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1. 发明申请

WO2004018365A1 IRON OXIDE POWDER FOR UNDERCOAT LAYER OF COAT-TYPE MAGNETIC RECORDING MEDIUM HAVING MULTILAYER STRUCTURE AND A PROCESS OF PRODUCING THE SAME 审中-公开
标题翻译：用于具有多层结构的涂层型磁记录介质的不饱和层的氧化铁粉及其制造方法
公开(公告)号：WO2004018365A1
公开(公告)日：2004-03-04
申请号：PCT/JP2003/002582
申请日：2003-03-05
申请人： KANTO DENKA KOGYO CO., LTD. , IIZUKA, Shinji , NAGATSUKA, Tamio , SAITO Takashi , MORIYA, Yosimi , HAYASHI, Masatomo
发明人： IIZUKA, Shinji , NAGATSUKA, Tamio , SAITO Takashi , MORIYA, Yosimi , HAYASHI, Masatomo
IPC分类号： C01G49/06
CPC分类号： B82Y30/00 , C01G49/06 , C01G49/08 , C01G51/00 , C01P2002/54 , C01P2004/54 , C01P2004/62 , C01P2004/64 , C01P2006/10 , C01P2006/12 , C01P2006/22 , C01P2006/42 , C01P2006/60 , G11B5/70673 , G11B5/738
摘要： Iron oxide powder for an undercoat layer of a coat-type magnetic recording medium having a multilayer structure which comprises cobalt-doped iron oxide particles having an average length of 0.02 to 0.3 µm, an aspect ratio (length to width ratio) of 2 to 13, and a BET specific surface area of 40 to 100 m 2 /g, containing a cobalt compound in an amount of 0.2 to 10 atom% in terms of cobalt based on total iron, and having a pH of 6 to 8, a soluble cation content of 50 ppm or less, and a soluble anion content of 50 ppm or less.
摘要翻译：用于具有多层结构的涂层型磁记录介质的底涂层的氧化铁粉末，其包含平均长度为0.02至0.3μm的钴掺杂的氧化铁颗粒，纵横比（长宽比）为2至13 ，BET比表面积为40〜100m 2 / g，含钴量为0.2〜10原子％，相对于总铁为钴，pH为6〜8，可溶性阳离子含量为50ppm以下，可溶性阴离子含量为50ppm以下。

2. 发明申请

WO9208165A3 TRANSPARENT MAGNETIC RECORDING LAYERS AND PHOTOGRAPHIC ELEMENTS CONTAINING THE SAME 审中-公开
标题翻译：透明磁记录层和含有它的摄影元素
公开(公告)号：WO9208165A3
公开(公告)日：1992-06-25
申请号：PCT/US9108050
申请日：1991-11-05
申请人： EASTMAN KODAK CO
发明人： JAMES ROBERT O , BERTUCCI SIDNEY JOSEPH , OLTEAN GEORGE LESLIE
IPC分类号： G03C5/14 , G11B5/633 , G11B5/706 , G11B5/712
CPC分类号： G11B5/70673 , G03C5/14 , G11B5/633
摘要： A photographic element including a light-sensitive layer and a transparent magnetic layer wherein the magnetic particles in the transparent binder are cobalt suface treated gamma iron oxide (Fe2O3) having a specific area of at least 30 m2/g, the particles being coated with from about 10 to about 50 % by weight of a material having a refractive index less than that of the binder, the particles having a powder coercivity greater than about 450 Oe.

3. 发明申请

WO2004008440A1 磁気記録媒体および磁気記録媒体の製造方法审中-公开
标题翻译：磁记录介质及其制造方法
公开(公告)号：WO2004008440A1
公开(公告)日：2004-01-22
申请号：PCT/JP2003/008907
申请日：2003-07-14
申请人：ソニー株式会社 , 佐藤諭
发明人：佐藤諭
IPC分类号： G11B5/78
CPC分类号： G11B5/7023 , G11B5/70 , G11B5/70621 , G11B5/70673 , G11B5/7305
摘要：　再生出力やノイズレベル、エラーレートともに良好な値が得られ、保存安定性についても優れた磁気記録媒体である。芳香族ポリイミドよりなる長尺状の基体（１）上に、コバルト含有マグヘマイト薄膜よりなる磁性層（３）が形成された構成を有し、基体（１）は膜厚３～１０μｍであり、磁性層（３）形成面の十点平均粗さ（ＳＲｚ）が５～３０ｎｍであり、磁性層（３）は、膜厚１０～５０ｎｍであり中心面平均粗さ（ＳＲａ）が０．１～３．０ｎｍであり、面内方向の保磁力が２０００～４０００Ｏｅ（１５８０００～３１６０００A/m）であるものとした磁気記録媒体（１０）を作製する。
摘要翻译：一种磁记录介质，确保良好的再现输出，噪声水平和误差率，并显示出优异的存储稳定性。磁记录介质（10）具有在芳香族聚酰亚胺的长基体（1）上形成含有钴的磁赤铁矿薄膜的磁性层（3）的结构，其中，基体（1）的膜厚为 3-10μm，在磁性层（3）形成表面上的10点平均粗糙度（SRz）为5-30nm，并且磁性层（3）的膜厚为10-50μm，中心表面平均粗糙度（SRa）为0.1-3.0nm，平面内方向的矫顽力为2000-4000Oe（158000-316000A / m）。

4. 发明申请

WO9208165A2 TRANSPARENT MAGNETIC RECORDING LAYERS AND PHOTOGRAPHIC ELEMENTS CONTAINING THE SAME 审中-公开
标题翻译：透明磁记录层和包含该层的摄影元件
公开(公告)号：WO9208165A2
公开(公告)日：1992-05-14
申请号：PCT/US9108050
申请日：1991-11-05
申请人： EASTMAN KODAK CO
发明人： JAMES ROBERT O , BERTUCCI SIDNEY JOSEPH , OLTEAN GEORGE LESLIE
IPC分类号： G03C5/14 , G11B5/633 , G11B5/706
CPC分类号： G11B5/70673 , G03C5/14 , G11B5/633
摘要： A photographic element including a light-sensitive layer and a transparent magnetic layer wherein the magnetic particles in the transparent binder are cobalt suface treated gamma iron oxide (Fe2O3) having a specific area of at least 30 m2/g, the particles being coated with from about 10 to about 50 % by weight of a material having a refractive index less than that of the binder, the particles having a powder coercivity greater than about 450 Oe.
摘要翻译：一种包括光敏层和透明磁性层的照相元件，透明粘合剂中的磁性颗粒是具有至少30m 2 / g的比表面积的钴表面处理的γ（Fe 2 O 3）所述颗粒涂覆有约10至约50重量％的折射率低于粘合剂的材料，所述颗粒具有大于约450Oe的粉末矫顽力。

5. 发明申请

WO1995002242A1 DOPED MAGNETIC IRON OXIDE PARTICLES AND METHOD OF PREPARING THE SAME 审中-公开
标题翻译：掺杂的磁性氧化物颗粒及其制备方法
公开(公告)号：WO1995002242A1
公开(公告)日：1995-01-19
申请号：PCT/US1994005537
申请日：1994-05-17
申请人： MINNESOTA MINING AND MANUFACTURING COMPANY
发明人： MINNESOTA MINING AND MANUFACTURING COMPANY , BLAGEV, Albena, V.
IPC分类号： G11B05/712
CPC分类号： G11B5/70673
摘要： A doped magnetic iron oxide particle suitable for use in magnetic recording media, and methods of preparing the doped magnetic iron oxide particle, are disclosed. The doped magnetic iron oxide particle has the general formula: CoxFe 1-xFe2 O4, wherein O
摘要翻译：公开了适用于磁记录介质的掺杂的磁性氧化铁颗粒以及制备掺杂的磁性氧化铁颗粒的方法。掺杂的磁性氧化铁颗粒具有以下通式：Co x Fe 2+ 1-x Fe 2 O 3，其中O

6. 发明申请

WO1990007775A1 MAGNETIC RECORDING MEDIUM HAVING BALANCED CHARACTERISTICS 审中-公开
标题翻译：具有平衡特性的磁记录介质
公开(公告)号：WO1990007775A1
公开(公告)日：1990-07-12
申请号：PCT/JP1990000012
申请日：1990-01-08
申请人： KONICA CORPORATION , NAKANO, Yasushi , TOBISAWA, Seiichi , KOYAMA, Noboru
发明人： KONICA CORPORATION
IPC分类号： G11B05/716
CPC分类号： G11B5/714 , G11B5/70673 , G11B5/708 , G11B5/716
摘要： A magnetic recording medium having a plurality of magnetic layers is disclosed. A first magnetic layer provided on a support member contains a Co-containing η-iron oxide magnetic material having a BET specific surface area of 25 to 40 m2/g and a coercive force (Hc) of 600 to 750 Oe, 0.05 to 0.3 % by weight of silicon with respect to the magnetic material, and 7 to 13 % by weight of carbon black with respect to the magnetic material. A second magnetic layer provided thereon contains a Co-containing η-iron oxide magnetic material having a BET specific surface area of 25 to 70m2/g and a coercive force (Hc) of 750 to 950 Oe, and less than 1 % by weight of carbon black with respect to the magnetic material. It is desired that the first magnetic layer contains phosphoric ester. Further, a binder for the magnetic material should preferably be a polyvinyl chloride containing electronegative functional groups. The magnetic recording medium produces large chroma output and RF output and exhibits well-balanced electromagnetic characteristics and running durability of the tape, so that it is suitably used as a recording material.

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