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1. 发明授权

US06352776B1 Magnetic recording medium, non-magnetic acicular black iron-based composite particles and process for producing the particles 有权
标题翻译：磁记录介质，非磁性针状黑铁基复合颗粒及其制备方法
公开(公告)号：US06352776B1
公开(公告)日：2002-03-05
申请号：US09632096
申请日：2000-08-02
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 , C01P2004/03 , C01P2004/04 , C01P2004/10 , C01P2004/20 , C01P2004/32 , C01P2004/38 , C01P2004/50 , C01P2004/51 , C01P2004/54 , C01P2004/62 , C01P2004/64 , C01P2004/80 , C01P2004/82 , C01P2004/84 , C01P2004/86 , C01P2006/12 , C01P2006/19 , C01P2006/22 , C01P2006/40 , C01P2006/42 , C01P2006/60 , C01P2006/62 , C01P2006/80 , C01P2006/90 , C09C1/24 , C09C3/006 , C09C3/12 , G11B5/738 , Y10S428/90 , Y10T428/2991 , Y10T428/2993 , Y10T428/2995 , Y10T428/2998
摘要： A magnetic recording medium of the present invention comprises: a non-magnetic base film; a non-magnetic undercoat layer formed on the non-magnetic base film, comprising a binder resin and non-magnetic acicular black iron-based composite particles; and a magnetic coating film comprising a binder resin and magnetic particles, the non-magnetic acicular black iron-based composite particles comprising: acicular hematite particles or acicular iron oxide hydroxide particles (core particles) having an average major axis diameter of 0.01 to 0.3 &mgr;m; a coating layer formed on the surface of the particles, comprising a specific organosilicon compound; and a carbon black coat composed of at least two carbon black layers integrally formed on the coating layer, adhered with each other through an adhesive on the coating layer.
摘要翻译：本发明的磁记录介质包括：非磁性基膜;在非磁性基膜上形成的非磁性底涂层，包含粘合剂树脂和非磁性针状黑铁基复合颗粒; 和包含粘合剂树脂和磁性颗粒的磁性涂膜，所述非磁性针状黑色铁基复合颗粒包括：平均长径为0.01至0.3μm的针状赤铁矿颗粒或针状铁氧化物氢氧化物颗粒（核心颗粒）; 形成在颗粒表面上的涂层，其包含特定的有机硅化合物; 以及由涂覆层一体形成的至少两个碳黑层构成的炭黑涂层，通过涂层上的粘合剂彼此粘合。

2. 发明授权

US06468628B2 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US06468628B2
公开(公告)日：2002-10-22
申请号：US09759332
申请日：2001-01-16
申请人： Masanori Sueoka , Akimitsu Tsukuda , Nobuaki Ito
发明人： Masanori Sueoka , Akimitsu Tsukuda , Nobuaki Ito
IPC分类号： G11B5733
CPC分类号： G11B5/7315 , G11B5/64 , G11B5/70 , G11B5/7325 , G11B5/733 , G11B5/735 , Y10T428/24355 , Y10T428/24975 , Y10T428/31725
摘要： Disclosed is a magnetic recording medium having a magnetic layer directly formed on at least one surface of a base film that comprises, as the essential ingredient, an aromatic polyamide, in which the number of protrusions having a height of at least 10 nm on the surface of the magnetic layer, Na(10) (/mm2), the number of protrusions having a height of at least 50 nm thereon, Na(50) (/mm2), and the number of protrusions having a height of at least 10 nm on the surface of the base film coated with the magnetic layer, Na(10)′ (/mm2), all satisfy the following formulae: 2×104≦Na(10)≦2×107, 0≦Na(50)≦5×104, −0.9≦(Na(10)−Na(10)′)/Na(10)′≦0. The medium has, as the non-magnetic substrate (base film), a highly-tough, aromatic polyamide film, and the surface profile of its magnetic layer and that of its base film are specifically controlled.
摘要翻译：公开了一种磁记录介质，其具有直接形成在基膜的至少一个表面上的磁性层，所述磁性层包含作为必要成分的芳族聚酰胺，其中表面上具有至少10nm的高度的突起的数量的磁性层的Na（10）（/ mm 2），其上具有至少50nm的高度的突起的数量为Na（50）（/ mm 2），并且具有至少10nm的高度的突起的数量在涂覆有磁性层的基膜的表面上，Na（10）'（/ mm2）都满足下列公式：介质作为非磁性基材（基膜）具有高韧性，芳香性聚酰胺薄膜及其磁性层的表面轮廓及其底膜的表面轮廓是特别受控制的。

3. 发明授权

US06350505B2 High-density acicular hematite particles, non-magnetic undercoat layer and magnetic recording medium 有权
公开(公告)号：US06350505B2
公开(公告)日：2002-02-26
申请号：US09758211
申请日：2001-01-12
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.

4. 发明授权

US06627293B1 Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US06627293B1
公开(公告)日：2003-09-30
申请号：US09663091
申请日：2000-09-15
申请人： Makoto Inoue , Akiko Watanabe
发明人： Makoto Inoue , Akiko Watanabe
IPC分类号： G11B5733
CPC分类号： G11B5/738 , Y10T428/24355 , Y10T428/25 , Y10T428/257 , Y10T428/265
摘要： The present invention provides a magnetic recording medium comprising a non-magnetic support body coated with a lower undercoat layer formed from a non-magnetic paint prepared by kneading at least a binder and a non-magnetic powder and an upper magnetic layer formed on the lower undercoat layer, from a magnetic paint prepared by kneading at least a binder and a magnetic powder, wherein the non-magnetic powder includes a non-magnetic pigment whose surface has an area coated with graphite-shaped crystal of carbon black. The lower undercoat layer arranged under the magnetic layer has a preferable surface characteristic and an excellent electric conductivity, and the magnetic layer formed as a thin film has a preferable electromagnetic conversion characteristic.
摘要翻译：本发明提供一种磁记录介质，其包括涂覆有由通过捏合至少粘合剂和非磁性粉末而制备的非磁性涂料形成的下底涂层和形成在下层上的上磁性层的非磁性支撑体从通过捏合至少粘合剂和磁性粉末制备的磁性涂料得到的非涂料层，其中非磁性粉末包括其表面具有涂覆有炭黑的石墨状晶体的面积的非磁性颜料。布置在磁性层下方的下底涂层具有优选的表面特性和优异的导电性，并且形成为薄膜的磁性层具有优选的电磁转换特性。

5. 发明授权

US06458452B1 Titanium oxide particles, substrate for magnetic recording medium and magnetic recording medium using the same 有权
标题翻译：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
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： 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。

6. 发明授权

US06444290B1 Magnetic recording medium comprising a support containing a specific size filler and having a specific concentration of surface protrusions 失效
标题翻译：磁记录介质包括含有特定尺寸填料并具有特定浓度的表面突起的载体
公开(公告)号：US06444290B1
公开(公告)日：2002-09-03
申请号：US09329150
申请日：1999-06-09
申请人： Masatoshi Takahashi , Hitoshi Noguchi , Junichi Nakamikawa
发明人： Masatoshi Takahashi , Hitoshi Noguchi , Junichi Nakamikawa
IPC分类号： G11B5733
CPC分类号： G11B5/7085 , G11B5/70678 , Y10T428/24355 , Y10T428/24372 , Y10T428/25 , Y10T428/26 , Y10T428/2982
摘要： A magnetic recording medium is described, which comprises a support having thereon a substantially nonmagnetic lower layer and a magnetic layer comprising a ferromagnetic metal powder or a ferromagnetic hexagonal ferrite powder dispersed in a binder provided on the lower layer, which is a magnetic recording medium for recording signals of from 0.17 to 2 G bit/inch2 of areal recording density, wherein the dry thickness of the magnetic layer is from 0.05 to 0.30 &mgr;m , &phgr;m is from 10.0×10−3 to 1.0×10−3 emu/cm2, the coercive force of the magnetic layer is 1,800 Oe or more, and a filler having an average particle size of from 0.05 to 0.3 &mgr;m is present on the surface layer of the support in an amount of from 5,000,000 to 30,000,000/mm2.
摘要翻译：描述了一种磁记录介质，其包括其上具有基本上非磁性的下层的支撑体和包含分散在下层中的粘合剂中的铁磁性金属粉末或铁磁性六角铁氧体粉末的磁性层，所述粘合剂是用于记录信号为0.17至2G比特/英寸2的面积记录密度，其中磁性层的干厚度为0.05至0.30μm，phim为10.0×10 -3至1.0×10 -3 emu / cm 2，矫顽力的磁性层为1800Oe以上，平均粒径为0.05〜0.3μm的填料以5,000,000〜30,000,000 / mm2的量存在于载体的表层上。

7. 发明授权

US06284361B1 Magnetic recording medium and process for producing the same 失效
标题翻译：磁记录介质及其制造方法
公开(公告)号：US06284361B1
公开(公告)日：2001-09-04
申请号：US09181082
申请日：1998-10-27
申请人： Hideyuki Kobayashi , Kazutaka Yamashita , Masayasu Sato
发明人： Hideyuki Kobayashi , Kazutaka Yamashita , Masayasu Sato
IPC分类号： G11B5733
CPC分类号： G11B5/8404 , G11B5/733 , G11B5/738 , Y10S428/90 , Y10T428/25 , Y10T428/256 , Y10T428/257 , Y10T428/265
摘要： A magnetic recording medium comprising a substrate having provided thereon at least one intermediate layer essentially containing nonmagnetic powder and a binder and further having thereon a magnetic layer as an upper layer which essentially contains ferromagnetic powder and a binder, wherein the nonmagnetic powder in the intermediate layer is mainly acicular, and the acicular nonmagnetic powder has a coefficient of orientation (&agr;) of 0 to 0.8 in the longitudinal direction in the surface thereof.
摘要翻译：一种磁记录介质，包括其上设置有至少一个基本上包含非磁性粉末和粘合剂的中间层的基底，并且还具有基本上包含铁磁粉末和粘合剂的作为上层的磁性层，其中中间层中的非磁性粉末主要是针状，针状非磁性粉末的表面的长度方向的取向系数（α）为0〜0.8。

8. 发明授权

US06592966B1 Biaxially orientated multi layer polyester film 失效
标题翻译：双轴取向多层聚酯薄膜
公开(公告)号：US06592966B1
公开(公告)日：2003-07-15
申请号：US09979173
申请日：2001-11-20
申请人： Ieyasu Kobayashi , Toshifumi Osawa
发明人： Ieyasu Kobayashi , Toshifumi Osawa
IPC分类号： G11B5733
CPC分类号： B32B27/36 , B32B27/08 , B32B27/302 , B32B27/308 , B32B2305/72 , B32B2307/208 , B32B2325/00 , B32B2367/00 , B32B2429/00 , G11B5/733 , Y10T428/24355 , Y10T428/24942 , Y10T428/24975 , Y10T428/254 , Y10T428/256 , Y10T428/259 , Y10T428/31786
摘要： A biaxially oriented laminated polyester film which is excellent in film winding properties and handling properties and provides excellent electromagnetic conversion characteristics when it is used as a base film for high-density magnetic recording media, particularly digital recording magnetic recording media. This film consists of a polyester A layer and a polyester B layer formed on one side of the polyester A layer and is characterized in that: (1) the polyester A layer contains three different types of fine particles which differ from one another in average particle diameter and has a surface roughness WRa of 5 to 20 nm and a WRz of 100 to 300 nm, (2) the polyester B layer has a surface roughness WRa of 2 to 10 nm and a WRz of 30 to 150 nm, and (3) the film has a friction coefficient of 0.5 or less.
摘要翻译：一种双轴取向叠层聚酯薄膜，其在卷绕性能和处理性方面优异，并且当用作高密度磁记录介质的基膜，特别是数字记录磁记录介质时，具有优异的电磁转换特性。该薄膜由在聚酯A层一侧形成的聚酯A层和聚酯B层构成，其特征在于：（1）聚酯A层含有三种不同类型的平均粒子彼此不同的微粒表面粗糙度WRa为5〜20nm，WRz为100〜300nm，（2）聚酯B层的表面粗糙度WRa为2〜10nm，WRz为30〜150nm，（3 ）的摩擦系数为0.5以下。

9. 发明授权

US06479131B1 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US06479131B1
公开(公告)日：2002-11-12
申请号：US09596345
申请日：2000-06-19
申请人： Kiyomi Ejiri , Koji Naoe , Masahiko Mori
发明人： Kiyomi Ejiri , Koji Naoe , Masahiko Mori
IPC分类号： G11B5733
CPC分类号： G11B5/738 , Y10T428/24355 , Y10T428/2495 , Y10T428/25 , Y10T428/265 , Y10T428/2982
摘要： Disclosed is a magnetic recording medium exhibiting a high C/N ratio in high-density magnetic recording. The magnetic recording medium has, on a flexible nonmagnetic support, at least a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder on the nonmagnetic layer, where the magnetic layer has an average thickness d in the range of from 0.01 to 0.3 &mgr;m, said nonmagnetic powder has an acicular shape, and the ratio of a mean length L of the major axis of the nonmagnetic powder to an average thickness D of said nonmagnetic layer satisfies the relationship of 1/10≦L/D≦2.
摘要翻译：公开了在高密度磁记录中表现出高C / N比的磁记录介质。磁性记录介质在柔性非磁性载体上至少包含非磁性粉末和粘合剂的非磁性层和在非磁性层上含有铁磁粉末和粘合剂的磁性层，其中磁性层的平均厚度d在 0.01〜0.3μm的范围，所述非磁性粉末具有针状，非磁性粉末的长轴的平均长度L与所述非磁性层的平均厚度D的比例满足1/10 < = L / D <= 2。

10. 发明授权

US06468627B2 Polyester film for magnetic recording medium, and magnetic recording tape 有权
标题翻译：用于磁记录介质的聚酯膜和磁记录带
公开(公告)号：US06468627B2
公开(公告)日：2002-10-22
申请号：US09739012
申请日：2000-12-19
申请人： Masaaki Ono , Katsuya Okamoto , Toshihiro Tsuzuki , Tsutomu Morimoto
发明人： Masaaki Ono , Katsuya Okamoto , Toshihiro Tsuzuki , Tsutomu Morimoto
IPC分类号： G11B5733
CPC分类号： B32B27/36 , B32B15/09 , B32B27/00 , B32B27/08 , B32B27/18 , B32B37/153 , B32B2038/0028 , B32B2305/30 , B32B2307/208 , B32B2367/00 , B32B2429/00 , G11B5/7305 , G11B5/733 , Y10T428/24355 , Y10T428/25 , Y10T428/31786
摘要： Disclosed is a base film that has excellent electromagnetic conversion property over the entire length from a roll core portion to a surface portion of the film product and that is suitable for the production of digital videotapes with reduced dropouts. A polyester film for a magnetic recording medium includes at least a polyester layer A and a polyester layer B laminated. A center-line surface average roughness (SRa value) of a layer A-side surface of the film is 2 nm to 4 nm, and a ten-point average surface roughness (SRz value) of the layer A-side surface is 10 nm to 40 nm. The layer B contains a fine particle &agr; whose average particle size is at least 50 nm and less than 250 nm, and a fine particle &bgr; whose average particle size is at least 250 nm and less than 500 nm. The content of the fine particle &agr; in the layer B is 0.1 wt. % to 1.0 wt. %. The content of the fine particle &bgr; in the layer B is 0.01 wt. % to 0.10 wt. %. A magnetic recording tape is formed by providing a ferromagnetic metal thin film on a layer A-side surface of the polyester film.
摘要翻译：公开了一种基膜，其从卷芯部分到膜产品的表面部分的整个长度上具有优异的电磁转换特性，并且适用于生产具有降低的脱落的数字录像带。用于磁记录介质的聚酯膜至少包括聚酯层A和聚酯层B。膜的A面侧的中心线表面平均粗糙度（SRa值）为2nm〜4nm，层A侧表面的十点平均表面粗糙度（SRz值）为10nm 至40nm。层B含有平均粒径为50nm以上且小于250nm的细颗粒α，平均粒径为250nm以上且小于500nm的微粒β。层B中的细颗粒α的含量为0.1重量％。％〜1.0wt ％。层B中的细颗粒β的含量为0.01重量％。％至0.10wt ％。通过在聚酯膜的层A侧表面上设置强磁性金属薄膜来形成磁记录带。

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