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公开(公告)号：US20070026264A1
公开(公告)日：2007-02-01
申请号：US11461051
申请日：2006-07-31
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。
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公开(公告)号：US07157163B2
公开(公告)日：2007-01-02
申请号：US10823564
申请日：2004-04-14
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。
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公开(公告)号：US07563522B2
公开(公告)日：2009-07-21
申请号：US11555897
申请日：2006-11-02
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。
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公开(公告)号：US20070160876A1
公开(公告)日：2007-07-12
申请号：US11555897
申请日：2006-11-02
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。
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公开(公告)号：US07208237B2
公开(公告)日：2007-04-24
申请号：US10823680
申请日：2004-04-14
摘要： The present invention provides a magnetic recording medium comprising a thin film magnetic layer of thickness in a range from 0.03 to 0.30 μm, and having excellent surface smoothness and superior electromagnetic conversion characteristics. The magnetic recording medium comprises 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 the lower non-magnetic layer, and a back coat layer on the other surface of the non-magnetic support, wherein the thickness of the upper magnetic layer is within the range from 0.03 to 0.30 μm, the AFM surface roughness Ra of the upper magnetic layer is 6 nm or less, and the number of concavities with a depth of 30 nm or greater in the surface of the upper magnetic layer is 5 per 1 cm2 of surface area or less.
摘要翻译： 本发明提供一种磁记录介质，其包括厚度在0.03〜0.30μm范围内的薄膜磁性层，并且具有优异的表面平滑度和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非磁性粉末和粘合剂树脂的下部非磁性层，在下部的至少含有铁磁性粉末和粘合剂树脂的上部磁性层 非磁性层的非磁性层和背涂层，其中上磁性层的厚度在0.03〜0.30μm的范围内，上磁性层的AFM表面粗糙度Ra为 6nm以下，上磁性层的表面的深度为30nm以上的凹部的数量为每1cm 2以上的表面积以下。
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公开(公告)号：US07011900B2
公开(公告)日：2006-03-14
申请号：US10806096
申请日：2004-03-23
申请人： Akihiko Seki , Takayoshi Kuwajima , Naoto Yajima
发明人： Akihiko Seki , Takayoshi Kuwajima , Naoto Yajima
IPC分类号： G11B5/735
CPC分类号： G11B5/70 , G11B5/00813 , G11B5/735 , G11B5/78 , Y10T428/12465 , Y10T428/12993
摘要： A magnetic recording medium is prepared by coating a dispersion of non-magnetic powder and ferromagnetic powder in a binder and a dispersion of ferromagnetic powder in a binder to a non-magnetic substrate by a wet-on-wet coating technique to form subordinate and magnetic layers on the substrate, and subjecting the layers to magnetic field orientation. The subordinate layer has a Br of 80 to 400 gauss, and the magnetic layer has a thickness of 0.1 to 0.4 μm. The medium has surface smoothness and good electromagnetic characteristics and lends itself to recording and reproducing signals having a minimum wavelength of 0.2 to 0.7 μm.
摘要翻译： 通过湿式湿式涂布技术将非磁性粉末和铁磁性粉末的分散体涂布在粘合剂中，并将铁磁性粉末在粘合剂中的分散体涂覆在非磁性基材上，形成磁性记录介质 层，并且对层进行磁场取向。 下层具有80〜400高斯的Br，磁性层的厚度为0.1〜0.4μm。 该介质具有表面平滑度和良好的电磁特性，并且适用于记录和再现最小波长为0.2至0.7μm的信号。
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公开(公告)号：US6127039A
公开(公告)日：2000-10-03
申请号：US235382
申请日：1999-01-22
CPC分类号： G11B5/735 , G11B5/8404 , Y10S428/90 , Y10T428/31609 , Y10T428/31935
摘要： A magnetic recording medium comprising a non-magnetic base having on at least one side a non-magnetic layer (undercoat) containing electron beam-curable resins which in turn is over-laid with a magnetic layer (topcoat) containing an iron (Fe) based magnetic powder, said magnetic layer having a glass transition temperature (Tg) of at least 65.degree. C. and said non-magnetic layer being an electron beam cured coating that is formed by coating the non-magnetic base with a non-magnetic coating mix containing electron beam curable resins, the yet to be cured coating having a glass transition temperature (Tg) of 30-53.degree. C. and said electron beam curable resins comprising an electron beam curable vinyl chloride based resin having a sulfur-containing polar group and an electron beam curable urethane resin having a phosphorus-containing polar group. Also disclosed is a process for producing the magnetic recording medium, which has good electromagnetic conversion characteristics in a high-frequency range and which can be manufactured at high production rate.
摘要翻译： 一种磁记录介质，包括在至少一个侧面上具有含有电子束固化树脂的非磁性层（底涂层）的非磁性基底，该非磁性层又包含含有铁（Fe）的磁性层（面漆） 所述磁性层的玻璃化转变温度（Tg）至少为65℃，所述非磁性层是通过用非磁性涂层涂覆非磁性基底形成的电子束固化涂层 含有电子束固化树脂的混合物，尚待固化的涂层的玻璃化转变温度（Tg）为30-53℃，所述电子束固化树脂包含具有含硫极性基团的电子束固化氯乙烯基树脂 和具有含磷极性基团的电子束固化性聚氨酯树脂。 还公开了一种制造磁记录介质的方法，其在高频范围内具有良好的电磁转换特性，并且可以以高生产率制造。
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8.发明授权Magnetic recording medium having a magnetic layer and an intermediate layer of specified composition 失效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
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。
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公开(公告)号：US07090936B2
公开(公告)日：2006-08-15
申请号：US10397845
申请日：2003-03-27
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。
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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
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。
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