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1.发明授权Black magnetic acicular composite particles for magnetic recording medium and magnetic recording medium using the same 失效用于磁记录介质的黑色磁性针状复合颗粒和使用其的磁记录介质公开(公告)号：US06863966B1
公开(公告)日：2005-03-08
申请号：US09710834
申请日：2000-11-14
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。
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2.发明授权Non-magnetic undercoating layer for magnetic recording medium, magnetic recording medium and non-magnetic particles 失效用于磁记录介质的非磁性底涂层，磁记录介质和非磁性颗粒
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
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。
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3.发明授权公开(公告)号：US06767611B2
公开(公告)日：2004-07-27
申请号：US10152345
申请日：2002-05-22
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.
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4.发明授权公开(公告)号：US06350505B2
公开(公告)日：2002-02-26
申请号：US09758211
申请日：2001-01-12
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.
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公开(公告)号：US6054201A
公开(公告)日：2000-04-25
申请号：US30962
申请日：1998-02-26
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。
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6.发明授权Non-magnetic coated particles having a defined parameter .alpha. of not less than 0.5 失效具有不小于0.5的限定参数α的非磁性涂覆颗粒
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
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。
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7.发明授权Black plate-shaped ferrite composite particles with magnet oplumbite structure and magnetic recording medium using the same 失效黑色板状铁氧体复合颗粒与磁铁石英结构和磁记录介质使用相同公开(公告)号：US06531211B1
公开(公告)日：2003-03-11
申请号：US09577939
申请日：2000-05-25
IPC分类号： G11B5706
CPC分类号： G11B5/712 , Y10T428/25 , Y10T428/2982 , Y10T428/2991 , Y10T428/2993 , Y10T428/2995 , Y10T428/2998
摘要： Black plate-shaped ferrite composite particles with magnetoplumbite structure, particle size of 0.01 to 0.2 &mgr;m are surface coated with an organosilicon compound(s) and a carbon black coating is applied over the organosilicon coating layer. Optionally, a coating of silicon or aluminum oxide or hydroxide is provided on the surface of the black plate-shaped composite particles and below the organosilicon layer. The particles have a high blackness and when applied to a non-magnetic substrate with a binder resin to form a magnetic medium provide low light transmittance, low surface resistivity and a smooth surface.
摘要翻译： 具有磁铅矿结构的黑色板状铁素体复合颗粒，粒径为0.01至0.2μm的表面涂覆有机硅化合物，并在有机硅涂层上施加炭黑涂层。 任选地，在黑色板状复合颗粒的表面上和有机硅层下面提供硅或氧化铝或氢氧化物的涂层。 颗粒具有高的黑度，并且当用粘合剂树脂施加到非磁性基材以形成磁性介质时，提供低的透光率，低的表面电阻率和光滑的表面。
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8.发明授权Titanium oxide particles, substrate for magnetic recording medium and magnetic recording medium using the same 有权氧化钛粒子，磁记录介质用基板及使用其的磁记录介质公开(公告)号：US06458452B1
公开(公告)日：2002-10-01
申请号：US09465936
申请日：1999-12-17
IPC分类号： G11B5733
CPC分类号： G11B5/738 , C01G23/047 , C01P2004/62 , C01P2006/12 , C01P2006/80 , C09C1/3661 , Y10S428/90 , Y10T428/25 , Y10T428/256 , Y10T428/257 , Y10T428/265 , Y10T428/2982 , Y10T428/2991
摘要： The present invention relates to titanium oxide particles having an average particle size of not more than 0.3 &mgr;m, and a BET specific surface area of 15 to 200 m2/g, containing a soluble sodium salt of not more than 230 ppm, calculated as Na, and a soluble sulfate of not more than 150 ppm, calculated as SO4, and having a pH value of not less than 8. The titanium oxide particles of the present invention are suitable as non-magnetic particles for a non-magnetic undercoat layer of a magnetic recording medium which uses magnetic particles containing iron as a main ingredient, and even more particularly, are suitable as non-magnetic particles for a non-magnetic undercoat layer of a magnetic recording medium which uses magnetic particles containing iron as a main ingredient, show an excellent dispersibility in a binder resin, contain only a small amount of soluble sodium salt and soluble sulfate, and have a pH value of not less than 8.
摘要翻译： 本发明涉及平均粒径不大于0.3μm，BET比表面积为15-200m2 / g的氧化钛颗粒，其含有以Na计算的不大于230ppm的可溶性钠盐， 和不超过150ppm的可溶性硫酸盐，以SO 4计算，pH值不小于8.本发明的氧化钛颗粒适合作为非磁性颗粒用于非磁性底涂层 使用以铁为主成分的磁性粒子的磁记录介质，更具体地说，适合作为使用以铁为主要成分的磁性粒子的磁记录介质的非磁性底涂层的非磁性粒子， 在粘合剂树脂中具有优异的分散性，仅含有少量的可溶性钠盐和可溶性硫酸盐，并且具有不小于8的pH值。
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公开(公告)号：US06294242B1
公开(公告)日：2001-09-25
申请号：US09557631
申请日：2000-04-21
IPC分类号： G11B5706
CPC分类号： B82Y30/00 , C01P2004/03 , C01P2004/10 , C01P2004/50 , C01P2004/54 , C01P2004/62 , C01P2004/64 , C01P2004/80 , C01P2004/82 , C01P2004/84 , C01P2006/12 , C01P2006/40 , C01P2006/42 , C01P2006/60 , C01P2006/62 , C01P2006/80 , C09C3/006 , C09C3/12 , G11B5/712 , Y10S428/90 , Y10T428/256 , Y10T428/257 , Y10T428/2991 , Y10T428/2993 , Y10T428/2995 , Y10T428/31663
摘要： A magnetic recording medium of the present invention 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 0.72 &mgr;m, comprising: magnetic acicular core particles; a coating formed on surface of said magnetic acicular core particles, comprising at least one organosilicon compound selected from the group consisting of: (1) organosilane compounds obtainable from alkoxysilane compounds, (2) polysiloxanes or modified polysiloxanes, and (3) fluoroalkyl organosilane compounds obtainable from fluoroalkylsilane compounds; and a carbon black coat formed on said coating layer comprising said organosilicon compound, in an amount of 0.5 to 10 parts by weight based on 100 parts by weight of said magnetic acicular particles. Such a magnetic recording medium capable of not only showing a low light transmittance and a low surface resistivity even when the amount of carbon black fine particles added to a magnetic recording layer thereof is as small as possible, but also having a smooth surface.
摘要翻译： 本发明的磁记录介质包括：非磁性基膜; 以及包含粘结剂树脂和平均粒径为0.051〜0.72μm的黑色磁性针状复合粒子的磁记录层，其特征在于，包括：针状核心粒子; 包含至少一种有机硅化合物，所述有机硅化合物选自：（1）由烷氧基硅烷化合物得到的有机硅烷化合物，（2）聚硅氧烷或改性聚硅氧烷，和（3）氟代烷基有机硅烷化合物 可从氟代烷基硅烷化合物获得; 以及基于100重量份的所述磁性针状颗粒，在包含所述有机硅化合物的所述涂层上形成的炭黑涂层，其量为0.5至10重量份。这样的磁记录介质不仅可以显示低光 即使当添加到其磁记录层中的炭黑细颗粒的量尽可能小时，也具有平滑的表面时，透光率和低的表面电阻率。
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10.发明授权Magnetic recording medium containing non-magnetic hematite particles as an undercoat layer 有权含有非磁性赤铁矿颗粒作为底涂层的磁记录介质公开(公告)号：US06248437B1
公开(公告)日：2001-06-19
申请号：US09577334
申请日：2000-05-23
IPC分类号： B32B516
CPC分类号： B82Y30/00 , C01G49/06 , C01P2002/52 , C01P2004/10 , C01P2004/54 , C01P2004/62 , C01P2004/64 , C01P2006/12 , C01P2006/22 , C01P2006/42 , G11B5/738 , Y10S428/90 , Y10T428/256 , Y10T428/257 , Y10T428/2982 , Y10T428/2991
摘要： The present invention relates to acicular hematite particles containing aluminum of 0.05 to 50% by weight, calculated as Al, having an average major axial diameter of not more than 0.3 &mgr;m and a pH value of the particles of not less than 8, and containing soluble sodium salts of not more than 300 ppm soluble sodium, calculated as Na, and soluble sulfates of not more than 150 ppm soluble sulfate, calculated as SO4, which have an excellent dispersibility in a binder resin, and a magnetic recording medium which uses the hematite particles as non-magnetic particles for a non-magnetic undercoat layer, which has small light transmittance, smooth surface, high strength and high durability, and which is capable of suppressing the deterioration in the magnetic properties caused by a corrosion of the magnetic particles containing as a main ingredient in the magnetic recording layer.
摘要翻译： 本发明涉及铝的0.05〜50重量％的针状赤铁矿颗粒，Al计算，平均主轴径不大于0.3μm，颗粒的pH值不小于8，并含有可溶性 以Na计算的不超过300ppm的可溶性钠的钠盐和在粘合剂树脂中具有优异分散性的以SO 4计算的不超过150ppm可溶性硫酸盐的可溶性硫酸盐和使用赤铁矿的磁记录介质 颗粒作为非磁性底涂层的非磁性颗粒，其具有小的透光率，光滑的表面，高强度和高耐久性，并且能够抑制由含有 作为磁记录层中的主要成分。
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