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公开(公告)号：US20080057351A1
公开(公告)日：2008-03-06
申请号：US11730176
申请日：2007-03-29
IPC分类号： G11B5/738
CPC分类号： G11B5/735 , G11B5/70678 , G11B5/714
摘要： A magnetic recording medium, which comprises: a backcoat layer; a nonmagnetic support; a nonmagnetic layer; and a magnetic layer, in this order, wherein the backcoat layer has Tg of from 65 to 95° C., and the binder constituting the backcoat layer satisfies the following requirements: (1) the binder comprises a vinyl chloride-based resin (PVC) and a polyurethane resin (PU); (2) PVC has a solubility parameter of from 9 to 11 (cal·cm3)1/2, Tg of from 65 to 95° C. and Mw of from 5000 to 25000; (3) a ratio of PVC to the total mass of PVC and PU is from 10 to 60% by mass; (4) PU has a solubility parameter of from 9.5 to 11.5 (cal·cm−3)1/2, Tg of from 80 to 110° C. and Mw of from 20000 to 60000; and (5) a ratio of PU to the total mass of PVC and PU is from 90 to 30% by mass.
摘要翻译： 一种磁记录介质，包括：背涂层; 非磁性支撑; 非磁性层; 和磁性层，其中背涂层的Tg为65〜95℃，构成背涂层的粘合剂满足以下要求：（1）粘合剂包括氯乙烯系树脂（PVC ）和聚氨酯树脂（PU）; （2）PVC的溶解度参数为9〜11（cal.cm 3）1/2，Tg为65〜95℃，Mw为 5000至25000; （3）PVC与PVC和PU的总质量的比率为10〜60质量％ （4）PU的溶解度参数为9.5〜11.5（cal.cm -3 -3）1/2，Tg为80〜110℃，Mw为 从20000到60000; 和（5）PU与PVC和PU的总质量的比例为90〜30质量％。
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公开(公告)号：US20070231613A1
公开(公告)日：2007-10-04
申请号：US11729844
申请日：2007-03-30
IPC分类号： G11B5/708
CPC分类号： G11B5/7085 , G11B5/70605 , G11B5/70626 , G11B5/70678 , G11B5/714 , G11B5/7305
摘要： A magnetic recording medium including a nonmagnetic support and a magnetic layer containing ferromagnetic powder and a binder, wherein the magnetic layer contains diamond particles having an average particle size of from 20 to 100 nm, a volume per a particle of the ferromagnetic powder is from 100 to 8,000 nm3, and the support has an intrinsic viscosity of from 0.40 to 0.60 dl/g and is substantially free from particles.
摘要翻译： 包含非磁性载体和含有铁磁粉末和粘合剂的磁性层的磁记录介质，其中磁性层含有平均粒径为20-100nm的金刚石颗粒，铁磁性粉末的每个颗粒的体积为100 至8,000nm 3，并且载体的特性粘度为0.40至0.60dl / g，并且基本上不含颗粒。
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公开(公告)号：US20070003797A1
公开(公告)日：2007-01-04
申请号：US11478640
申请日：2006-07-03
IPC分类号： G11B5/716
CPC分类号： G11B5/73
摘要： A magnetic recording medium including: a nonmagnetic support; a conductive layer containing at least one material selected from the group consisting of: metals; semimetals; alloys; oxides of metals, semimetals and alloys; and composites of metals, semimetals and alloys; and a magnetic layer containing ferromagnetic powder and a binder, provided in this order, wherein a surface of the conductive layer has a surface electric resistance of is from 1×102 Ω/□ to 1×1012 Ω/□.
摘要翻译： 一种磁记录介质，包括：非磁性载体; 含有选自金属中的至少一种材料的导电层; 半金属 合金; 金属，半金属和合金的氧化物; 金属，半金属和合金的复合材料; 以及含有铁磁粉末和粘合剂的磁性层，其中导电层的表面的表面电阻为1×10 2Ω/□至1×10 12， / SUP> Omega /□。
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公开(公告)号：US20060093869A1
公开(公告)日：2006-05-04
申请号：US11266186
申请日：2005-11-04
IPC分类号： G11B5/716
CPC分类号： G11B5/73 , G11B5/7026 , G11B5/70678 , G11B5/7305
摘要： A magnetic recording medium is provided that comprises a non-magnetic support and, in order above at least one surface thereof, a reinforcing layer comprising at least one material selected from the group consisting of metals, metalloids, and alloys, and oxides and composites thereof, a smoothing layer, and a magnetic layer comprising a ferromagnetic powder dispersed in a binder.
摘要翻译： 提供一种磁记录介质，其包括非磁性载体，并且在其至少一个表面上依次包括选自金属，准金属和合金中的至少一种材料的增强层及其氧化物及其复合材料 平滑层，以及包含分散在粘合剂中的铁磁性粉末的磁性层。
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公开(公告)号：US20050202288A1
公开(公告)日：2005-09-15
申请号：US11037060
申请日：2005-01-19
IPC分类号： G11B5/68
CPC分类号： G11B5/714 , G11B5/7305 , G11B5/733 , Y10T428/31794
摘要： A magnetic recording medium including a polymer support having thereon at least one magnetic layer containing a ferromagnetic metal powder having an average major axis length of from 20 to 100 nm or a ferromagnetic hexagonal ferrite powder having an average tabular diameter of from 5 to 40 nm and a binder, the polymer support having an intrinsic viscosity of from 0.47 to 0.51 dL/g, a Young's modulus in the machine direction of from 7.0 to 8.6 GPa, a Young's modulus in the transverse direction of from 5.4 to 8.0 GPa, and a breaking strength in the transverse direction of from 370 to 450 MPa.
摘要翻译： 一种磁记录介质，包括其上具有至少一个磁性层的聚合物载体，所述磁性层含有平均长轴长度为20至100nm的铁磁性金属粉末或平均片状直径为5至40nm的铁磁性六方铁氧体粉末，以及 粘合剂，特性粘度为0.47〜0.51dL / g的聚合物载体，纵向的杨氏模量为7.0〜8.6GPa，横向的杨氏模量为5.4〜8.0GPa，断裂 横向强度为370〜450MPa。
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公开(公告)号：US20070166571A1
公开(公告)日：2007-07-19
申请号：US11649792
申请日：2007-01-05
CPC分类号： G11B5/714 , G11B5/70 , G11B5/7305
摘要： An aspect of the present invention provides a magnetic recording medium comprising following layers in this order on at least one surface of a nonmagnetic support: a nonmagnetic layer including a nonmagnetic powder and a binder; and a magnetic layer including a magnetic powder and a binder, wherein the nonmagnetic support has an enthalpy relaxation (ΔH) equal to or more than 0.5 J/g and equal to or less than 2.0 J/g. According to the aspect of the present invention, a magnetic recording medium is provided that is superior in electromagnetic conversion (e.g., with a high S/N ratio for surface recording density) and running durability (e.g., with a small number of dropouts and a low error rate).
摘要翻译： 本发明的一个方面提供一种在非磁性载体的至少一个表面上依次包含以下层的磁记录介质：包括非磁性粉末和粘合剂的非磁性层; 以及包含磁性粉末和粘合剂的磁性层，其中所述非磁性载体具有等于或大于0.5J / g且等于或小于2.0J / g的焓弛豫（DeltaH）。 根据本发明的一个方面，提供了一种电磁转换（例如，用于表面记录密度的高S / N比）和运行耐久性优异的磁记录介质（例如，具有少数辍学和 低错误率）。
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公开(公告)号：US20060257693A1
公开(公告)日：2006-11-16
申请号：US11431614
申请日：2006-05-11
IPC分类号： G11B5/64
CPC分类号： G11B5/7305 , G11B5/73
摘要： A magnetic recording medium is provided that comprises in order a non-magnetic support having a degree of crystallinity of from 40% to 60% and a rigid amorphous content of from 20% to 60%, at least a reinforcing layer comprising a material selected from a group consisting of metals, metalloids and alloys, and oxides and composites thereof, a non-magnetic layer comprising a non-magnetic powder and a binder, and a magnetic layer comprising a ferromagnetic powder and a binder.
摘要翻译： 提供一种磁记录介质，其顺序包括具有40％至60％的结晶度和20％至60％的刚性无定形含量的非磁性载体，至少包含选自以下的材料的增强层： 由金属，准金属和合金组成的组，及其氧化物和复合材料，包含非磁性粉末和粘合剂的非磁性层以及包含铁磁性粉末和粘合剂的磁性层。
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公开(公告)号：US06890646B2
公开(公告)日：2005-05-10
申请号：US10413483
申请日：2003-04-15
CPC分类号： G11B5/714 , G11B5/733 , Y10T428/25 , Y10T428/251 , Y10T428/256 , Y10T428/257 , Y10T428/259
摘要： Provided is a particulate magnetic recording medium for high-density recording maintaining a high C/N ratio achieving good surface recording density, exhibiting little dropout, and having a low error rate. The magnetic recording medium comprises a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder and a binder in this order on at least one surface of a nonmagnetic support. Said nonmagnetic support comprises a filler having an aspect ratio ranging from 50 to 10,000 and a thickness ranging from 0.5 to 5 nm.
摘要翻译： 提供一种用于高密度记录的颗粒状磁记录介质，其保持高C / N比，实现良好的表面记录密度，显示出很小的压差，并且具有低误差率。 磁记录介质包括非磁性层，其包含非磁性粉末和粘合剂，以及磁性层，其包含铁磁粉末和粘合剂，其顺序在非磁性载体的至少一个表面上。 所述非磁性载体包括具有50至10,000的纵横比和0.5至5nm的厚度的填料。
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公开(公告)号：US06846555B2
公开(公告)日：2005-01-25
申请号：US10413510
申请日：2003-04-15
CPC分类号： G11B5/70678 , G11B5/7026 , G11B5/738 , Y10T428/25 , Y10T428/259 , Y10T428/265
摘要： Provided is a magnetic recording medium having high C/N, low error rate, and excellent running durability. The magnetic recording medium comprises a magnetic layer 1 comprising a ferromagnetic powder and a binder, or comprising a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer 2 comprising a ferromagnetic powder and a binder in this order on a nonmagnetic support. An undercoating layer comprising a clay mineral coated with an organic compound and a binder is comprised between the nonmagnetic support and the magnetic layer 1 or between the nonmagnetic support and the nonmagnetic layer, as well as said clay mineral coated with an organic compound has a thickness ranging from 0.5 to 5 nm and an aspect ratio ranging from 50 to 10,000.
摘要翻译： 提供了具有高C / N，低错误率和优异的运行耐久性的磁记录介质。 磁记录介质包括磁性层1，其包含铁磁性粉末和粘合剂，或者在非磁性载体上依次包含非磁性粉末和粘合剂的非磁性层和包含铁磁性粉末和粘合剂的磁性层2。 包含有机化合物和粘合剂的粘土矿物的底涂层包含在非磁性载体和磁性层1之间或非磁性载体和非磁性层之间，以及涂覆有机化合物的所述粘土矿物的厚度 范围为0.5至5nm，纵横比为50至10,000。
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公开(公告)号：US07960045B2
公开(公告)日：2011-06-14
申请号：US12239937
申请日：2008-09-29
CPC分类号： G11B5/7305 , G11B5/8404 , Y10T428/31855
摘要： An aspect of the present invention relates to a magnetic recording medium comprising a coating layer on a nonmagnetic support, wherein the coating layer comprises a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder and a binder in this order, the nonmagnetic support comprises a main component in the form of a resin obtained by mixing and/or copolymerizing a polyester and a polymer having compatibility with the polyester, has a glass transition temperature of equal to or higher than 80° C. but less than 125° C., and has a heat absorption peak, based on enthalpy relaxation, ranging from 0.5 to 2.0 J/g. Another aspect of the present invention relates to a method of manufacturing a magnetic recording medium.
摘要翻译： 本发明的一个方面涉及一种磁性记录介质，其包括在非磁性载体上的涂层，其中所述涂层包括非磁性层，包括非磁性粉末和粘合剂，以及包含铁磁性粉末和粘合剂的磁性层按此顺序 ，非磁性载体包括通过将聚酯和与聚酯具有相容性的聚合物混合和/或共聚获得的树脂形式的主要组分，其玻璃化转变温度等于或高于80℃但小于 125℃，基于焓弛豫，具有0.5〜2.0J / g的吸热峰。 本发明的另一方面涉及一种制造磁记录介质的方法。
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