公开(公告)号：US07357997B2

公开(公告)日：2008-04-15

申请号：US10507915

申请日：2003-04-02

申请人： Kazuyuki Matsumoto ,  Kenichi Inoue ,  Ken Inoue

发明人： Kazuyuki Matsumoto ,  Kenichi Inoue ,  Ken Inoue

IPC分类号： G11B5/733 ,  B32B5/16

CPC分类号： G11B5/738 ,  Y10T428/2982

摘要： A powder for an underlayer of a coating-type magnetic recording medium comprises acicular iron oxide particles having an average major axis length in the range of 20-200 nm, has a specific surface area measured by the BET method of 30-100 m2/g and has a powder pH of not greater than 7. The underlayer powder preferably contains 0.1-5.0 wt. % of P and optionally contains an amount of R (where R represents one or more rare earth elements, defined as including Y) such that R/Fe expressed in atomic percentage (at. %) is 0.1-10 at. %. The iron oxide powder enhances the properties required of a powder for forming the underlayer of a multi-layer structure coating-type magnetic recording tape, most notably the surface smoothness and strength of the tape.

摘要翻译： 涂覆型磁记录介质的底层粉末包括平均长轴长度在20-200nm范围内的针状氧化铁颗粒，具有通过BET法测量的比表面积为30-100μm ^{2 / g，粉末pH不大于7.底层粉末优选含有0.1-5.0wt。 P的％，并且任选地含有一定量的R（其中R表示一种或多种稀土元素，定义为包括Y），使得以原子百分比（at。％）表示的R / Fe为0.1-10at。 ％。 氧化铁粉末增强了用于形成多层结构涂覆型磁记录带的底层的粉末所需的性能，最显着地是带的表面平滑度和强度。}

公开(公告)号：US20050158586A1

公开(公告)日：2005-07-21

申请号：US10507915

申请日：2003-04-02

申请人： Kazuyuki Matsumoto ,  Kenichi Inoue ,  Ken Inoue

发明人： Kazuyuki Matsumoto ,  Kenichi Inoue ,  Ken Inoue

IPC分类号： C01G49/06 ,  G11B5/738 ,  G11B5/68

CPC分类号： G11B5/738 ,  Y10T428/2982

摘要： A powder for an underlayer of a coating-type magnetic recording medium comprises acicular iron oxide particles having an average major axis length in the range of 20-200 nm, has a specific surface area measured by the BET method of 30-100 m2/g and has a powder pH of not greater than 7. The underlayer powder preferably contains 0.1-5.0 wt % of P and optionally contains an amount of R (where R represents one or more rare earth elements, defined as including Y) such that R/Fe expressed in atomic percentage (at. %) is 0.1-10 at. %. The iron oxide powder enhances the properties required of a powder for forming the underlayer of a multi-layer structure coating-type magnetic recording tape, most notably the surface smoothness and strength of the tape.

摘要翻译： 涂覆型磁记录介质的底层粉末包括平均长轴长度在20-200nm范围内的针状氧化铁颗粒，具有通过BET法测量的比表面积为30-100μm ^{2 / g，粉末pH不大于7.底层粉末优选含有0.1-5.0重量％的P，并且任选地含有一定量的R（其中R表示一种或多种稀土元素，定义为 包括Y），使得以原子百分比（at。％）表示的R / Fe为0.1-10at。 ％ 氧化铁粉末增强了用于形成多层结构涂覆型磁记录带的底层的粉末所需的性能，最显着地是带的表面平滑度和强度。}

公开(公告)号：US20050129945A1

公开(公告)日：2005-06-16

申请号：US10508033

申请日：2003-04-02

申请人： Kazuyuki Matsumoto ,  Kenichi Inoue ,  Ken Inoue

发明人： Kazuyuki Matsumoto ,  Kenichi Inoue ,  Ken Inoue

IPC分类号： C01G49/06 ,  G11B5/738 ,  B32B5/16 ,  C09C1/22

CPC分类号： G11B5/738 ,  Y10T428/2982

摘要： A powder for an underlayer of a coating-type magnetic recording medium, which powder comprises flat-acicular iron oxide particles having an average major axis length of 20-200 nm, a short axis cross-section taken perpendicularly to the long axis that has a long width and a short width, and a short axis cross-section ratio defined as the ratio of the long width to the short width that is greater than 1.3 and substantially uniform in the long axis direction, the powder having a specific surface area measured by the BET method of 30-100 m2/g. The underlayer powder preferably contains 0.1-5.0 wt % of P and, optionally, an amount of R(R representing one or more rare earth elements, defined as including Y) such that R/Fe expressed in atomic percentage (at. %) is 0.1-10 at. %.

摘要翻译： 一种用于涂层型磁记录介质底层的粉末，该粉末包含平均长轴长度为20-200nm的扁平针状氧化铁颗粒，垂直于长轴的短轴截面为 长宽度和短宽度，短轴截面比定义为长宽与短宽的比大于1.3并且在长轴方向上基本均匀，所述粉末的比表面积由 BET法为30-100m 2 / g。 底层粉末优选含有0.1-5.0重量％的P和任选的R（R表示一个或多个稀土元素，定义为包括Y）的量，使得以原子百分比（at。％）表示的R / Fe为 0.1-10 at。 ％。

公开(公告)号：US07238438B2

公开(公告)日：2007-07-03

申请号：US10508033

申请日：2003-04-02

申请人： Kazuyuki Matsumoto ,  Kenichi Inoue ,  Ken Inoue

发明人： Kazuyuki Matsumoto ,  Kenichi Inoue ,  Ken Inoue

IPC分类号： G11B5/733 ,  B32B5/16

CPC分类号： G11B5/738 ,  Y10T428/2982

摘要： A powder for an underlayer of a coating-type magnetic recording medium, which powder comprises flat-acicular iron oxide particles having an average major axis length of 20–200 nm, a short axis cross-section taken perpendicularly to the long axis that has a long width and a short width, and a short axis cross-section ratio defined as the ratio of the long width to the short width that is greater than 1.3 and substantially uniform in the long axis direction, the powder having a specific surface area measured by the BET method of 30–100 m2/g. The underlayer powder preferably contains 0.1–5.0 wt % of P and, optionally, an amount of R(R representing one or more rare earth elements, defined as including Y) such that R/Fe expressed in atomic percentage (at. %) is 0.1–10 at. %.

摘要翻译： 一种用于涂层型磁记录介质底层的粉末，该粉末包含平均长轴长度为20-200nm的扁平针状氧化铁颗粒，垂直于长轴的短轴截面为 长宽度和短宽度，短轴截面比定义为长宽与短宽的比大于1.3并且在长轴方向上基本均匀，所述粉末的比表面积由 BET法为30-100m 2 / g。 底层粉末优选含有0.1-5.0重量％的P和任选的R（R表示一个或多个稀土元素，定义为包括Y）的量，使得以原子百分比（at。％）表示的R / Fe为 0.1-10 at。 ％。

公开(公告)号：US07166172B2

公开(公告)日：2007-01-23

申请号：US11002669

申请日：2004-12-03

申请人： Kazuyuki Matsumoto ,  Kimitaka Sato ,  Takatoshi Fujino ,  Kenichi Inoue

发明人： Kazuyuki Matsumoto ,  Kimitaka Sato ,  Takatoshi Fujino ,  Kenichi Inoue

IPC分类号： H01F1/03

CPC分类号： G11B5/70621 ,  G11B5/70615 ,  Y10S428/90 ,  Y10T428/2991

摘要： A ferromagnetic iron alloy powder for a magnetic recording medium is composed of acicular iron-base particles of an average major axis length (X) of not less than 20 nm and not greater than 80 nm and have oxygen content of not less than 15 wt % and coercive force (Hc) of not less than [0.0036 X3−1.1 X2+110 X−1390 (Oe)] (where X is average major axis length expressed in nm). The ferromagnetic iron alloy powder is obtained by reacting metal powder composed of acicular iron-base particles having an average major axis length of not less than 20 nm and not greater than 80 nm with pure water in substantial absence of oxygen to form a metal oxide film on the particle surfaces. Optionally, the particles can be reacted with a weak oxidizing gas by a wet or dry method.

摘要翻译： 用于磁记录介质的铁磁性铁合金粉末由平均长轴长（X）不小于20nm且不大于80nm的针状铁基颗粒组成，氧含量不小于15重量％ 和矫顽力（Hc）不小于[0.0036×3 -1.1×2 +1×10 -1390（Oe）]（其中X是表示的平均长轴长度 nm）。 通过使基本上不含氧的平均长轴长度不小于20nm且不大于80nm的针状铁基颗粒组成的金属粉末与纯水反应形成金属氧化物膜而获得铁磁性铁合金粉末 在颗粒表面。 任选地，颗粒可以通过湿法或干法与弱氧化气体反应。

公开(公告)号：US07074281B2

公开(公告)日：2006-07-11

申请号：US10378933

申请日：2003-03-05

申请人： Kazuyuki Matsumoto ,  Kimitaka Sato ,  Takatoshi Fujino ,  Kenichi Inoue

发明人： Kazuyuki Matsumoto ,  Kimitaka Sato ,  Takatoshi Fujino ,  Kenichi Inoue

IPC分类号： H01F1/04

CPC分类号： G11B5/70621 ,  Y10S428/90 ,  Y10T428/2991

摘要： A magnetic powder for magnetic recording is provided that has improved properties suitable for a magnetic recording medium used with a high-sensitivity read head utilizing an MR device. The magnetic powder is composed of iron-base acicular particles containing Co, Al, R (rare earth elements, including Y) and oxygen within the ranges of Co/Fe=10–50 at. %, dissolved Al/(Fe+Co)=5–50 at. %, R/(Fe+Co)=2–25 at. % and oxygen=not greater than 25 wt %; and the acicular particles have an average major axis length of 25–80 nm and a saturated magnetization σs of 10–130 emu/g,

公开(公告)号：US20050150574A1

公开(公告)日：2005-07-14

申请号：US11002669

申请日：2004-12-03

申请人： Kazuyuki Matsumoto ,  Kimitaka Sato ,  Takatoshi Fujino ,  Kenichi Inoue

发明人： Kazuyuki Matsumoto ,  Kimitaka Sato ,  Takatoshi Fujino ,  Kenichi Inoue

IPC分类号： G11B5/706 ,  G11B5/712 ,  G11B5/842 ,  H01F1/20

CPC分类号： G11B5/70621 ,  G11B5/70615 ,  Y10S428/90 ,  Y10T428/2991

摘要： A ferromagnetic iron alloy powder for a magnetic recording medium is composed of acicular iron-base particles of an average major axis length (X) of not less than 20 nm and not greater than 80 nm and have oxygen content of not less than 15 wt % and coercive force (Hc) of not less than [0.0036 X3−1.1 X2+110 X−1390 (Oe)] (where X is average major axis length expressed in nm). The ferromagnetic iron alloy powder is obtained by reacting metal powder composed of acicular iron-base particles having an average major axis length of not less than 20 nm and not greater than 80 nm with pure water in substantial absence of oxygen to form a metal oxide film on the particle surfaces. Optionally, the particles can be reacted with a weak oxidizing gas by a wet or dry method.

摘要翻译： 用于磁记录介质的铁磁性铁合金粉末由平均长轴长（X）不小于20nm且不大于80nm的针状铁基颗粒组成，氧含量不小于15重量％ 和矫顽力（Hc）不小于[0.0036×3 -1.1×2 +1×10 -1390（Oe）]（其中X是表示的平均长轴长度 nm）。 通过使基本上不含氧的平均长轴长度不小于20nm且不大于80nm的针状铁基颗粒组成的金属粉末与纯水反应形成金属氧化物膜而获得铁磁性铁合金粉末 在颗粒表面。 任选地，颗粒可以通过湿法或干法与弱氧化气体反应。

公开(公告)号：US06841271B2

公开(公告)日：2005-01-11

申请号：US10378861

申请日：2003-03-05

申请人： Kazuyuki Matsumoto ,  Kimitaka Sato ,  Takatoshi Fujino ,  Kenichi Inoue

发明人： Kazuyuki Matsumoto ,  Kimitaka Sato ,  Takatoshi Fujino ,  Kenichi Inoue

IPC分类号： G11B5/706 ,  G11B5/712 ,  G11B5/842 ,  G11B5/66

CPC分类号： G11B5/70621 ,  G11B5/70615 ,  Y10S428/90 ,  Y10T428/2991

摘要： A ferromagnetic iron alloy powder for a magnetic recording medium is composed of acicular iron-base particles of an average major axis length (X) of not less than 20 nm and not greater than 80 nm and have oxygen content of not less than 15 wt % and coercive force (Hc) of not less than [0.0036 X3−1.1 X2+110 X−1390 (Oe)] (where X is average major axis length expressed in nm). The ferromagnetic iron alloy powder is obtained by reacting metal powder composed of acicular iron-base particles having an average major axis length of not less than 20 nm and not greater than 80 nm with pure water in substantial absence of oxygen to form a metal oxide film on the particle surfaces. Optionally, the particles can be reacted with a weak oxidizing gas by a wet or dry method.

摘要翻译： 用于磁记录介质的铁磁性铁合金粉末由平均长轴长（X）不小于20nm且不大于80nm的针状铁基颗粒组成，氧含量不小于15重量％ 矫顽力（Hc）不小于[0.0036×3 -1.1×2 + 1×10 -1390（Oe）]（其中X为以nm表示的平均长轴长度）。 通过使基本上不含氧的平均长轴长度不小于20nm且不大于80nm的针状铁基颗粒组成的金属粉末与纯水反应形成金属氧化物膜而获得铁磁性铁合金粉末 在颗粒表面。 任选地，颗粒可以通过湿法或干法与弱氧化气体反应。

公开(公告)号：US20060234081A1

公开(公告)日：2006-10-19

申请号：US11375255

申请日：2006-03-15

申请人： Ken Inoue ,  Kenichi Inoue

发明人： Ken Inoue ,  Kenichi Inoue

IPC分类号： B32B15/04 ,  B32B19/00 ,  B32B9/00

CPC分类号： C23C14/0623 ,  C23C14/027 ,  C23C14/3464 ,  C23C14/352 ,  Y10T428/12576 ,  Y10T428/12806 ,  Y10T428/24975 ,  Y10T428/265

摘要： It is an object of the present invention to provide a multi-layer coating having excellent adhesion and sliding properties, which contains a hard layer having a main component of a nitride and/or carbonitride containing one or more elements selected from the group consisting of Ti, V, Zr, Cr, Nb, Si, Al and B and a lubricating layer consisting of a metal element and molybdenum disulfide on the hard layer wherein the lubricating layer has a graded composition in which the metal element has a decreasing content from the hard layer side towards the surface and the molybdenum disulfide has an increasing content, and wherein the lubricating layer has a maximum oxygen concentration of no greater than 25 atom %.

公开(公告)号：US20060040141A1

公开(公告)日：2006-02-23

申请号：US11206862

申请日：2005-08-19

申请人： Shinichi Konno ,  Kenichi Inoue ,  Toshihiko Ueyama ,  Ken Inoue

发明人： Shinichi Konno ,  Kenichi Inoue ,  Toshihiko Ueyama ,  Ken Inoue

IPC分类号： G11B5/716

CPC分类号： C09C1/24 ,  C01G49/06 ,  C01P2002/52 ,  C01P2006/12 ,  C01P2006/14 ,  C01P2006/16 ,  C01P2006/17 ,  C01P2006/22 ,  C01P2006/42 ,  G11B5/738 ,  Y10T428/257 ,  Y10T428/2982

摘要： A nonmagnetic powder, used for the nonmagnetic layer of a coated type magnetic recording medium having a multilayer structure, has good dispersibility in the binder in which it is dispersed to prepare a coating material that is applied to the nonmagnetic layer. The nonmagnetic powder has an iron compound as its principal component and exhibits a maximum pore volume value in a pore diameter range of 0.01 μm to 0.05 μm within a pore diameter range of 0.0018 μm to 0.1 μm in which the relationship between pore diameter and pore volume is calculated by a mercury injection method. The nonmagnetic powder exhibits a cumulative pore volume value in a pore diameter range of 0.0018 μm to 0.01 μm that is not more than 30% of the cumulative pore volume value in the pore diameter range of 0.0018 μm to 0.1 μm.

摘要翻译： 用于具有多层结构的涂覆型磁记录介质的非磁性层的非磁性粉末在其分散的粘合剂中具有良好的分散性，从而制备施加到非磁性层上的涂层材料。 非磁性粉末以铁化合物为主要成分，在孔径范围为0.0018〜0.1μm的孔径范围内，孔径范围为0.01μm〜0.05μm，孔径与孔体积的关系为最大孔体积值 通过汞注入法计算。 非磁性粉末的孔径范围为0.0018〜0.01μm的累积孔体积值为0.0018μm〜0.1μm的孔径范围的累积孔体积值的30％以下。