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公开(公告)号：US4812330A
公开(公告)日：1989-03-14
申请号：US188942
申请日：1988-05-02
申请人： Tadashi Ishikuro , Masaaki Fujiyama
发明人： Tadashi Ishikuro , Masaaki Fujiyama
CPC分类号： G11B5/7023 , G11B5/7021 , G11B5/708 , Y10S428/90
摘要： A process for producing a magnetic recording medium is disclosed, which comprises uniformly dispersing an .alpha.-Al.sub.2 O.sub.3 powder having a particle size of not greater than 0.1 .mu.m in a dispersion medium to obtain a dispersion, adding the dispersion to a coating composition for a magnetic layer essentially comprising a binder and a ferromagnetic powder having a specific surface area of not less than about 40 m.sup.2 /g, further dispersing the mixture to prepare a coating composition for a magnetic layer, and coating the resulting coating composition on a nonmagnetic support to obtain a magnetic layer having a dry thickness of about 2 .mu.m or less. The resulting magnetic recording medium exhibits excellent electromagnetic characteristics and improved abrasion resistance.
摘要翻译： 公开了一种制造磁记录介质的方法，其包括在分散介质中均匀分散粒径不大于0.1μm的α-Al2O3粉末以获得分散体，将该分散体加入用于磁性的涂料组合物 层，基本上包含粘合剂和比表面积不小于约40m 2 / g的铁磁性粉末，进一步分散混合物以制备用于磁性层的涂料组合物，并将所得涂料组合物涂布在非磁性载体上以获得 具有约2μm或更小干燥厚度的磁性层。 所得的磁记录介质表现出优异的电磁特性和改进的耐磨性。
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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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公开(公告)号：US4689265A
公开(公告)日：1987-08-25
申请号：US792896
申请日：1985-10-30
申请人： Takahito Miyoshi , Masaaki Fujiyama
发明人： Takahito Miyoshi , Masaaki Fujiyama
CPC分类号： G11B5/708 , G11B5/714 , Y10S428/90 , Y10T428/25 , Y10T428/256 , Y10T428/257
摘要： A magnetic recording medium comprising a nonmagnetic support and a magnetic recording layer provided on said support, said magnetic recording layer comprising a ferromagnetic powder dispersed in a binder, characterized in that said magnetic recording layer contains an inorganic plate powder having the maximum diameter of not larger than 1.0 .mu.m and a thickness of not larger than 0.1 .mu.m.
摘要翻译： 一种包含非磁性载体和设置在所述载体上的磁记录层的磁记录介质，所述磁记录层包含分散在粘合剂中的铁磁性粉末，其特征在于，所述磁记录层含有最大直径不大的无机板粉末 大于1.0μm，厚度不大于0.1μm。
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公开(公告)号：US4657813A
公开(公告)日：1987-04-14
申请号：US714282
申请日：1985-03-21
申请人： Takamitsu Asai , Masaaki Fujiyama
发明人： Takamitsu Asai , Masaaki Fujiyama
CPC分类号： G11B5/714 , G11B5/70673 , 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 magnetic particles and a binder, wherein the magnetic particles comprise (1) ferromagnetic hexagonal crystallized tabular shape particles having an axis of easy magnetization in a direction vertical to the tabular plane thereof and (2) ferromagnetic ellipsoidal particles having an acicular ratio (length/width) of 1.5/1 to 10/1 and having a saturation magnetization of 60 emu/g 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包含磁性颗粒和粘合剂的磁性层的非磁性载体，其中所述磁性颗粒包括（1）在垂直方向上具有容易磁化轴的铁磁六方晶系结晶的平板状颗粒 （2）具有1.5 / 1〜10/1的针状比（长/宽），饱和磁化强度为60emu / g以上的铁磁性椭圆体颗粒。
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公开(公告)号：US4656088A
公开(公告)日：1987-04-07
申请号：US768608
申请日：1985-08-23
CPC分类号： G11B5/708 , Y10S428/90 , Y10T428/25 , Y10T428/256 , Y10T428/257 , Y10T428/258
摘要： A magnetic recording medium is disclosed. The medium comprises a non-magnetic support having provided thereon a magnetic layer comprising a binder, a magnetic powder and a powder of an oxide represented by the formula:M-1.multidot.M-2.multidot.O.sub.2+xwherein M-1 is at least one of barium, strontium, lead and calcium; M-2 is at least one member of titanium, zirconium and tin; and x represents a number of from 0 to 0.9. The medium has a high S/N ratio and improved wear resistance and causes only moderate wear of a magnetic head.
摘要翻译： 公开了一种磁记录介质。 介质包括非磁性载体，其上设置有包含粘合剂，磁性粉末和由下式表示的氧化物粉末的磁性层：M-1×2M-2xO2 + x，其中M-1是钡， 锶，铅和钙; M-2是钛，锆和锡中的至少一种; x表示0〜0.9的数。 该介质具有高的S / N比和改进的耐磨性，并且仅导致磁头的适度的磨损。
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公开(公告)号：US4650720A
公开(公告)日：1987-03-17
申请号：US599116
申请日：1984-04-11
申请人： Nobutaka Yamaguchi , Takahito Miyoshi , Toshimitu Okutu , Noburo Hibino , Eiichi Tadokoro , Masaaki Fujiyama
发明人： Nobutaka Yamaguchi , Takahito Miyoshi , Toshimitu Okutu , Noburo Hibino , Eiichi Tadokoro , Masaaki Fujiyama
IPC分类号： G11B5/78 , C09D5/23 , C09D7/12 , C10M105/22 , C10N40/18 , G11B5/706 , G11B5/71 , G11B5/73 , G11B5/735 , G11B5/62
CPC分类号： G11B5/735 , G11B5/71 , Y10S428/90 , Y10T428/31786
摘要： A magnetic recording medium is disclosed which comprises a non-magnetic support having provided thereon a magnetic recording layer and a backing layer on the opposite surface thereof, wherein said magnetic recording layer contains a fatty acid, said backing layer contains a cellulose resin, and said non-magnetic support has a Young's modulus of 7.times.10.sup.10 to 1.times.10.sup.13 dyn/cm.sup.2.
摘要翻译： 公开了一种磁记录介质，其包括在其相对表面上设置有磁记录层和背衬层的非磁性载体，其中所述磁记录层含有脂肪酸，所述背层含有纤维素树脂，并且所述 非磁性载体的杨氏模量为7×10 10〜1×10 13 dyn / cm 2。
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公开(公告)号：US4617226A
公开(公告)日：1986-10-14
申请号：US642911
申请日：1984-08-21
IPC分类号： C09D169/00 , C09D167/02 , G11B5/73 , G11B5/738 , G11B5/72
CPC分类号： G11B5/738 , Y10S428/90 , Y10T428/24975 , Y10T428/25 , Y10T428/265 , Y10T428/30 , Y10T428/31504
摘要： A novel magnetic recording medium comprising a non-magnetic support, a magnetic recording layer, and an intermediate layer containing an electroconductive polymer. An optional second intermediate layer contains carbon black and is provided on either surface of the first intermediate layer. The magnetic recording medium has low surface electric resistance, and when used as a video tape, has both a high video S/N ratio and improved stability of video S/N with the passage of time.
摘要翻译： 一种包含非磁性载体，磁记录层和含有导电聚合物的中间层的新型磁记录介质。 可选的第二中间层包含炭黑并且设置在第一中间层的任一表面上。 磁记录介质具有低表面电阻，并且当用作录像带时，随着时间的推移具有高视频S / N比和视频S / N的改进的稳定性。
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公开(公告)号：US4612235A
公开(公告)日：1986-09-16
申请号：US715757
申请日：1985-03-25
IPC分类号： C09D101/18 , C09D175/04 , G11B5/72 , G11B5/73 , G11B5/735
CPC分类号： G11B5/735 , G11B5/72 , Y10S428/90 , Y10T428/24975 , Y10T428/25 , Y10T428/256 , Y10T428/257 , Y10T428/258 , Y10T428/259
摘要： This invention relates to a magnetic recording medium whose coefficient of friction is lowered without lowering S/N and which has an improved running property, which comprises a magnetic recording layer on one side of a nonmagnetic support and a back layer containing an inorganic powder and a binder and having a thickness of at most 2.mu., on the other side thereof, characterized in that the surface of the back layer is provided with surface projections with a height of 0.05 to 0.8.mu., an interval of at least 50.mu. and 50 to 50,000 projections/cm.sup.2.
摘要翻译： 本发明涉及一种磁记录介质，其摩擦系数降低而不降低S / N，并且具有改善的运行性能，其包括在非磁性载体的一侧上的磁记录层和含有无机粉末和 粘合剂，其厚度至多为2μm，其特征在于，背层的表面设置有高度为0.05至0.8μm的表面突起，间隔至少为50μm至50至 50,000个投影/ cm2。
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公开(公告)号：US4569856A
公开(公告)日：1986-02-11
申请号：US709859
申请日：1985-03-08
申请人： Takahito Miyoshi , Kenichi Masuyama , Shin-ichiro Dezawa , Toshimitu Okutu , Norio Nasu , Nobuo Aoki , Masaaki Fujiyama
发明人： Takahito Miyoshi , Kenichi Masuyama , Shin-ichiro Dezawa , Toshimitu Okutu , Norio Nasu , Nobuo Aoki , Masaaki Fujiyama
CPC分类号： G11B5/70 , G11B5/706 , G11B5/714 , Y10S428/90
摘要： A method for preparing a magnetic recording medium is described, comprising (1) pre-dispersing ferromagnetic particles having an S.sub.BET specific surface area of 35 m.sup.2 /g or more and having an adjusted water content of 0.8 wt % or more with a binder, (2) adding an additional binder and a lubricating agent thereinto, mixing and dispersing them to prepare a diserpsion of a magnetic coating composition, and (3) coating the resulting dispersion of a magnetic coating composition on a non-magnetic support.
摘要翻译： 描述了制备磁记录介质的方法，其包括：（1）用粘合剂将SBET比表面积为35m 2 / g以上并具有0.8重量％以上调节水含量的铁磁粒子预分散， 2）向其中加入附加的粘合剂和润滑剂，混合并分散它们以制备磁性涂料组合物的分解，和（3）将得到的磁性涂料组合物的分散体涂布在非磁性载体上。
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公开(公告)号：US4567057A
公开(公告)日：1986-01-28
申请号：US654549
申请日：1984-09-26
申请人： Kenichi Masuyama , Toshimitu Okutu , Takahito Miyoshi , Hiroshi Ogawa , Masahiro Utumi , Masaaki Fujiyama , Sugihiko Tada
发明人： Kenichi Masuyama , Toshimitu Okutu , Takahito Miyoshi , Hiroshi Ogawa , Masahiro Utumi , Masaaki Fujiyama , Sugihiko Tada
CPC分类号： G11B5/845
摘要： A magnetic coating composition comprising a binder dissolved in a solvent and magnetic grains dispersed therein is applied onto a surface of a non-magnetic substrate continuously moved. The coating film thus overlaid on the non-magnetic substrate is subjected to a preliminary orientation step for orientating the magnetic grains in the coating film, and then to a preliminary drying step. A final orientation step is then conducted while intermediate drying is carried out. Thereafter, final drying is effected.
摘要翻译： 将包含溶解在溶剂中的粘合剂和分散在其中的磁性颗粒的磁性涂料组合物施加到连续移动的非磁性基材的表面上。 由此覆盖在非磁性基板上的涂膜进行用于使涂覆膜中的磁性颗粒定向的初步取向步骤，然后进行预干燥步骤。 然后在进行中间干燥的同时进行最终取向步骤。 此后，进行最终干燥。
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