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公开(公告)号：US5093192A
公开(公告)日：1992-03-03
申请号：US495384
申请日：1990-03-16
CPC分类号： G11B5/702 , G11B5/714 , G11B5/716 , Y10S428/90 , Y10T428/25 , Y10T428/257 , Y10T428/31609
摘要： A magnetic recording medium which has improved electromagnetic conversion characteristics and running ability and is suitable for high-density recording. The magnetic recording medium has at least two magnetic layers which are provided on one side of a support. One of said magnetic layers contains magnetic particles having an aspect ratio of from 3 to less than 8 and the other one contains magnetic particles having an aspect ration of from 8 to 12.
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公开(公告)号：US5089333A
公开(公告)日：1992-02-18
申请号：US621782
申请日：1990-12-04
CPC分类号： G11B5/708 , G11B5/716 , Y10S428/90 , Y10T428/257 , Y10T428/265 , Y10T428/30
摘要： A magnetic recording medium is disclosed, which has excellent electro-magnetic conversion characteristics and is improved in drop-out. The magnetic recording medium comprises a non-magnetic support and a plurality of magnetic layers provided on the support, and the magnetic layer being provided farthest from said support among these magnetic layers comprises a magnetic powder and a carbon black in an amount of not more than 1 part per 100 parts by weight of said magnetic powder; and another magnetic layer comprising a magnetic powder has a thickness of not more than 2.5 .mu.m, and 900 nm light-transmittance of said magnetic medium is not more than 0.1%.
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3.发明授权Magnetic recording medium containing a copolymer having an anionic functional group which forms an intermolecular salt 失效含有具有形成分子间盐的阴离子官能团的共聚物的磁记录介质
公开(公告)号：US5098785A
公开(公告)日：1992-03-24
申请号：US439800
申请日：1989-11-21
申请人： Takafumi Yanagita , Tsutomu Kempo , Narito Goto , Takuo Nishikawa , Noboru Koyama , Yasushi Nakano , Setsuko Kawahara
发明人： Takafumi Yanagita , Tsutomu Kempo , Narito Goto , Takuo Nishikawa , Noboru Koyama , Yasushi Nakano , Setsuko Kawahara
CPC分类号： C08G18/0833 , G11B5/7021 , G11B5/7023 , G11B5/718 , G11B5/738 , Y10S428/90 , Y10T428/26 , Y10T428/3158 , Y10T428/31609
摘要： A medium recording medium is provided which has a plurality of coated layers on a nonmagnetic base support, a least one of said coated layer containing a modified copolymer having introduced therein an anionic functional group which forms an intramolecular salt.
摘要翻译： 提供了一种介质记录介质，其在非磁性基体载体上具有多个涂覆层，所述涂层中至少一个含有引入了形成分子内盐的阴离子官能团的改性共聚物。
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公开(公告)号：US5026598A
公开(公告)日：1991-06-25
申请号：US448664
申请日：1989-12-11
CPC分类号： G11B5/716 , G11B5/708 , G11B5/714 , Y10S428/90 , Y10T428/25 , Y10T428/265 , Y10T428/30
摘要： There is disclosed a magnetic recording medium comprising a support and provided thereon a plurality of layers. The layers comprise an outermost magnetic layer and a lower magnetic layer, wherein the outermost magnetic layer contains carbon black having an average primary particle size ranging from 40 m.mu. to 300 m.mu., and the lower magnetic layer contains carbon black having an average primary particle size ranging from 5 m.mu. to 30 m.mu..
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公开(公告)号：US5097792A
公开(公告)日：1992-03-24
申请号：US490742
申请日：1990-03-08
申请人： Masahiro Umemura , Setsuko Kawahara , Takemasa Namiki , Seiichi Tobisawa , Shigetoshi Kawabe , Takeshi Nakajima , Yasushi Nakano , Noboru Koyama
发明人： Masahiro Umemura , Setsuko Kawahara , Takemasa Namiki , Seiichi Tobisawa , Shigetoshi Kawabe , Takeshi Nakajima , Yasushi Nakano , Noboru Koyama
CPC分类号： B05C9/06 , B05C5/0254 , G03C1/74 , G11B5/716 , G11B5/848 , G03C2001/7407 , G03C2001/7459 , G03C2001/7466
摘要： A coating apparatus having a first slot between its front and center edges and a second slot between its center and back edges, wherein a coating solution is extruded continuously from each of the slots onto the surface of a flexible support running continuously along the edge surfaces of the front, center, and back edges in that order.The front edge surface has a straight-line portion on at least the terminal end portion of the front edge so that the straight-line portion extends along the direction of movement of the support and is not longer than one mm, and at least one portion of the center and back edge surfaces protrudes from the extension line of the straight-line toward the support.The coating apparatus is suitable for preparing magnetic recording media.
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公开(公告)号：US5093193A
公开(公告)日：1992-03-03
申请号：US498327
申请日：1990-03-23
申请人： Noboru Koyama , Setsuko Kawahara , Yasushi Nakano
发明人： Noboru Koyama , Setsuko Kawahara , Yasushi Nakano
IPC分类号： G11B5/706 , C09D5/23 , C09D127/04 , C09D127/06 , C09D175/00 , C09D175/04 , G11B5/716 , G11B5/84 , G11B5/842
CPC分类号： G11B5/716 , Y10S428/90 , Y10T428/265
摘要： A magnetic recording medium and its manufacturing method are disclosed. The medium comprises a non-magnetic support and, provided thereon, a first magnetic layer coated by a first magnetic coating solution and a second magnetic layer coated by a second magnetic coating solution in this order, wherein a dry thickness of the first magnetic layer represented by .mu.m, t.sub.1, a dry thickness of the second magnetic layer represented by .mu.m, t.sub.2, the solid content of the first magnetic coating solution represented by weight %, W.sub.1, and the solid content of the second magnetic coating solution represented by weight %, W.sub.2 have the following relation,2.0.ltoreq.(t.sub.1 /W.sub.1) / (t.sub.2 /W.sub.2).ltoreq.15.0
摘要翻译： 公开了一种磁记录介质及其制造方法。 所述介质包括非磁性载体，并且在其上设置由第一磁性涂层溶液涂覆的第一磁性层和由第二磁性涂层溶液涂覆的第二磁性层，其中所述第一磁性层的干燥厚度表示为 以μm为单位，以μm为单位表示第二磁性层的干燥厚度，t2，以重量％表示的第一磁性涂层溶液的固体含量，W1和以重量计的第二磁性涂层溶液的固体含量 ％，W2具有以下关系：2.0
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公开(公告)号：US5151323A
公开(公告)日：1992-09-29
申请号：US588689
申请日：1990-09-28
申请人： Setsuko Kawahara , Yasushi Nakano , Noboru Koyama
发明人： Setsuko Kawahara , Yasushi Nakano , Noboru Koyama
IPC分类号： C09C1/48 , C09D5/23 , C09D7/12 , G11B5/708 , G11B5/716 , G11B5/73 , G11B5/735 , G11B5/84 , G11B5/842
CPC分类号： G11B5/716 , G11B5/708 , Y10S428/90 , Y10T428/25 , Y10T428/257 , Y10T428/30
摘要： A magnetic recording medium and manufacturing method thereof are disclosed. The recording medium comprisesa support,a plurality of magnetic layer being provided on a surface of the support, anda backcoat layer being provided on the other surface of the support and comprising a binder and a carbon black, whereinan outermost magnetic layer being provided at the outermost portion from the support among said plurality of magnetic layers comprises, a binder, a magnetic powder and a carbon black in which the weight ratio of the carbon black to the magnetic powder is 0.1 to 0.5 percent,a magnetic layer other than the outermost magnetic layer comprises a binder, a magnetic powder different from the magnetic powder contained in the outermost layer and a carbon black in which the weight ratio of the carbon black to the magnetic powder is zero to 0.4 percent.The plurality of magnetic layers are coated on the support under a condition of wet on wet.
摘要翻译： 公开了一种磁记录介质及其制造方法。 记录介质包括支撑体，多个磁性层设置在支撑体的表面上，背涂层设置在载体的另一个表面上，并且包括粘合剂和炭黑，其中提供最外层的磁性层 在所述多个磁性层的支撑体的最外侧部分包括粘合剂，磁性粉末和炭黑，其中炭黑与磁性粉末的重量比为0.1〜0.5％，除了 最外层的磁性层包括粘合剂，不同于最外层中所含的磁粉的磁性粉末和炭黑与磁粉的重量比为0〜0.4％的炭黑。 多个磁性层在湿润的条件下涂覆在载体上。
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公开(公告)号：US5051291A
公开(公告)日：1991-09-24
申请号：US464344
申请日：1990-01-12
申请人： Setsuko Kawahara , Yasushi Nakano , Noboru Koyama
发明人： Setsuko Kawahara , Yasushi Nakano , Noboru Koyama
IPC分类号： G11B5/716
CPC分类号： G11B5/716 , Y10S428/90 , Y10T428/24355 , Y10T428/25 , Y10T428/265
摘要： A magnetic recording medium is disclosed. The medium comprises a non-magnetic support and, provided thereon in order, a first magnetic layer and a second magnetic layer each containing a magnetic material and a binder. Rmax, a maximum roughness, and Ra, a center line average roughness, of a surface of the support on the magnetic layer side, d.sub.1, a thickness of the first magnetic layer, and d.sub.2, a thickness of the second magnetic layer, have the following relation,4.times.10.sup.-3 .ltoreq.Ra/d.sub.1 .ltoreq.1.8.times.10.sup.-24.times.10.sup.-2 .ltoreq.Rmax/d.sub.1 .ltoreq.4.5.times.10.sup.-1d.sub.2 .ltoreq.1.0 .mu.m
摘要翻译： 公开了一种磁记录介质。 介质包括非磁性支撑体，并且依次设置有分别含有磁性材料和粘合剂的第一磁性层和第二磁性层。 磁极层侧的载体表面的最大粗糙度Rmax，中心线平均粗糙度，d1，第一磁性层的厚度，d2，第二磁性层的厚度， 4×10 -3≤Ra/ d1×1.8×2-2-2×××××××××××R /
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公开(公告)号：US5336559A
公开(公告)日：1994-08-09
申请号：US931898
申请日：1992-08-18
CPC分类号： G11B5/738 , G11B5/842 , Y10T428/257 , Y10T428/265
摘要： A magnetic recording medium is disclosed which is excellent in the electro-magnetic conversion efficiency and inhibited drop-out. The magnetic recording medium cpomprises a non-magnetic support; a non-magnetic layer comprising a carbon black and a binder and being provided on the non-magnetic support; and a magnetic layer containing ferromagnetic metal particles comprising iron and aluminum or a magnetic layer containing tabular-shaped magnetic particles having an axis of easy magnetization with the direction perpendicular to the tabular surface, in which the magnetic layer is provided on the side of the non-magnetic layer farther fron the support by wet-on-wet coating procedure and has a dry thickness of from 0.3 .mu.m to 4.0 .mu.m.
摘要翻译： 公开了一种电磁转换效率优异且抑制脱落的磁记录介质。 磁记录介质采用非磁性支撑; 非磁性层，其包含炭黑和粘合剂，并且设置在所述非磁性载体上; 以及包含铁和铝的铁磁金属颗粒的磁性层或含有具有垂直于平板状表面的方向具有易磁化轴线的片状磁性颗粒的磁性层，其中磁性层设置在非磁性层的侧面上， 磁性层通过湿式湿法涂布方法进一步提供，并且具有0.3μm至4.0μm的干厚度。
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公开(公告)号：US5035856A
公开(公告)日：1991-07-30
申请号：US475131
申请日：1990-02-05
申请人： Noboru Koyama , Yasushi Nakano , Yoshitaka Yasufuku , Setsuko Kawahara , Takemasa Namiki , Shigetoshi Kawabe , Masahiro Umemura
发明人： Noboru Koyama , Yasushi Nakano , Yoshitaka Yasufuku , Setsuko Kawahara , Takemasa Namiki , Shigetoshi Kawabe , Masahiro Umemura
CPC分类号： G11B5/7085 , G11B5/716 , Y10S428/90 , Y10T428/256 , Y10T428/257
摘要： A magnetic recording medium having plural magnetic layers is disclosed. The uppermost magnetic layer contains an abrasive with an average particle diameter of not more than 0.3 .mu.m, and a magnetic layer other than the uppermost magnetic layer contains an abrasive with an average particle diameter of not less than 0.3 .mu.m. The medium is improved in the electromagnetic conversion characteristics and sliding noise.
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