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1. 发明授权

US07432000B2 Magnetic recording medium utilizing a back coat layer containing a carboxylic acid amine salt and a phosphate amine salt 有权
标题翻译：使用含有羧酸胺盐和磷酸胺盐的背涂层的磁记录介质
公开(公告)号：US07432000B2
公开(公告)日：2008-10-07
申请号：US11612755
申请日：2006-12-19
申请人： Takayoshi Kuwajima , Katsuhiko Yamazaki
发明人： Takayoshi Kuwajima , Katsuhiko Yamazaki
IPC分类号： G11B5/716
CPC分类号： G11B5/735 , G11B5/738
摘要： The present invention provides a magnetic recording medium which has a back coat layer excellent in surface smoothness and durability and is excellent in electromagnetic conversion property. A magnetic recording medium, comprising at least a non-magnetic support, a lower non-magnetic layer on one surface of the non-magnetic support, an upper magnetic layer on the lower non-magnetic layer, and a back coat layer on the other surface of the non-magnetic support, wherein the lower non-magnetic layer contains at least carbon black, a non-magnetic inorganic powder other than carbon black, and a binder resin material, the upper magnetic layer contains at least a ferromagnetic powder, and a binder resin material, and the back coat layer contains at least carbon black, a non-magnetic inorganic powder other than carbon black, a carboxylic acid amine salt, a phosphate amine salt, and a binder resin material.
摘要翻译：本发明提供一种磁性记录介质，其具有表面平滑性和耐久性优异且电磁转换特性优异的背涂层。一种磁记录介质，其至少包括非磁性载体，在非磁性载体的一个表面上的下部非磁性层，在下部非磁性层上的上部磁性层，以及在另一个上的背涂层所述非磁性载体的表面，其中所述下部非磁性层至少含有炭黑，除了炭黑以外的非磁性无机粉末和粘合剂树脂材料，所述上部磁性层至少含有铁磁性粉末，粘合剂树脂材料，背涂层至少含有炭黑，除炭黑以外的非磁性无机粉末，羧酸胺盐，磷酸胺盐和粘合剂树脂材料。

2. 发明申请

US20070026264A1 MAGNETIC RECORDING MEDIUM 审中-公开
标题翻译：磁记录介质
公开(公告)号：US20070026264A1
公开(公告)日：2007-02-01
申请号：US11461051
申请日：2006-07-31
申请人： Takayoshi Kuwajima , Akinori Nishizawa , Akihiko Seki
发明人： Takayoshi Kuwajima , Akinori Nishizawa , Akihiko Seki
IPC分类号： G11B5/716 , G11B5/71
CPC分类号： G11B5/70 , G11B5/73 , G11B5/735
摘要： A magnetic recording medium has a non-magnetic layer and a magnetic layer formed in that order on one surface of a non-magnetic support and a back coat layer formed on the other surface of the non-magnetic support. The non-magnetic layer is formed so as to include at least one of α-iron oxide and α-iron hydroxide. The magnetic layer is formed so as to include a ferromagnetic alloy powder. The back coat layer is formed so as to include carbon black, and barium sulfate. At least one of the non-magnetic layer and the magnetic layer includes lubricant. The layers are formed so that the amount of SO42− eluted when the magnetic recording medium is immersed in water at 70° C. is in a range of 300 ppm to 600 ppm inclusive relative to the weight of the magnetic recording medium.
摘要翻译：磁记录介质具有非磁性层和在非磁性载体的一个表面上形成的磁性层和形成在非磁性载体的另一个表面上的背涂层。非磁性层形成为包括α-氧化铁和α-氢氧化铁中的至少一种。磁性层形成为包含铁磁性合金粉末。背涂层形成为包括炭黑和硫酸钡。非磁性层和磁性层中的至少一个包括润滑剂。这些层被形成为使得当磁记录介质浸入70℃的水中时洗脱的SO 3 - 2的量在300ppm至相对于磁记录介质的重量为600ppm。

3. 发明授权

US5792548A Magnetic recording medium having a magnetic layer and an intermediate layer of specified composition 失效
标题翻译：具有磁性层和具有特定组成的中间层的磁记录介质
公开(公告)号：US5792548A
公开(公告)日：1998-08-11
申请号：US610094
申请日：1996-02-29
申请人： Takayoshi Kuwajima , Tsunehiko Ikarashi , Yuko Motegi
发明人： Takayoshi Kuwajima , Tsunehiko Ikarashi , Yuko Motegi
IPC分类号： G11B5/66 , C09C1/48 , C09D5/23 , C09D7/12 , G11B5/70 , G11B5/738 , G11B5/704
CPC分类号： G11B5/70 , G11B5/738 , Y10S428/90 , Y10T428/24967 , Y10T428/25 , Y10T428/256 , Y10T428/257 , Y10T428/265
摘要： A magnetic recording medium having an intermediate layer excellent in conductivity, surface properties and strength, and excellent in electromagnetic characteristics, physical properties, etc., which comprises a non-magnetic intermediate layer having a thickness of 0.5 .mu.m to 3.0 .mu.m formed on at least one surface of a non-magnetic support, and a magnetic layer formed on the intermediate layer, the magnetic layer being mainly composed of a ferromagnetic powder and a binder and having a thickness of 0.1 .mu.m to 0.5 .mu.m, in which said magnetic layer is formed on the intermediate layer at least in a dry state, and the intermediate layer comprises (A) an inorganic material having an average particle size of 10 nm to 50 nm and a Mohs' hardness of 7 or less, (B) an inorganic material having an average particle size of 100 nm to 500 nm and a Mohs' hardness of 9 or more, (C) carbon black, a lubricant and a binder.
摘要翻译：一种具有导电性，表面性质和强度优异，电磁特性，物理性能优异的中间层的磁记录介质，其包含厚度为0.5μm至3.0μm的非磁性中间层，其形成于非磁性载体的至少一个表面和形成在中间层上的磁性层，磁性层主要由铁磁粉末和粘合剂组成，厚度为0.1μm至0.5μm，其中所述至少在干燥状态下在中间层上形成磁性层，中间层包含（A）平均粒度为10nm〜50nm，莫氏硬度为7以下的无机材料，（B）平均粒径为100nm〜500nm，莫氏硬度为9以上的无机材料，（C）炭黑，润滑剂和粘合剂。

4. 发明授权

US07157163B2 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US07157163B2
公开(公告)日：2007-01-02
申请号：US10823564
申请日：2004-04-14
申请人： Naoto Yajima , Takayoshi Kuwajima , Akihiko Seki , Hiroyuki Yamada , Kenichi Kitamura
发明人： Naoto Yajima , Takayoshi Kuwajima , Akihiko Seki , Hiroyuki Yamada , Kenichi Kitamura
IPC分类号： G11B5/716 , G11B5/78
CPC分类号： G11B5/70 , G11B5/00813 , G11B5/714 , G11B5/738 , G11B5/78 , G11B2005/001 , Y10T428/12993
摘要： The present invention provides a magnetic recording medium comprising a magnetic layer with excellent surface smoothness, which comprises a thin film magnetic layer of thickness in a range from 0.03 to 0.30 μm that is ideal for short wavelength recording, and displays superior electromagnetic conversion characteristics. The magnetic recording medium comprises a magnetic layer containing at least a ferromagnetic powder and a binder resin on one surface of a non-magnetic support, wherein the thickness of the magnetic layer is within a range from 0.03 to 0.30 μm, and the number of concavities with a depth of 30 nm or greater in the surface of the magnetic layer is 5 per 1 cm2 of surface area or less. Preferably, the value of the average depth Rv6 of the surface of the magnetic layer, as measured by a contact type surface roughness meter, is 12 nm or less.
摘要翻译：本发明提供一种包括具有优异表面平滑度的磁性层的磁记录介质，其包括厚度在0.03至0.30μm范围内的薄膜磁性层，这对于短波长记录是理想的，并且显示出优异的电磁转换特性。磁记录介质包括在非磁性载体的一个表面上至少含有铁磁粉末和粘合剂树脂的磁性层，其中磁性层的厚度在0.03至0.30μm的范围内，并且凹部的数量磁性层表面的深度为30nm以上的表面积为1cm 2以下。优选地，通过接触型表面粗糙度计测量的磁性层的表面的平均深度Rv6的值为12nm以下。

5. 发明授权

US07090936B2 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US07090936B2
公开(公告)日：2006-08-15
申请号：US10397845
申请日：2003-03-27
申请人： Kenichi Kitamura , Takayoshi Kuwajima , Sadafumi Iijima
发明人： Kenichi Kitamura , Takayoshi Kuwajima , Sadafumi Iijima
IPC分类号： G11B5/738
CPC分类号： G11B5/738 , G11B5/7026
摘要： The present invention provides a high recording density magnetic recording medium with excellent surface smoothness, as well as excellent electromagnetic conversion characteristics and durability. A magnetic recording medium comprising a lower non-magnetic layer containing at least a non-magnetic powder and a binder resin on a non-magnetic support, and an upper magnetic layer with a thickness of 0.2 μm or less on said lower non-magnetic layer, wherein said lower non-magnetic layer contains an acicular powder of hydrated iron oxide as the non-magnetic powder, and said lower non-magnetic layer contains a fatty acid and a fatty acid amide. Preferably the acicular powder of hydrated iron oxide is goethite with an average long axial length of 0.15 μm or less.
摘要翻译：本发明提供了具有优异的表面光滑度以及优异的电磁转换特性和耐久性的高记录密度磁记录介质。一种磁记录介质，包括在非磁性载体上至少包含非磁性粉末和粘合剂树脂的下部非磁性层，以及在所述下部非磁性层上具有0.2μm或更小的厚度的上部磁性层其中所述下部非磁性层含有作为非磁性粉末的水合氧化铁的针状粉末，所述下部非磁性层含有脂肪酸和脂肪酸酰胺。优选地，水合氧化铁的针状粉末是具有0.15μm或更小的平均长轴向长度的针铁矿。

6. 发明授权

US06852404B2 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US06852404B2
公开(公告)日：2005-02-08
申请号：US10397519
申请日：2003-03-27
申请人： Takayoshi Kuwajima , Osamu Inoue , Akimasa Kaizu
发明人： Takayoshi Kuwajima , Osamu Inoue , Akimasa Kaizu
IPC分类号： G11B5/70 , G11B5/706 , G11B5/714
CPC分类号： G11B5/70621 , G11B5/70 , G11B5/714 , G11B5/738 , Y10T428/256 , Y10T428/265
摘要： The average major-axis length (L) of a ferromagnetic alloy powder primarily contained together with a binder in a magnetic layer provided on at least one surface of a non-magnetic support is less than 0.10 μm, and the ferromagnetic alloy powder contains Co at a content of 15 to 28 at % relative to Fe, and furthermore, contains Y at a content of 22 μmol/m2 or more with respect to a specific surface area (Sc) calculated from the above-mentioned average major-axis length (L) and the crystallite diameter (d). A coating-type high-recording-density magnetic recording medium has excellent surface properties, an excellent electromagnetic transducing characteristic especially in short wavelength regions and high reliability.
摘要翻译：在非磁性载体的至少一个表面上设置的磁性层中主要与粘结剂一起含有的铁磁性合金粉末的平均长轴长度（L）小于0.10μm，铁磁性合金粉末含有Co 相对于Fe为15〜28原子％的含量，此外，相对于从上述平均长轴长度（L）算出的比表面积（Sc），含有Y为22μmol/ m 2以上的Y ）和微晶直径（d）。涂布型高记录密度磁记录介质具有优异的表面性能，特别是在短波长区域和高可靠性下具有优异的电磁感应特性。

7. 发明授权

US07601395B2 Magnetic recording medium and method for manufacturing the same 有权
标题翻译：磁记录介质及其制造方法
公开(公告)号：US07601395B2
公开(公告)日：2009-10-13
申请号：US11032080
申请日：2005-01-11
申请人： Takayoshi Kuwajima , Sadafumi Iijima
发明人： Takayoshi Kuwajima , Sadafumi Iijima
IPC分类号： B05D3/02
CPC分类号： G11B5/7022 , G11B5/7013
摘要： A high recording density magnetic recording medium and a manufacturing method therefor are provided. The dilution stability during preparation of magnetic paint is improved and, thereby, even when the magnetic paint concentration is lowered, no problem occurs with the surface roughness and the output of the thin magnetic layer. The magnetic recording medium includes at least a magnetic layer on one surface of a non-magnetic support, wherein the magnetic layer contains a magnetic powder, a vinyl chloride resin having a degree of polymerization of at least 270 and an aliphatic polyester polyurethane resin to serve as binder resins, an aromatic compound having a substituent R (where R is —COOH, —(COOH)2, —OPO(OH)2, —PO(OH)2, or —SO3H), and a phosphoric acid ester. The ratio of binder resins in the magnetic paint is set at 2.0 percent by weight or less relative to a total sum of the binder resins and a solvent.
摘要翻译：提供了一种高记录密度磁记录介质及其制造方法。磁性涂料制备过程中的稀释稳定性提高，即使磁性涂料浓度降低，也不会发生薄磁性层的表面粗糙度和输出问题。磁记录介质至少包括在非磁性载体的一个表面上的磁性层，其中磁性层含有磁性粉末，聚合度至少为270的氯乙烯树脂和用于服务的脂族聚酯聚氨酯树脂作为粘合剂树脂，具有取代基R（其中R是-COOH， - （COOH）2，-OPO（OH）2，-PO（OH）2或-SO 3 H）的芳族化合物和磷酸酯。磁性涂料中的粘合剂树脂的比例相对于粘合剂树脂和溶剂的总和设定为2.0重量％以下。

8. 发明授权

US07563522B2 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US07563522B2
公开(公告)日：2009-07-21
申请号：US11555897
申请日：2006-11-02
申请人： Naoto Yajima , Takayoshi Kuwajima , Akihiko Seki , Hiroyuki Yamada , Kenichi Kitamura
发明人： Naoto Yajima , Takayoshi Kuwajima , Akihiko Seki , Hiroyuki Yamada , Kenichi Kitamura
IPC分类号： G11B5/66 , G11B5/64
CPC分类号： G11B5/70 , G11B5/00813 , G11B5/714 , G11B5/738 , G11B5/78 , G11B2005/001 , Y10T428/12993
摘要： The present invention provides a magnetic recording medium comprising a magnetic layer with excellent surface smoothness, which comprises a thin film magnetic layer of thickness in a range from 0.03 to 0.30 μm that is ideal for short wavelength recording, and displays superior electromagnetic conversion characteristics. The magnetic recording medium comprises a magnetic layer containing at least a ferromagnetic powder and a binder resin on one surface of a non-magnetic support, wherein the thickness of the magnetic layer is within a range from 0.03 to 0.30 μm, and the number of concavities with a depth of 30 nm or greater in the surface of the magnetic layer is 5 per 1 cm2 of surface area or less. Preferably, the value of the average depth Rv6 of the surface of the magnetic layer, as measured by a contact type surface roughness meter, is 12 nm or less.
摘要翻译：本发明提供一种包括具有优异表面平滑度的磁性层的磁记录介质，其包括厚度在0.03至0.30μm范围内的薄膜磁性层，这对于短波长记录是理想的，并且显示出优异的电磁转换特性。磁记录介质包括在非磁性载体的一个表面上至少含有铁磁粉末和粘合剂树脂的磁性层，其中磁性层的厚度在0.03至0.30μm的范围内，并且凹部的数量磁性层的表面的深度为30nm以上的表面积为1cm 2以下。优选地，通过接触型表面粗糙度计测量的磁性层的表面的平均深度Rv6的值为12nm以下。

9. 发明申请

US20070160876A1 MAGNETIC RECORDING MEDIUM 有权
标题翻译：磁记录介质
公开(公告)号：US20070160876A1
公开(公告)日：2007-07-12
申请号：US11555897
申请日：2006-11-02
申请人： Naoto Yajima , Takayoshi Kuwajima , Akihiko Seki , Hiroyuki Yamada , Kenichi Kitamura
发明人： Naoto Yajima , Takayoshi Kuwajima , Akihiko Seki , Hiroyuki Yamada , Kenichi Kitamura
IPC分类号： G11B5/708
CPC分类号： G11B5/70 , G11B5/00813 , G11B5/714 , G11B5/738 , G11B5/78 , G11B2005/001 , Y10T428/12993
摘要： The present invention provides a magnetic recording medium comprising a magnetic layer with excellent surface smoothness, which comprises a thin film magnetic layer of thickness in a range from 0.03 to 0.30 μm that is ideal for short wavelength recording, and displays superior electromagnetic conversion characteristics. The magnetic recording medium comprises a magnetic layer containing at least a ferromagnetic powder and a binder resin on one surface of a non-magnetic support, wherein the thickness of the magnetic layer is within a range from 0.03 to 0.30 μm, and the number of concavities with a depth of 30 nm or greater in the surface of the magnetic layer is 5 per 1 cm2 of surface area or less. Preferably, the value of the average depth Rv6 of the surface of the magnetic layer, as measured by a contact type surface roughness meter, is 12 nm or less.
摘要翻译：本发明提供一种包括具有优异表面平滑度的磁性层的磁记录介质，其包括厚度在0.03至0.30μm范围内的薄膜磁性层，这对于短波长记录是理想的，并且显示出优异的电磁转换特性。磁记录介质包括在非磁性载体的一个表面上至少含有铁磁粉末和粘合剂树脂的磁性层，其中磁性层的厚度在0.03至0.30μm的范围内，并且凹部的数量磁性层表面的深度为30nm以上的表面积为1cm 2以下。优选地，通过接触型表面粗糙度计测量的磁性层的表面的平均深度Rv6的值为12nm以下。

10. 发明授权

US06777061B2 Magnetic recording medium and process for producing the same 有权
公开(公告)号：US06777061B2
公开(公告)日：2004-08-17
申请号：US10397846
申请日：2003-03-27
申请人： Kenichi Kitamura , Takayoshi Kuwajima , Sadafumi Iijima
发明人： Kenichi Kitamura , Takayoshi Kuwajima , Sadafumi Iijima
IPC分类号： G11B5714
CPC分类号： G11B5/738 , G11B5/714 , G11B5/84 , Y10T428/1164 , Y10T428/1179 , Y10T428/25 , Y10T428/257 , Y10T428/265
摘要： The present invention provides a high recording density magnetic recording medium with improved dropout and excellent surface smoothness and electromagnetic conversion characteristics, as well as a process for producing such a medium. A magnetic recording medium comprising a lower non-magnetic layer containing at least a non-magnetic powder and a binder resin on one surface of a non-magnetic support, an upper magnetic layer containing at least a ferromagnetic powder and a binder resin on said lower non-magnetic layer, and a back coat layer on an opposite surface of said non-magnetic support, wherein said lower non-magnetic layer contains an acicular powder of hydrated iron oxide as the non-magnetic powder, said ferromagnetic powder has an average long axial length of 0.1 &mgr;m or less, and said upper magnetic layer has a surface roughness (center line average roughness: Ra) of 2.4 nm or less. After curing the lower non-magnetic layer, the magnetic layer is applied and formed.

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