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公开(公告)号：US20070065684A1
公开(公告)日：2007-03-22
申请号：US11520621
申请日：2006-09-14
IPC分类号： G11B5/702
CPC分类号： G11B5/7021 , G11B5/714 , G11B5/7305 , Y10T428/25
摘要： A magnetic recording medium is provided that comprises a non-magnetic support and at least one magnetic layer above the support, the magnetic layer comprising a ferromagnetic powder dispersed in a binder, and the binder comprising a polyurethane resin having a weight-average molecular weight of 200,000 to 400,000. There is also provided a magnetic recording medium that comprises a non-magnetic support, a non-magnetic layer above the support, the non-magnetic layer comprising a non-magnetic powder dispersed in a binder, and at least one magnetic layer above the non-magnetic layer, the magnetic layer comprising a ferromagnetic powder dispersed in a binder and the binder of the magnetic layer and/or the non-magnetic layer comprising a polyurethane resin having a weight-average molecular weight of 200,000 to 400,000.
摘要翻译： 提供一种磁记录介质，其包括非磁性载体和在载体上方的至少一个磁性层，所述磁性层包含分散在粘合剂中的铁磁性粉末，所述粘合剂包含重均分子量为 20万到40万。 还提供了一种磁记录介质，其包括非磁性载体，载体上方的非磁性层，非磁性层包含分散在粘结剂中的非磁性粉末，以及至少一个磁性层， 磁性层，磁性层包含分散在粘合剂中的铁磁粉末和磁性层和/或非磁性层的粘合剂，其包含重均分子量为200,000至400,000的聚氨酯树脂。
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公开(公告)号：US20050238925A1
公开(公告)日：2005-10-27
申请号：US11109653
申请日：2005-04-20
CPC分类号： G11B5/7026 , B32B27/18 , G11B5/70605 , G11B5/70678 , G11B5/714 , G11B5/738
摘要： A magnetic recording medium is provided that includes a non-magnetic support, a radiation-cured layer cured by exposing a layer containing a radiation curing compound to radiation, and a magnetic layer comprising a ferromagnetic powder dispersed in a binder. The radiation-cured layer and the magnetic layer are provided in that order above the non-magnetic support. The radiation curing compound has a C2 to C18 alkyl group, a C6 to C10 cyclic structure, and two or more radiation curing functional groups per molecule.
摘要翻译： 提供了一种磁记录介质，其包括非磁性载体，通过将含有辐射固化化合物的层暴露于辐射而固化的辐射固化层和包含分散在粘合剂中的铁磁性粉末的磁性层。 辐射固化层和磁性层以非磁性载体上方的顺序设置。 辐射固化化合物具有C2至C18烷基，C6至C10环状结构和每个分子两个或更多个辐射固化官能团。
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公开(公告)号：US20050181241A1
公开(公告)日：2005-08-18
申请号：US11089067
申请日：2005-03-24
申请人： Bruce Edwards
发明人： Bruce Edwards
CPC分类号： G11B5/70 , G11B5/7021 , G11B5/7023 , G11B5/714 , G11B5/735 , G11B5/738 , Y10T428/25 , Y10T428/257
摘要： A dual-layer magnetic recording medium including a non-magnetic substrate having a front side and a back side, a lower support layer formed over the front side and a magnetic upper recording layer formed over the lower layer, wherein the magnetic layer contains a volume concentration of at least about 35% of a magnetic metallic particulate pigment having a coercivity of at least about 2000 Oersteds (Oe), and a binder system for the pigment. The magnetic recording medium exhibits an orientation ratio greater than 2.0, a pulsewidth (PW50) value of less than about 500 nm, and a remanence-thickness product, Mr*t, of less than about 5.0 memu/cm2.
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公开(公告)号：US06896959B2
公开(公告)日：2005-05-24
申请号：US10441419
申请日：2003-05-19
申请人： Bruce H. Edwards
发明人： Bruce H. Edwards
CPC分类号： G11B5/70 , G11B5/7021 , G11B5/7023 , G11B5/714 , G11B5/735 , G11B5/738 , Y10T428/25 , Y10T428/257
摘要： A dual-layer magnetic recording medium including a non-magnetic substrate having a front side and a back side, a lower support layer formed over the front side and a magnetic upper recording layer formed over the lower layer, wherein the magnetic layer contains a volume concentration of at least about 35% of a magnetic metallic particulate pigment having a coercivity of at least about 2000 Oersteds (Oe), and a binder system for the pigment. The magnetic recording medium exhibits an orientation ratio greater than 2.0, a pulsewidth (PW50) value of less than about 500 nm, and a remanence-thickness product, Mr*t, of less than about 5.0 memu/cm2.
摘要翻译： 一种双层磁记录介质，包括具有前侧和后侧的非磁性基板，在前侧形成的下支撑层和形成在下层上的磁上记录层，其中磁层包含体积 浓度至少约35％的具有至少约2000奥斯特（Oe）的矫顽力的磁性金属颗粒颜料和用于颜料的粘合剂体系。 磁记录介质的取向比大于2.0，脉冲宽度（PW50）值小于约500nm，剩磁厚度乘积Mr * t小于约5.0 memu / cm 2， SUP>。
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公开(公告)号：US20050031908A1
公开(公告)日：2005-02-10
申请号：US10896948
申请日：2004-07-23
申请人： Yasushi Hattori , Koukichi Waki
发明人： Yasushi Hattori , Koukichi Waki
CPC分类号： G11B5/70605 , G11B5/72 , G11B5/73
摘要： The present invention provides a magnetic recording medium sequentially having a magnetic layer, a protective layer and a lubricant layer, on a substrate, and the magnetic layer contains magnetic particles having ferromagnetic ordered alloys having a CuAu or Cu3Au crystal structure in a metal oxide matrix. The protective layer preferably contains at least one of carbon and silicon, and the lubricant layer preferably contains fluorine. The invention provides a magnetic recording medium having a high film strength with a magnetic layer having a high adhesion to the substrate, and exhibiting good electromagnetic conversion characteristics.
摘要翻译： 本发明提供了一种在基板上依次具有磁性层，保护层和润滑剂层的磁记录介质，并且该磁性层含有在金属氧化物基体中具有CuAu或Cu3Au晶体结构的具有铁磁性有序合金的磁性颗粒。 保护层优选含有碳和硅中的至少一种，并且润滑剂层优选含有氟。 本发明提供了一种具有高膜强度的磁记录介质，其具有对基片的高粘合性的磁性层，并且具有良好的电磁转换特性。
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46.发明申请Data storage media having a sublayer containing a pigment combination having balanced pigment weight ratios 审中-公开数据存储介质，其具有含有平衡颜料重量比的颜料组合的子层公开(公告)号：US20050025998A1
公开(公告)日：2005-02-03
申请号：US10630410
申请日：2003-07-30
申请人： Richard Fuller
发明人： Richard Fuller
CPC分类号： G11B5/714 , G11B5/70 , G11B5/7022 , G11B5/708 , G11B5/71 , G11B5/73 , G11B5/735 , Y10T428/24942 , Y10T428/257
摘要： A dual-layer magnetic recording medium comprising a non-magnetic substrate having a front side and a back side, the front side having at least one lower support layer formed over the substrate and at least one magnetic upper layer formed over the at least one support layer, wherein the magnetic upper layer includes magnetic pigment particles having an average particle length of less than about 75 nanometers, and a binder system for the magnetic particles, and the lower support layer includes a pigment combination having a pigment weight ratio of from about 84% to about 92% alpha iron oxide, from about 1 to about 10 parts alumina per hundred parts alpha iron oxide, and from about 3 to about 15 parts carbon black per hundred parts alpha iron oxide, wherein the magnetic recording medium exhibits a resistivity of no more than about 1×109 ohms/square.
摘要翻译： 一种双层磁记录介质，包括具有前侧和后侧的非磁性基板，所述前侧具有形成在所述基板上的至少一个下支撑层，以及形成在所述至少一个支撑件上的至少一个磁上层 层，其中所述磁性上层包括平均颗粒长度小于约75纳米的磁性颜料颗粒和用于磁性颗粒的粘合剂体系，并且所述下部支撑层包含颜料组合，其颜料重量比为约84 ％至约92％的α氧化铁，约1至约10份氧化铝/百份α-氧化铁，和约3至约15份炭黑/百份α-氧化铁，其中磁记录介质表现出电阻率 不超过约1×10 9欧姆/平方。
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47.发明授权Magnetic recording medium having a binder system including a polyurethane polymer having both phosphonate and quaternary ammonium pendant groups 失效具有包含具有膦酸酯和季铵侧基的聚氨酯聚合物的粘合剂体系的磁记录介质
公开(公告)号：US6139982A
公开(公告)日：2000-10-31
申请号：US187824
申请日：1998-11-06
CPC分类号： G11B5/7026 , G11B5/7021 , G11B5/7022 , Y10S428/90
摘要： A magnetic recording medium comprising a magnetic layer provided upon a major surface of a substrate, wherein the magnetic layer includes a magnetic pigment, and a polymeric binder system containing a polyurethane having (1) a plurality of pendant phosphonate ester groups effective for promoting wetting of the magnetic pigment by the polymeric binder system, and (2) at least one quaternary ammonium group effective for promoting wetting of the magnetic pigment by the polymeric binder system.
摘要翻译： 一种磁记录介质，包括设置在基板的主表面上的磁性层，其中所述磁性层包括磁性颜料，以及含有聚氨酯的聚合物粘合剂体系，所述聚氨酯具有（1）多个侧链膦酸酯基侧基， 通过聚合物粘合剂体系的磁性颜料，和（2）至少一种有效促进由聚合物粘合剂体系润湿磁性颜料的季铵基团。
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公开(公告)号：US06139937A
公开(公告)日：2000-10-31
申请号：US179670
申请日：1998-10-27
IPC分类号： C09D175/06 , G01Q60/00 , G11B5/70 , G11B5/702 , G11B5/706 , G11B5/71 , G11B5/714 , G11B5/738 , G11B5/84
CPC分类号： G11B5/84 , G11B5/70 , G11B5/7022 , G11B5/70621 , G11B5/71 , G11B5/714 , Y10S428/90 , Y10T428/24355
摘要： A magnetic recording medium in which the bearing ratio Tp of the magnetic layer on a slice level at a depth of 45 nm from the highest peak of the surface profile measured with an atomic force microscope is 3% to 60%, and the difference .DELTA..mu. between the maximum frictional coefficient and the minimum frictional coefficient of the magnetic layer ranges from 0.1 to 0.0001 as measured under conditions of 5 mm.sup.2 in contact area, 2 g in weight of a measuring head, 0.04 to 0.2 N in load applied, 3 mm/sec in speed, and 140 mm in length of measurement.
摘要翻译： 磁性记录介质，其中使用原子力显微镜测量的表面轮廓的最高峰处的深度为45nm的切片层上的磁性层的承载比Tp为3％〜60％，差ΔTA 在接触面积为5mm 2的条件下测量的磁性层的最大摩擦系数和最小摩擦系数在0.1至0.0001的范围内，测量头的重量为2g，负载中为0.04至0.2N，3mm / 秒，测量长度为140毫米。
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公开(公告)号：US6074724A
公开(公告)日：2000-06-13
申请号：US918864
申请日：1997-08-26
申请人： Hiroo Inaba , Kiyomi Ejiri , Masaki Suzuki , Koji Naoe , Yuichiro Murayama , Hiroaki Takano
发明人： Hiroo Inaba , Kiyomi Ejiri , Masaki Suzuki , Koji Naoe , Yuichiro Murayama , Hiroaki Takano
CPC分类号： B82Y15/00 , G11B5/7021 , G11B5/7022 , G11B5/70621 , Y10S428/90 , Y10T428/24355 , Y10T428/25 , Y10T428/257 , Y10T428/265
摘要： A magnetic recording medium is disclosed, which comprises a support having thereon a magnetic layer comprising a binder and a ferromagnetic powder dispersed therein, wherein said binder comprises a polyurethane resin having at least one cyclic hydrocarbon group and at least one ether linkage, and said ferromagnetic powder is a ferromagnetic metallic powder which comprises Fe and has a mean major-axis length of from 0.05 to 0.19 .mu.m and a crystallite size of from 100 to 230 .ANG.; and further a magnetic recording medium is disclosed, comprising a support having thereon in succession an undercoat layer comprising a binder U and an inorganic powder dispersed therein and a magnetic layer comprising a binder M and a ferromagnetic powder dispersed therein, wherein at least either of the binder U or M comprises a polyurethane resin having at least one cyclic hydrocarbon group and at least one ether linkage and said ferromagnetic powder is a ferromagnetic metallic powder which comprises Fe and has a mean major-axis length of from 0.05 to 0.19 .mu.m and a crystallite size of from 100 to 230 .ANG..
摘要翻译： 公开了一种磁记录介质，其包括其上具有包含粘合剂和分散在其中的铁磁粉末的磁性层的载体，其中所述粘合剂包含具有至少一个环状烃基和至少一个醚键的聚氨酯树脂，并且所述铁磁性 粉末是含铁的铁磁性金属粉末，其平均长轴长度为0.05至0.19μm，微晶尺寸为100至230安培; 并且还公开了一种磁记录介质，包括其上连续地具有包含粘合剂U和分散在其中的无机粉末的底涂层的支撑体和包含粘合剂M和分散在其中的铁磁性粉末的磁性层，其中， 粘合剂U或M包含具有至少一个环状烃基和至少一个醚键的聚氨酯树脂，并且所述铁磁性粉末是包含Fe并且具有0.05至0.19μm的平均长轴长度的铁磁性金属粉末，以及 微晶尺寸为100至230安培。
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公开(公告)号：US6071605A
公开(公告)日：2000-06-06
申请号：US98428
申请日：1998-06-17
申请人： Takao Kudo
发明人： Takao Kudo
CPC分类号： G11B5/8404 , G11B5/738 , Y10S428/90 , Y10T428/25
摘要： The present invention provides a magnetic recording medium including a lower non-magnetic layer mainly consisting of a non-magnetic powder and a binder and an upper magnetic layer mainly consisting of a magnetic powder and a binder which layers are formed on a non-magnetic support body, wherein the binder of the lower non-magnetic layer is a vinyl chloride copolymer having a sulfonic acid base and/or a quaternary ammonium base and hydroxy group and epoxy group, and having an average polymerization degree of 100 to 220, and the non-magnetic powder is a non-magnetic powder having a longer axis length of 0.2 .mu.m or below and an acid surface.
摘要翻译： 本发明提供了一种磁记录介质，其包括主要由非磁性粉末和粘合剂组成的下部非磁性层和主要由磁性粉末和粘结剂组成的上部磁性层，所述磁性层主要由非磁性载体 其中所述下部非磁性层的粘合剂是具有磺酸碱和/或季铵碱和羟基和环氧基的氯乙烯共聚物，其平均聚合度为100至220， 磁性粉末是长轴长度为0.2μm以下的酸性表面的非磁性粉末。
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