公开(公告)号：US4343831A

公开(公告)日：1982-08-10

申请号：US243666

申请日：1981-03-13

申请人： Nobuo Tsuji ,  Goro Akashi ,  Masaaki Fujiyama ,  Yasuyuki Yamada

发明人： Nobuo Tsuji ,  Goro Akashi ,  Masaaki Fujiyama ,  Yasuyuki Yamada

IPC分类号： G11B5/70 ,  C09D5/23 ,  G11B5/702 ,  G11B5/842 ,  B05D3/06

CPC分类号： G11B5/842 ,  G11B5/7026

摘要： A process for producing a magnetic recording medium is described comprising applying to a support a coating solution which has ferromagnetic particles dispersed in a solution comprising a binder curable by electron beams and a low-boiling point solvent, irradiating the support with electron beam radiation while the particles remain dispersed uniformly, and evaporating the solvent to dryness.

摘要翻译： 一种磁记录介质的制造方法，其特征在于，在支撑体上涂布具有分散在由电子束和低沸点溶剂固化的粘合剂的溶液中的铁磁性粒子的涂布液， 颗粒保持均匀分散，蒸发溶剂至干。

公开(公告)号：US4391851A

公开(公告)日：1983-07-05

申请号：US353791

申请日：1982-03-02

申请人： Yasuyuki Yamada ,  Goro Akashi ,  Nobuo Tsuji ,  Yoshito Mukaida ,  Masaaki Fujiyama

发明人： Yasuyuki Yamada ,  Goro Akashi ,  Nobuo Tsuji ,  Yoshito Mukaida ,  Masaaki Fujiyama

IPC分类号： G11B5/842 ,  G11B5/702 ,  G11B5/84 ,  H01F10/02

CPC分类号： G11B5/84 ,  G11B5/7021

摘要： A process for producing a magnetic recording medium is disclosed. The process involves coating a non-magnetic base with magnetic coating solution containing fine ferromagnetic particles and a binder comprising nitrocellulose, polyol and an isocyanate having at least two isocyanato groups. In the process, the web having 0.3 to 3 wt % of the residual solvent in the magnetic layer is calendered, and the calendered web is then dried thoroughly.

摘要翻译： 公开了一种制造磁记录介质的方法。 该方法包括用含有细铁磁颗粒的磁性涂层溶液和包含硝化纤维素，多元醇和具有至少两个异氰酸酯基的异氰酸酯的粘合剂涂覆非磁性碱。 在该方法中，将磁性层中的残留溶剂的0.3〜3重量％的纤维网压延，然后将压延纤维网彻底干燥。

公开(公告)号：US4273797A

公开(公告)日：1981-06-16

申请号：US30538

申请日：1979-04-16

申请人： Goro Akashi ,  Yasuyuki Yamada ,  Masaaki Fujiyama ,  Nobutaka Yamaguchi

发明人： Goro Akashi ,  Yasuyuki Yamada ,  Masaaki Fujiyama ,  Nobutaka Yamaguchi

IPC分类号： C09D177/00 ,  C09D127/06 ,  C09D163/00 ,  G11B5/708 ,  G11B5/73 ,  G11B5/735 ,  B05D5/12

CPC分类号： G11B5/708 ,  G11B5/735

摘要： A magnetic recording medium comprising a plastic film support having a magnetic recording layer on one side is provided with a backing layer containing: (1) a white and/or light colored powder; (2) carbon black and/or graphite; and (3) a polymeric binder. The backing layer transmits more than 3% of white light at a thickness of 2 microns and has a surface electrical resistance of less than 10.sup.10 .OMEGA./cm. Pinholes and drop-out are easily detected in forming such a magnetic recording medium.

摘要翻译： 包括在一侧具有磁记录层的塑料膜载体的磁记录介质设置有背衬层，其包含：（1）白色和/或浅色粉末; （2）炭黑和/或石墨; 和（3）聚合物粘合剂。 背衬层以2微米的厚度透过超过3％的白光，其表面电阻小于1010欧米加/厘米。 在形成这种磁记录介质时容易检测出针孔和脱落。

公开(公告)号：US4135032A

公开(公告)日：1979-01-16

申请号：US835376

申请日：1977-09-21

申请人： Goro Akashi ,  Masaaki Fujiyama ,  Yasuyuki Yamada

发明人： Goro Akashi ,  Masaaki Fujiyama ,  Yasuyuki Yamada

IPC分类号： G11B5/70 ,  G11B5/735 ,  G11B5/78

CPC分类号： G11B5/70 ,  G11B5/735 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/256 ,  Y10T428/258 ,  Y10T428/265

摘要： A magnetic recording medium comprising a non-magnetizable plastic film support having a magnetic recording layer on one side thereof and, on the other side thereof, a layer containing (1) at least one powder of carbon black or graphite, and (2) at least one powder of a white pigment or a light colored pigment, and (3) a binder, powders (1) and (2) forming divided color areas in the back surface layer, and the back surface layer having a surface electrical resistance below 1 .times. 10.sup.10 ohm/cm.sup.2.

公开(公告)号：US4444838A

公开(公告)日：1984-04-24

申请号：US387129

申请日：1982-06-10

申请人： Yasuyuki Yamada ,  Goro Akashi ,  Nobuo Tsuji ,  Yoshito Mukaida

发明人： Yasuyuki Yamada ,  Goro Akashi ,  Nobuo Tsuji ,  Yoshito Mukaida

IPC分类号： C08G18/64 ,  C09D5/23 ,  G11B5/702 ,  G11B5/70

CPC分类号： C08G18/6484 ,  G11B5/7022 ,  Y10S428/90 ,  Y10T428/264 ,  Y10T428/265 ,  Y10T428/31609 ,  Y10T428/31826 ,  Y10T428/31931

摘要： A magnetic recording medium which comprises on a support base having coated thereon a magnetic layer containing a binder and a ferromagnetic fine powder dispersed in the binder is disclosed. The binder is comprised of a cellulose derivative having a residual OH group in a proportion of 7.5 to 40%, a diolefin or olefin series synthetic rubber and a polyisocyanate compound. The medium has excellent video sensitivity and video signal to noise ratio. The medium of the invention also have improved abrasion resistance.

摘要翻译： 公开了一种磁记录介质，其包括在其上涂覆有包含粘合剂的磁性层的支撑基底和分散在粘合剂中的铁磁细粉末。 粘合剂由具有7.5〜40％的残留OH基的纤维素衍生物，二烯烃或烯烃系合成橡胶和多异氰酸酯化合物构成。 该介质具有出色的视频灵敏度和视频信噪比。 本发明的介质也具有改善的耐磨性。

公开(公告)号：US4439486A

公开(公告)日：1984-03-27

申请号：US357448

申请日：1982-03-12

申请人： Yasuyuki Yamada ,  Masaaki Fujiyama ,  Nobuo Tsuji

发明人： Yasuyuki Yamada ,  Masaaki Fujiyama ,  Nobuo Tsuji

IPC分类号： C09D5/23 ,  G11B5/702 ,  G11B5/706 ,  G11B5/714 ,  G11B5/70

CPC分类号： G11B5/7022 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265 ,  Y10T428/31609 ,  Y10T428/31703

摘要： A magnetic recording medium having a magnetic layer formed on a nonmagnetic base is disclosed. The magnetic layer comprises ferromagnetic particles having a specific surface area of 30 m.sup.2 /g or more. The particles are dispersed in a binder which comprises a thermoplastic polyurethane resin or polyurethane prepolymer and nitrocellulose having an average degree of polymerization of about 50 to 300 and a degree of nitration of 10.7 to 13.0.

摘要翻译： 公开了一种具有形成在非磁性基底上的磁性层的磁记录介质。 磁性层包含比表面积为30m 2 / g以上的铁磁性粒子。 将颗粒分散在包含热塑性聚氨酯树脂或聚氨酯预聚物和平均聚合度为约50至300且硝化度为10.7至13.0的硝酸纤维素的粘合剂中。

公开(公告)号：US4588656A

公开(公告)日：1986-05-13

申请号：US352462

申请日：1982-02-25

申请人： Tatsuji Kitamoto ,  Ryuji Shirahata ,  Yasuyuki Yamada ,  Goro Akashi

发明人： Tatsuji Kitamoto ,  Ryuji Shirahata ,  Yasuyuki Yamada ,  Goro Akashi

IPC分类号： G11B5/66 ,  C10M107/38 ,  C10N40/18 ,  G11B5/64 ,  G11B5/65 ,  G11B5/702 ,  G11B5/71 ,  G11B5/72 ,  G11B5/725 ,  G11B5/85 ,  G11B5/851

CPC分类号： G11B5/64 ,  G11B5/702 ,  G11B5/71 ,  G11B5/851 ,  Y10S428/90

摘要： A magnetic recording medium comprising a substrate, a thin magnetic metal film having spaced-apart columnar grains deposited on the substrate, and an organic polymer formed in the space between the columnar grains and integrated therewith. The medium is prepared by impregnating the spaces between the columnar grains with organic monomers or oligomers and polymerizing them in the spaces.

摘要翻译： 一种磁记录介质，包括基板，沉积在基板上的具有间隔开的柱状晶粒的薄磁金属膜，以及形成在柱状晶粒之间的空间中并与之成一体的有机聚合物。 介质通过将柱状颗粒之间的空间用有机单体或低聚物浸渍并在空间中聚合来制备。

公开(公告)号：US4015030A

公开(公告)日：1977-03-29

申请号：US591681

申请日：1975-06-30

申请人： Koji Sasazawa ,  Yasuyuki Yamada ,  Tatsuji Kitamoto ,  Goro Akashi

发明人： Koji Sasazawa ,  Yasuyuki Yamada ,  Tatsuji Kitamoto ,  Goro Akashi

IPC分类号： H01F1/11 ,  C09D5/23 ,  C09D7/12 ,  G11B5/62 ,  G11B5/706 ,  H01F10/02

CPC分类号： G11B5/70694

摘要： A process for stabilizing a ferromagnetic material comprising heat-treating a needle-like ferromagnetic material represented by the formula MO.sub.x wherein M is a ferromagnetic metal ion or a ferromagnetic non-metal ion and another metal ion, and x is the degree of oxidation which ranges from 1.36 to 1.47, and containing at least 0.5 atom % Co, at a temperature of at least about 40.degree. C, and a process for stabilizing a magnetic recording member comprising heat-treating a magnetic recording member produced by providing a ferromagnetic recording layer comprising (a) a ferromagnetic material represented by the formula MO.sub.x wherein M and x are the same as defined above, and containing at least 0.5 atom % Co, and (b) a binder, on a support, at a temperature of at least about 40.degree. C.

摘要翻译： 一种用于稳定铁磁材料的方法，包括热处理由式MOx表示的针状铁磁材料，其中M是铁磁金属离子或铁磁性非金属离子和另一种金属离子，x是氧化程度 1.36至1.47，并且在至少约40℃的温度下含有至少0.5原子％的Co，以及用于稳定磁性记录元件的方法，该方法包括热处理通过提供铁磁性记录层产生的磁性记录元件，所述磁性记录元件包括 （a）由式MOx表示的铁磁材料，其中M和x与上述定义相同，并且在载体上至少包含至少约40的温度下含有至少0.5原子％的Co和（b）粘合剂 DEG C.

公开(公告)号：US4076890A

公开(公告)日：1978-02-28

申请号：US403351

申请日：1973-10-04

申请人： Yasuyuki Yamada ,  Goro Akashi ,  Hiroshi Ogawa

发明人： Yasuyuki Yamada ,  Goro Akashi ,  Hiroshi Ogawa

IPC分类号： G11B5/708 ,  C09C3/12 ,  C09D5/23 ,  C09D7/12 ,  G11B5/02 ,  G11B5/712 ,  H01F10/02

CPC分类号： G11B5/712 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/254 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/258 ,  Y10T428/259 ,  Y10T428/266 ,  Y10T428/2995

摘要： A magnetic recording medium comprising a support having thereon a magnetizable recording layer containing a ferromagnetic powder dispersed in a binder, said magnetizable recording layer containing a silane coupling agent.

摘要翻译： 一种磁记录介质，包括其上具有分散在粘合剂中的铁磁性粉末的可磁化记录层的载体，所述可磁化记录层含有硅烷偶联剂。

公开(公告)号：US4368237A

公开(公告)日：1983-01-11

申请号：US38620

申请日：1979-05-14

申请人： Yasuyuki Yamada ,  Tatsuji Kitamoto ,  Goro Akashi

发明人： Yasuyuki Yamada ,  Tatsuji Kitamoto ,  Goro Akashi

IPC分类号： C09D5/23 ,  G11B5/702 ,  G11B5/842 ,  H01F10/02

CPC分类号： G11B5/7022 ,  Y10S428/90 ,  Y10T428/31511 ,  Y10T428/31609 ,  Y10T428/31725 ,  Y10T428/31935

摘要： A magnetic recording material having superior abrasion resistance and thermal stability is produced by coating a magnetic coating composition consisting essentially of aqueous emulsions of at least two resin binders capable of reacting with each other upon mixing, and being present therein in the separated state, and a ferromagnetic powder on a non-magnetic support, drying the coating, and curing the resulting magnetic recording layer where drying is insufficient to effect curing. Hazards ascribable to the use of organic solvents in conventional techniques can be obviated by this invention.

摘要翻译： 具有优异的耐磨性和热稳定性的磁记录材料通过涂覆基本上由至少两种混合后能够彼此反应并且以分离状态存在的树脂粘合剂的水乳液组成的磁性涂料组合物， 铁磁粉末在非磁性载体上，干燥涂层，并固化所得到的磁记录层，其中干燥不足以实现固化。 本发明可以避免归因于常规技术中使用有机溶剂的危害。