优良矩形性的磁记录介质，在基底上形成的底层和在底层上形成有以磁赤铁矿为主要成分的尖晶石型氧化铁薄膜。 尖晶石型氧化铁薄膜的厚度（t）为5〜50nm，由平均粒径（D）为5〜30nm的晶粒构成，粒径不超过4nm的标准偏差 平均粒径（D）与厚度（t）的比（D / t）小于1.0时，矫顽力为159kA / m 2（2000Oe），矫顽截面比S * 在纵向记录介质中不小于0.5:1，或垂直记录介质中不小于0.75:1的矩形比。

公开(公告)号：US06632771B1

公开(公告)日：2003-10-14

申请号：US09890121

申请日：2001-07-27

申请人： Masaaki Maekawa ,  Chisako Shirai ,  Satoshi Takeuchi ,  Zenichi Yamada

发明人： Masaaki Maekawa ,  Chisako Shirai ,  Satoshi Takeuchi ,  Zenichi Yamada

IPC分类号： B01J2108

CPC分类号： C02F1/30 ,  B01D53/8628 ,  B01D53/9413 ,  B01D2255/20707 ,  B01D2255/802 ,  B01J21/063 ,  B01J21/08 ,  B01J35/0006 ,  B01J35/002 ,  B01J35/004 ,  B01J35/10 ,  B01J35/1061 ,  B01J35/1066 ,  B01J37/0201 ,  B01J37/0203 ,  B01J37/0209 ,  C02F1/32 ,  C02F1/725 ,  C02F2101/308 ,  C02F2305/10 ,  Y02W10/37

摘要： The silica gel carrying a titanium oxide photocatalyst in a high concentration of the present invention is characterized in that the concentration of the titanium oxide contained in the pores near the surface of the silica gel is 7-70% by weight, said silica gel having an average pore diameter of 6-100 nm, provided that the concentration gradient is provided such that the amount of the titanium oxide contained in the pores near the surface of the silica gel is 1.5 times or more than the amount of the titanium oxide contained in the pores near the central part of the silica gel.

摘要翻译： 含有本发明高浓度氧化钛光催化剂的硅胶的特征在于，硅胶表面附近的孔中含有的氧化钛的浓度为7-70重量％，所述硅胶具有 平均孔径为6〜100nm，条件是提供浓度梯度，使得在硅胶表面附近的孔中所含的氧化钛的量为包含在硅胶中的氧化钛的量的1.5倍或更多 硅胶中心部分附近的孔。

公开(公告)号：US07172642B2

公开(公告)日：2007-02-06

申请号：US10305353

申请日：2002-11-27

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

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

IPC分类号： B22F1/00 ,  B22F9/20 ,  H01F1/16

CPC分类号： H01F1/0551 ,  G11B5/70621 ,  Y10T428/325

摘要： Magnetic metal particles containing iron as a main component, comprising cobalt in an amount of usually 20 to 50 atm %, calculated as Co, based on whole Fe, aluminum in an amount of usually 3 to 15 atm %, calculated as Al, based on whole Fe and a rare earth element in an amount of usually 3 to 20 atm %, calculated as rare earth element, based on whole Fe, and having an average major axis diameter of usually 0.02 to 0.065 μm, preferably from 0.02 to less than 0.05 μm, a coercive force of usually 159.2 to 222.9 kA/m (2,000 to 2,800 Oe), a soluble Na content of usually not more than 30 ppm, a soluble Ca content of usually not more than 100 ppm, and an oxidation stability Δσs of usually not more than 10%.

摘要翻译： 以铁为主要成分的磁性金属颗粒，其含量通常为20〜50atm％，以Co为基准，以Fe为基准，以Al计，通常为3〜15atm％ 整个Fe和稀土元素，通常为3〜20atm％，以稀土元素计，以Fe为基准，平均长轴直径通常为0.02〜0.065μm，优选为0.02〜0.05wt％ 妈妈，通常为159.2〜222.9kA / m（2,000〜2,800Oe）的矫顽力，通常不超过30ppm的可溶性Na含量，通常不大于100ppm的可溶性Ca含量，以及氧化稳定性Deltasigmas 通常不超过10％。

公开(公告)号：US06916530B2

公开(公告)日：2005-07-12

申请号：US10255075

申请日：2002-09-26

申请人： Jun Koujima ,  Teruaki Santoki ,  Masaaki Maekawa ,  Takanori Doi

发明人： Jun Koujima ,  Teruaki Santoki ,  Masaaki Maekawa ,  Takanori Doi

IPC分类号： G11B5/64 ,  G11B5/73 ,  G11B5/66 ,  G11B5/70 ,  H01J1/00

CPC分类号： G11B5/667 ,  G11B5/653 ,  G11B5/7325 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/265

摘要： A perpendicular magnetic recording medium, comprises a substrate; a soft-magnetic layer formed on the substrate; an NaCl-type oxide layer for orientation control formed on the soft-magnetic layer, having a thickness of from more than 0 to less than 10 nm; and a magnetic recording layer formed on the NaCl-type oxide layer for orientation control, comprising a maghemite thin film. Such a perpendicular magnetic recording medium is capable of showing excellent magnetic properties, a high recording resolution and improved surface properties.

摘要翻译： 垂直磁记录介质，包括基板; 形成在所述基板上的软磁性层; 用于定向控制的NaCl型氧化物层形成在软磁层上，其厚度大于0至小于10nm; 以及形成在用于取向控制的NaCl型氧化物层上的磁记录层，包括磁赤铁矿薄膜。 这样的垂直磁记录介质能够显示优异的磁性能，高记录分辨率和改进的表面性能。

公开(公告)号：US06309479B1

公开(公告)日：2001-10-30

申请号：US09260481

申请日：1999-03-02

申请人： Kenji Okinaka ,  Masaaki Maekawa

发明人： Kenji Okinaka ,  Masaaki Maekawa

IPC分类号： H01F1053

CPC分类号： B82Y30/00 ,  C01G49/06 ,  C01P2002/52 ,  C01P2002/60 ,  C01P2002/72 ,  C01P2004/04 ,  C01P2004/10 ,  C01P2004/54 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2006/12 ,  G11B5/70621

摘要： Spindle-shaped metal particles and a process for producing magnetic spindle-shaped metal particle containing iron as a main component, which contains cobalt of 8 to 45 atm % calculated as Co, aluminum of 5 to 20 atm %, calculated as Al, and a rare earth element of 1 to 15 atm %, calculated as rare earth element, wherein the particles have an average major axial diameter of 0.05 to 0.15 &mgr;m, an average minor axial diameter of 0.010 to 0.022 &mgr;m, an aspect ratio of 4:1 to 8:1, a particle size distribution of not more than 0.20, and an X-ray crystallite size D110 of 12.0 to 17.0 nm. The spindle-shaped metal particles have a high coercive force, an excellent particle coercive force distribution, a large saturation magnetization and an excellent oxidation stability, and are excellent in a squareness (Br/Bm) of the sheet due to a good dispersibility in a binder resin.

摘要翻译： 主轴形金属颗粒和以铁计为主要成分的磁性纺锤形金属颗粒的制造方法，其以Co计为8〜45atm％的钴，以Al计为5〜20atm％的铝， 稀土元素为1〜15atm％，以稀土元素计，其中平均主轴径为0.05〜0.15μm，平均小轴径为0.010〜0.022μm，纵横比为4:1〜 8：1，粒径分布不大于0.20，X射线晶粒尺寸D110为12.0〜17.0nm。 纺锤形金属颗粒具有高的矫顽力，优异的颗粒矫顽力分布，大的饱和磁化强度和优异的氧化稳定性，并且由于分散性良好，片材的矩形度（Br / Bm）优异 粘合剂树脂。