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：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：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：US5686012A

公开(公告)日：1997-11-11

申请号：US522723

申请日：1995-09-01

申请人： Kazuyuki Hayashi ,  Hiroko Morii ,  Mineko Sakoda ,  Minoru Ohsugi ,  Mamoru Kamigaki

发明人： Kazuyuki Hayashi ,  Hiroko Morii ,  Mineko Sakoda ,  Minoru Ohsugi ,  Mamoru Kamigaki

IPC分类号： C09C3/00 ,  C09C3/12 ,  C09D5/23 ,  C09D7/12 ,  G11B5/712 ,  G11B5/74 ,  H01F1/00

CPC分类号： B82Y30/00 ,  C09C3/006 ,  C09C3/12 ,  C09D7/1225 ,  C09D7/1275 ,  G11B5/712 ,  C01P2004/10 ,  C01P2004/20 ,  C01P2004/32 ,  C01P2004/38 ,  C01P2004/41 ,  C01P2004/42 ,  C01P2004/50 ,  C01P2004/54 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2004/80 ,  C01P2006/12 ,  C01P2006/60 ,  C01P2006/82 ,  C08K3/22 ,  C08K9/08 ,  Y10T428/2991 ,  Y10T428/2998

摘要： The disclosure describes modified particles comprising inorganic particles as core particles, and at least one polysiloxane modified with at least one selected from the group consisting of polyethers, polyesters and aralkyls, which is coated on the surfaces of said core particles.

摘要翻译： 本公开内容描述了包含无机颗粒作为核心颗粒的改性颗粒和至少一种被选自聚醚，聚酯和芳烷基中的至少一种的聚硅氧烷，其被涂覆在所述芯颗粒的表面上。

公开(公告)号：US5543069A

公开(公告)日：1996-08-06

申请号：US509607

申请日：1995-07-31

申请人： Kazuyuki Hayashi ,  Minoru Ohsugi ,  Hiroko Morii ,  Norio Sugita

发明人： Kazuyuki Hayashi ,  Minoru Ohsugi ,  Hiroko Morii ,  Norio Sugita

IPC分类号： B22F1/02 ,  C01G49/00 ,  G11B5/712 ,  H01F1/11 ,  C04B35/26

CPC分类号： G11B5/712 ,  Y10T428/2993

摘要： Disclosed herein magnetic particles for magnetic recording which comprise acicular or plate-like magnetic particles and not less than 0.01 wt % (calculated as Al, SiO.sub.2 or Al and SiO.sub.2 and based on the acicular or plate-like magnetic particles) of an oxide or hydroxide containing Al, Si or both Al and Si and adhered to the surfaces of the acicular or plate-like magnetic particles, and which have not less than 0.50 of a molecular-weight-dependent parameter .alpha. represented by the following formula (I):As=K.sub.1 .multidot.M.sup..alpha. (I)wherein M represents a number-average molecular weight of a binder, As represents a saturation adsorption of said binder, and K.sub.1 represents a constant dependent on the binder and a solvent used for measuring As.

摘要翻译： 本文公开了包含针状或板状磁性颗粒的磁性颗粒，并且不少于0.01重量％（以Al，SiO 2或Al和SiO 2计算，并且基于针状或板状磁性颗粒）氧化物或氢氧化物 含有Al，Si或Al和Si两者，并且粘附到针状或板状磁性颗粒的表面，并且具有不低于0.50的由下式（I）表示的分子量依赖性参数α：As =K1xMα（I）其中M表示粘合剂的数均分子量，As表示所述粘合剂的饱和吸附，K1表示取决于粘合剂和用于测量As的溶剂的常数。

公开(公告)号：US5484545A

公开(公告)日：1996-01-16

申请号：US149834

申请日：1993-11-10

申请人： Kazuyuki Hayashi ,  Minoru Ohsugi ,  Hiroko Morii ,  Norio Sugita

发明人： Kazuyuki Hayashi ,  Minoru Ohsugi ,  Hiroko Morii ,  Norio Sugita

IPC分类号： B22F1/02 ,  C01G49/00 ,  G11B5/712 ,  H01F1/11 ,  C04B35/26 ,  B32B18/00

CPC分类号： G11B5/712 ,  Y10T428/2993

摘要： Disclosed herein magnetic particles for magnetic recording which comprise acicular or plate-like magnetic particles and not less than 0.01 wt % (calculated as Al, SiO.sub.2 or Al and SiO.sub.2 and based on the acicular or plate-like magnetic particles) of an oxide or hydroxide containing Al, Si or both Al and Si and adhered to the surfaces of the acicular or plate-like magnetic particles, and which have not less than 0.50 of a molecular-weight-dependent parameter .alpha. represented by the following formula (I):As=K.sub.1 .multidot.M.sup..alpha. (I)wherein M represents a number-average molecular weight of a binder, As represents a saturation adsorption of said binder, and K.sub.1 represents a constant dependent on the binder and a solvent used for measuring As.

摘要翻译： 本文公开了包含针状或板状磁性颗粒的磁性颗粒，并且不少于0.01重量％（以Al，SiO 2或Al和SiO 2计算，并且基于针状或板状磁性颗粒）氧化物或氢氧化物 含有Al，Si或Al和Si两者，并且粘附到针状或板状磁性颗粒的表面，并且具有不低于0.50的由下式（I）表示的分子量依赖性参数α：As =K1xMα（I）其中M表示粘合剂的数均分子量，As表示所述粘合剂的饱和吸附，K1表示取决于粘合剂和用于测量As的溶剂的常数。

公开(公告)号：US06863966B1

公开(公告)日：2005-03-08

申请号：US09710834

申请日：2000-11-14

申请人： Kazuyuki Hayashi ,  Hiroko Morii ,  Mamoru Kamigaki ,  Yasuyuki Tanaka ,  Keisuke Iwasaki

发明人： Kazuyuki Hayashi ,  Hiroko Morii ,  Mamoru Kamigaki ,  Yasuyuki Tanaka ,  Keisuke Iwasaki

IPC分类号： G11B5/712 ,  G11B5/66 ,  B32B3/00 ,  B32B3/02 ,  B32B5/16 ,  B32B9/00

CPC分类号： G11B5/712 ,  Y10S428/90 ,  Y10S428/926 ,  Y10T428/257 ,  Y10T428/26 ,  Y10T428/2995

摘要： A magnetic recording medium comprises: a non-magnetic base film; and a magnetic recording layer comprising a binder resin and black magnetic acicular composite particles having an average particle diameter of 0.051 to 0.35 μm, comprising magnetic acicular cobalt-coated iron oxide particles or magnetic acicular metal particles containing iron as a main component, a coating formed on surface of the magnetic acicular particles, comprising at least one organosilicon compound selected from the group consisting of: (1) organosilane compounds obtainable from alkoxysilane compounds, and (2) polysiloxanes or modified polysiloxanes, and a carbon black coat formed on the coating layer comprising said organosilicon compound, in an amount of from more than 10 to 40 parts by weight based on 100 parts by weight of said magnetic acicular particles. Such a magnetic recording medium exhibits not only a smooth surface, a smaller light transmittance and a lower surface electrical resistivity value, but also a small friction coefficient and an excellent running durability.

摘要翻译： 磁记录介质包括：非磁性基膜; 以及包含粘结剂树脂和平均粒径为0.051-0.35μm的黑色磁性针状复合颗粒的磁性记录层，包括磁性针状钴包覆氧化铁颗粒或以铁为主要成分的磁性针状金属颗粒，在表面上形成的涂层 包含至少一种选自以下的有机硅化合物：（1）由烷氧基硅烷化合物得到的有机硅烷化合物和（2）聚硅氧烷或改性聚硅氧烷，以及在包含所述有机硅的涂层上形成的炭黑涂层 化合物，相对于100重量份的所述磁针状颗粒，其含量为10-40重量份以上。这样的磁记录介质不仅表现出光滑的表面，较小的透光率和较低的表面电阻率值 ，而且摩擦系数小，运行耐久性好。

公开(公告)号：US06767611B2

公开(公告)日：2004-07-27

申请号：US10152345

申请日：2002-05-22

申请人： Kazuyuki Hayashi ,  Hiroko Morii ,  Mamoru Kamigaki ,  Yasuyuki Tanaka ,  Keisuke Iwasaki

发明人： Kazuyuki Hayashi ,  Hiroko Morii ,  Mamoru Kamigaki ,  Yasuyuki Tanaka ,  Keisuke Iwasaki

IPC分类号： G11B5706

CPC分类号： G11B5/712 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/2991 ,  Y10T428/2993 ,  Y10T428/2995 ,  Y10T428/2996 ,  Y10T428/31663

摘要： A magnetic recording medium using black magnetic acicular composite particles produced by forming a single carbon black coat between the surface of magnetic acicular cobalt-coated iron oxide particle or magnetic acicular metal particle and a coating comprising at least one organosilicon compound, in an amount of from more than 10 to 40 parts by weight based on 100 parts by weight of the magnetic acicular particles, exhibits not only a smooth surface, a smaller light transmittance and a lower surface electrical resistivity value, but also a small friction coefficient and an excellent running durability.

公开(公告)号：US06350505B2

公开(公告)日：2002-02-26

申请号：US09758211

申请日：2001-01-12

申请人： Kazuyuki Hayashi ,  Keisuke Iwasaki ,  Yasuyuki Tanaka ,  Hiroko Morii

发明人： Kazuyuki Hayashi ,  Keisuke Iwasaki ,  Yasuyuki Tanaka ,  Hiroko Morii

IPC分类号： G11B5733

CPC分类号： B82Y30/00 ,  C01G49/06 ,  C01P2004/10 ,  C01P2004/54 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2004/84 ,  C01P2006/12 ,  C01P2006/22 ,  C01P2006/40 ,  C01P2006/42 ,  C01P2006/80 ,  G11B5/708 ,  G11B5/738 ,  Y10T428/24355 ,  Y10T428/257 ,  Y10T428/265 ,  Y10T428/2991

摘要： High-density acicular hematite particles comprise acicular hematite particles and a coat comprising an oxide of tin or oxides of tin and antimony, formed on at least a part of surfaces of said acicular hematite particles; and have an average major axial diameter of not more than 0.3 &mgr;m, a pH value of not less than 8, a soluble sodium salt content of not more than 300 ppm, calculated as Na, and a soluble sulfate content of not more than 150 ppm, calculated as SO4. Such high-density acicular hematite particles is suitable as non-magnetic particles for a non-magnetic undercoat layer of a magnetic recording medium using magnetic particles containing iron as a main ingredient, have an excellent dispersibility in vehicle and a low volume resistivity.

公开(公告)号：US6054201A

公开(公告)日：2000-04-25

申请号：US30962

申请日：1998-02-26

申请人： Kazuyuki Hayashi ,  Keisuke Iwasaki ,  Hiroko Morii ,  Yasuyuki Tanaka

发明人： Kazuyuki Hayashi ,  Keisuke Iwasaki ,  Hiroko Morii ,  Yasuyuki Tanaka

IPC分类号： G11B5/706 ,  G11B5/73 ,  G11B5/738

CPC分类号： G11B5/738 ,  G11B5/706 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/257

摘要： The present invention relates to a magnetic recording medium comprising: a non-magnetic substrate; a non-magnetic undercoat layer formed on said non-magnetic substrate, said undercoat layer comprising non-magnetic acicular hematite particles containing 0.05 to 50% by weight of aluminum uniformly within the particles, calculated as Al, based on the total weight of the non-magnetic particles and a binder resin,; and a magnetic recording layer formed on said non-magnetic undercoat layer, said magnetic recording layer comprising magnetic particles containing iron as a main ingredient and a binder resin. The magnetic recording medium has small light transmittance, smooth surface, high strength and high durability.

摘要翻译： 磁记录介质技术领域本发明涉及一种磁记录介质，包括：非磁性基板; 形成在所述非磁性基材上的非磁性底涂层，所述底涂层包含非磁性针状赤铁矿颗粒，所述非磁性针状赤铁矿颗粒含有0.05至50重量％的所述颗粒内均匀的铝，以Al计算，基于非磁性底涂层， 磁性颗粒和粘合剂树脂; 以及形成在所述非磁性底涂层上的磁记录层，所述磁记录层包含含铁作为主要成分的磁性颗粒和粘合剂树脂。 磁记录介质的透光率小，表面光滑，强度高，耐久性高。