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公开(公告)号：US4547393A
公开(公告)日：1985-10-15
申请号：US618803
申请日：1984-06-08
申请人： Takamitsu Asai , Tatsuji Kitamoto , Goro Akashi
发明人： Takamitsu Asai , Tatsuji Kitamoto , Goro Akashi
CPC分类号： G11B5/845 , G11B5/70626 , G11B5/7085
摘要： The present invention relates to an improved method for preparing a magnetic recording method having excellent magnetic orientation comprising the steps of (1) dispersing ferromagnetic fine particles which are plate-shaped and which have an axis of magnetization perpendicular to the plates of the particles in a binder and (2) coating a magnetic coating layer on a non-magnetic support wherein the method comprises, after coating the magnetic coating layer and before drying it, subjecting the surface of the magnetic layer to a magnetic field from the direction perpendicular to the support to produce a magnetic orientation while contacting the surface of the magnetic layer with a flexible smoothening sheet.
摘要翻译： 本发明涉及一种制备具有优异磁性取向性的磁记录方法的改进方法，包括以下步骤：（1）将板状的铁磁细颗粒分散在其中，并将磁性轴垂直于颗粒的平板 粘合剂和（2）在非磁性载体上涂覆磁性涂层，其中所述方法包括在涂覆磁性涂层之后并在其干燥之前，使磁性层的表面从垂直于载体的方向受到磁场 以在磁性层的表面与柔性平滑片接触的同时产生磁性取向。
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公开(公告)号：US4678682A
公开(公告)日：1987-07-07
申请号：US496734
申请日：1983-05-20
CPC分类号： G11B5/845
摘要： The perpendicular magnetic orientation of a magnetic layer containing platelet-form ferromagnetic particles coated on a web support is effectively performed by passing a web having thereon the coated magnetic layer in an undried state through a magnetic field formed by plural pairs of opposite pole type magnets disposed in the travelling direction of the web with a gap between adjacent pairs of magnets, while supplying drying air through each gap onto the surface of the travelling web to substantially complete the drying of the coated layer while the web is in the magnetic field. A partition may be inserted in each gap so that the lower end of the partition is close to the upper surface of the travelling web to divide the gap into a front section and a back section, and the drying air may be passed through these sections.
摘要翻译： 通过使其上具有涂覆的磁性层的卷材在未干燥状态下通过由多对成对的相对极型磁体形成的磁场而使包含在片状载体上的含有片状铁磁颗粒的磁性层的磁性层的垂直磁性取向 在相邻成对的磁体之间具有间隙的幅材的行进方向上，同时通过每个间隙将干燥空气提供到行进幅材的表面上，以在幅材处于磁场的同时基本上完成涂覆层的干燥。 可以在每个间隙中插入隔板，使得隔板的下端靠近行进网的上表面，以将间隙分成前部和后部，并且干燥空气可以通过这些部分。
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公开(公告)号：US4911997A
公开(公告)日：1990-03-27
申请号：US080178
申请日：1987-07-31
申请人： Takamitsu Asai , Masaaki Fujiyama
发明人： Takamitsu Asai , Masaaki Fujiyama
CPC分类号： G11B5/716 , Y10T428/256 , Y10T428/257
摘要： A magnetic recording medium whose output is increased over a wide range of from long wavelengths to short wavelengths and whose output fluctuation with rotation period is decreased when rotating and reproducing in the form of a disk is provided comprising a non-magnetic support and a magnetic layer provided thereon containing a ferromagnetic substance, the magnetic layer having a multilayer structure consisting of a lower layer containing a ferromagnetic substance in an ellipsoidal shape with ##EQU1## and a saturation magnetization of at least 60 emu/g and an upper layer containing a ferromagnetic substance of plate-shaped hexagonal system having the axis of easy magnetization in the vertical direction to the plate surface.
摘要翻译： 一种磁记录介质，其在从长波长到短波长的宽范围内增加输出，并且当以盘的形式旋转和再现时，其旋转周期的输出波动减小，包括非磁性支撑和磁性层 在其上设置有含有铁磁物质的磁性层，该磁性层具有多层结构，该多层结构由含有椭圆形状的铁磁物质和至少60emu / g的饱和磁化强度的下层组成，上层含有铁磁性物质 具有在与板表面垂直的方向上容易磁化的轴的板状六边形系统。
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公开(公告)号：US4552808A
公开(公告)日：1985-11-12
申请号：US554658
申请日：1983-11-23
IPC分类号： G11B5/70 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , G11B5/706 , G11B5/714 , G11B5/73 , G11B5/68
CPC分类号： G11B5/70678 , G11B5/714 , Y10S428/90 , Y10T428/256 , Y10T428/257 , Y10T428/265 , Y10T428/31
摘要： A magnetic recording material is disclosed which is comprised of a single magnetic layer comprised of plate-shaped ferromagnetic particles wherein the plate-shaped ferromagnetic particles are present in greater number in the surface part of the magnetic layer than in the inner part and/or the plate-shaped ferromagnetic particles are aligned such that an average horizontal axis component of the particles with respect to the surface of magnetic layer is larger in the surface part than in the inner part. The location and alignment of the particles make is possible to increase output with short-wave recording.
摘要翻译： 公开了一种磁记录材料，其由包括板状铁磁性颗粒的单个磁性层组成，其中板状铁磁性颗粒在磁性层的表面部分中比在内部部分和/或 排列板状铁磁性粒子，使得颗粒相对于磁性层表面的平均水平轴分量在表面部分比在内部部分大。 颗粒的位置和排列可以通过短波记录来增加输出。
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公开(公告)号：US4726992A
公开(公告)日：1988-02-23
申请号：US873922
申请日：1986-06-13
IPC分类号： C09D5/23 , C09D127/04 , C09D127/06 , C09D169/00 , C09D175/00 , C09D175/04 , G11B5/702 , G11B5/706 , G11B5/70
CPC分类号： G11B5/7022 , Y10S428/90 , Y10T428/25 , Y10T428/257 , Y10T428/31507 , Y10T428/31551 , Y10T428/31609
摘要： A magnetic recording medium is described, comprising a non-magnetic support having provided thereon a magnetic layer having magnetic particles being ferromagnetic hexagonal crystallized tabular shape particles having an axis of easy magnetization in a direction vertical to a flat surface thereof, said binder being present in an amount of from 10 to 30 wt % based on the weight of the magnetic particles, and said binder comprising a polycarbonate polyurethane being present in an amount of from 20 to 60 wt %, a vinyl chloride and vinyl acetate type copolymer being present in an amount of from 20 to 70 wt %, and a polyisocyanate being present in an amount of from 10 to 60 wt %, based on the total amount of binder.
摘要翻译： 描述了一种磁记录介质，其包括非磁性载体，其上设置有磁性层，该磁性层具有铁磁性六方晶系结晶的平板状颗粒，该磁性颗粒在垂直于其平坦表面的方向上具有容易磁化的轴线，所述粘合剂存在于 相对于磁性粒子的重量为10〜30重量％，所述粘合剂含有聚碳酸酯聚氨酯，其含量为20〜60重量％，氯乙烯和乙酸乙烯酯型共聚物存在于 的量为20至70重量％，多异氰酸酯的存在量为基于粘合剂总量的10至60重量％。
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公开(公告)号：US4666770A
公开(公告)日：1987-05-19
申请号：US753829
申请日：1985-07-11
申请人： Takamitsu Asai , Masaaki Fujiyama
发明人： Takamitsu Asai , Masaaki Fujiyama
IPC分类号： C09D5/23 , C09D127/04 , C09D127/06 , G11B5/70 , G11B5/706 , G11B5/708
CPC分类号： G11B5/708 , G11B5/70 , G11B5/70678 , Y10S428/90 , Y10T428/25
摘要： A magnetic recording medium having an improved surface smoothness of the coating layer, improved degree of orientation in a magnetic field and increased output is provided which comprises a non-magnetic support and a magnetic recording layer provided thereon containing a ferromagnetic substance of plate-shaped hexagonal system, and having a surface gloss value of 180% or more.
摘要翻译： 提供了具有改善的涂层表面平滑度，改善的磁场取向度和增加的输出的磁记录介质，其包括非磁性载体和设置在其上的磁记录层，其上含有板状六边形的铁磁性物质 并且具有180％或更高的表面光泽度值。
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公开(公告)号：US4657814A
公开(公告)日：1987-04-14
申请号：US553945
申请日：1983-11-21
申请人： Takamitsu Asai , Masaaki Fujiyama
发明人： Takamitsu Asai , Masaaki Fujiyama
CPC分类号： G11B5/70678 , G11B5/714 , G11B5/7305 , Y10S428/90 , Y10T428/257 , Y10T428/265 , Y10T428/31678 , Y10T428/31681 , Y10T428/31786
摘要： A magnetic recording medium is disclosed. The medium is comprised of a support base having provided thereon a non-magnetic metal layer and a magnetic layer. The magnetic layer is comprised of plate-shaped magnetic particles having an axis of easy magnetization perpendicular to the plane of the plate-shaped magnetic particles dispersed in a binder. The non-magnetic metal layer is preferably comprised of a metal selected from the group consisting of Al, Cu, Zn, Sn, Ti and alloys thereof. The recording medium has high S/N ratio, reduced drop out, high output, excellent durability and running properties.
摘要翻译： 公开了一种磁记录介质。 介质由其上设置有非磁性金属层和磁性层的支撑基底构成。 磁性层由具有垂直于分散在粘合剂中的板状磁性颗粒的平面的容易磁化的轴的板状磁性颗粒构成。 非磁性金属层优选由选自Al，Cu，Zn，Sn，Ti及其合金的金属组成。 记录介质具有高S / N比，降低的降低，高输出，优异的耐久性和运行性能。
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公开(公告)号：US4678706A
公开(公告)日：1987-07-07
申请号：US791174
申请日：1985-10-24
IPC分类号： C10M103/02 , C09D5/23 , C09D101/18 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , C10M103/06 , C10N10/04 , C10N10/08 , C10N40/18 , G11B5/73 , G11B5/735 , G11B5/72
CPC分类号： G11B5/735 , Y10S428/90 , Y10T428/25 , Y10T428/256 , Y10T428/258 , Y10T428/265
摘要： A magnetic recording medium is described, comprising a non-magnetic support, a magnetic recording layer on one side of the support, and a backing layer on the opposite side of the support to the magnetic recording layer, wherein said backing layer comprising a binder and a powder dispersed in the binder, wherein the powder is a powdered oxide represented by the formula M.sup.1.M.sup.2.O.sub.2+x (wherein M.sup.1 is at least one element selected from the group consisting of Ba, Sr, Pb and Ca, M.sup.2 is at least one element selected from the group consisting of Ti, Zr and Sn, and x is in the range of from 0 to 0.9) or a mixture of said powdered oxide and carbon black. This magnetic recording medium has a decreased coefficient of friction, is free from formation of scratches, has good durability, and furthermore, maintains good S/N characteristics.
摘要翻译： 描述了一种磁记录介质，其包括非磁性支撑体，在支撑体的一侧上的磁记录层，以及位于与磁记录层的支撑体相反侧的背衬层，其中所述背衬层包括粘合剂和 分散在所述粘合剂中的粉末，其中所述粉末是由式M1.M2.O 2 + x（其中M1是选自Ba，Sr，Pb和Ca，M2中的至少一种元素）所代表的粉末状氧化物 至少一种选自Ti，Zr和Sn的元素，x在0至0.9的范围内）或所述粉末状氧化物和炭黑的混合物。 该磁记录介质具有降低的摩擦系数，没有形成划痕，具有良好的耐久性，并且还保持良好的S / N特性。
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9.发明授权
公开(公告)号：US4629653A
公开(公告)日：1986-12-16
申请号：US677407
申请日：1984-12-03
申请人： Takamitsu Asai , Masaaki Fujiyama , Minoru Kanazawa , Nobuo Aoki
发明人： Takamitsu Asai , Masaaki Fujiyama , Minoru Kanazawa , Nobuo Aoki
IPC分类号： G11B5/70 , C09D5/23 , C09D127/04 , C09D127/08 , G11B5/706 , G11B5/708 , G11B5/714
CPC分类号： G11B5/714 , G11B5/70678 , Y10S428/90 , Y10T428/256 , Y10T428/257
摘要： A magnetic recording medium is described, comprising a non-magnetic support having provided thereon a magnetic layer containing ferromagnetic particles and a binder, wherein said ferromagnetic particles have a tabular ratio (table diameter/table thickness) of 2 or more, a table diameter of from 0.01 to 10 .mu.m, and a lamination degree of the magnetic particles in the magnetic layer in a cross-section thereof of 2 or more.
摘要翻译： 描述了一种磁记录介质，其包括在其上设置有含有铁磁颗粒和粘合剂的磁性层的非磁性载体，其中所述铁磁颗粒具有2或更大的平板比（表直径/台厚度），表直径 0.01〜10μm，磁性层的磁性粒子的横截面为2以上的层叠度。
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公开(公告)号：US4740419A
公开(公告)日：1988-04-26
申请号：US878742
申请日：1986-06-26
申请人： Takamitsu Asai , Masaaki Fujiyama , Haruo Masuda
发明人： Takamitsu Asai , Masaaki Fujiyama , Haruo Masuda
CPC分类号： G11B5/70678 , G11B5/714 , Y10S428/90 , Y10T428/25
摘要： A magnetic recording medium is described which has, on a non-magnetic support, a magnetic layer comprising a ferromagnetic substance dispersed in a binder, wherein the ferromagnetic substance is a hexagonal tabular ferromagnetic substance having an axis of easy magnetization in the direction perpendicular to the plain thereof and the ratio of the bulk density to true density (bulk densy/true density) is at least 0.16. The magnetic recording medium has improved output and C/N.
摘要翻译： 描述了一种磁性记录介质，其在非磁性载体上具有包含分散在粘合剂中的铁磁性物质的磁性层，其中该铁磁性物质是六方片状铁磁性物质，其具有在垂直于该载体的方向上易磁化的轴 其体积密度与真密度（体积密度/真密度）之比至少为0.16。 磁记录介质具有改善的输出和C / N。
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