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公开(公告)号：US4267207A
公开(公告)日：1981-05-12
申请号：US39028
申请日：1979-05-14
CPC分类号： G11B5/70694 , C01G49/02 , G11B5/70642 , C01P2006/42
摘要： A process for producing a cobalt-containing ferromagnetic iron oxide powder suitable for magnetic recording which comprises(a) mixing cobalt ion, ferrous ion and an alkali with an aqueous dispersion of acicular ferromagnetic iron oxide nuclei under non-oxidizing conditions at a temperature of about 50.degree. C. or less;(b) heating the dispersion to a temperature of at least about 60.degree. C. but below the boiling point of the dispersion under non-oxidizing conditions to cause a reaction; and(c) treating the dispersion at a temperature of at least about 60.degree. C. but below the boiling point of the dispersion under the following conditions:(1) initially treating the dispersion under non-oxidizing conditions for about 5 minutes or more;(2) subsequentially treating the dispersion under oxidizing conditions for about 5 minutes or more prior to the termination of the reaction; and(3) a total treating time under non-oxidizing conditions and oxidizing conditions of at least about 30 minutes.
摘要翻译： 一种适用于磁记录的含钴铁磁性氧化铁粉末的制造方法，其特征在于，包括：（a）在非氧化条件下，将钴离子，亚铁离子和碱与针状铁磁性氧化铁核的水分散体混合， 50℃以下; （b）在非氧化条件下将分散体加热到至少约60℃但低于分散体的沸点以引起反应; 和（c）在以下条件下，在至少约60℃但低于分散体沸点的温度下处理分散体：（1）最初在非氧化条件下处理分散体约5分钟或更长时间; （2）在反应终止之前，在氧化条件下将分散体顺序处理约5分钟或更长时间; 和（3）在非氧化条件和氧化条件下的总处理时间为至少约30分钟。
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公开(公告)号：US4260466A
公开(公告)日：1981-04-07
申请号：US771583
申请日：1977-02-24
CPC分类号： G11B5/8416 , C23C14/06 , G11B5/851 , Y10S428/90 , Y10T428/31721
摘要： A method of producing a magnetic recording layer on a support comprising simultaneously depositing a ferromagnetic material and a polymer on a support using a vapor deposition technique such as vacuum deposition, sputtering, etc., thereby to produce thereon a magnetic recording layer of a composite film of the ferromagnetic material and the polymer. A further embodiment for producing a magnetic recording layer comprises simultaneously depositing a ferromagnetic material and a monomer or oligomer on the support using a vapor deposition technique, polymerizing the deposited layer, e.g., using a polymerization catalyst or by applying ionizing or electromagnetic rays thereto, to form a composite film of the ferromagnetic material and the polymer. The magnetic recording layer thus obtained in either embodiment can be used for high density recording.
摘要翻译： 一种在支撑体上制造磁记录层的方法，包括使用诸如真空沉积，溅射等的气相沉积技术在载体上同时沉积铁磁材料和聚合物，从而在其上制备复合膜的磁记录层 的铁磁材料和聚合物。 用于制造磁记录层的另一实施例包括使用气相沉积技术同时在支撑体上沉积铁磁材料和单体或低聚物，使沉积层聚合，例如使用聚合催化剂或通过向其施加电离或电磁辐射至 形成铁磁材料和聚合物的复合膜。 这样获得的磁记录层可用于高密度记录。
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公开(公告)号：US4666773A
公开(公告)日：1987-05-19
申请号：US585023
申请日：1984-03-05
申请人： Tatsuji Kitamoto , Goro Akashi
发明人： Tatsuji Kitamoto , Goro Akashi
CPC分类号： G11B5/70 , G11B5/845 , G11B5/852 , Y10S428/90 , Y10T428/26 , Y10T428/31678
摘要： In a magnetic recording medium comprising a non-magnetic support and a magnetic recording layer coated thereon in which ferromagnetic particles are dispersed in a binder, the ferromagnetic particles are given a magnetic anisotropy by a magnetic annealing treatment and the direction of the magnetic anisotropy is vertical mainly to the recording surface. Thus, the vertical magnetization recording is improved.
摘要翻译： 在包含非磁性载体和涂覆有磁性体的磁记录层的磁记录介质中，铁磁颗粒分散在粘合剂中，铁磁颗粒通过磁性退火处理被赋予磁各向异性，并且磁各向异性方向垂直 主要是记录面。 因此，提高了垂直磁化记录。
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公开(公告)号：US4520069A
公开(公告)日：1985-05-28
申请号：US375691
申请日：1982-05-06
申请人： Tatsuji Kitamoto , Goro Akashi
发明人： Tatsuji Kitamoto , Goro Akashi
CPC分类号： G11B5/714 , G11B5/845 , G11B5/852 , Y10S428/90 , Y10T428/256 , Y10T428/257 , Y10T428/265
摘要： In a magnetic recording medium comprising a non-magnetic support and a magnetic recording layer coated thereon in which ferromagnetic particles are dispersed in a non-magnetic binder, an improvement consists in that the ferromagnetic particles have a mean particle length of at most 0.3 microns with a length to width ratio of more than 1 but at most 3 and optionally are subjected to an orientation treatment in a magnetic field in the vertical direction to the recording surface.
摘要翻译： 在包含非磁性载体和涂覆有磁性颗粒的非磁性粘结剂中的磁记录层的磁记录介质中，其改进在于，铁磁性颗粒的平均颗粒长度至多为0.3微米， 长宽比大于1但大于3，并且任选地在与记录表面垂直的方向上的磁场中进行取向处理。
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公开(公告)号：US4588656A
公开(公告)日：1986-05-13
申请号：US352462
申请日：1982-02-25
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。
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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：US4515857A
公开(公告)日：1985-05-07
申请号：US375690
申请日：1982-05-06
申请人： Tatsuji Kitamoto , Goro Akashi
发明人： Tatsuji Kitamoto , Goro Akashi
CPC分类号： G11B5/852 , G11B5/70642 , G11B5/714 , G11B5/845 , Y10S428/90 , Y10T428/256 , Y10T428/257 , Y10T428/265
摘要： In a magnetic recording medium comprising a non-magnetic support and a magnetic recording layer coated thereon in which ferromagnetic particles are dispersed in a non-magnetic binder, the ferromagnetic particles are cubic particles of 0.3 or less micron and are subjected to an orientation treatment in the vertical direction to the recording surface, whereby the output and S/N ratio in a high density recording are increased.
摘要翻译： 在包含非磁性载体和涂覆有磁性颗粒的磁记录层的磁记录介质中，铁磁颗粒分散在非磁性粘结剂中，铁磁性颗粒是0.3微米或更小微米的立方颗粒，并进行取向处理 到记录表面的垂直方向，从而增加了高密度记录中的输出和S / N比。
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公开(公告)号：US4482578A
公开(公告)日：1984-11-13
申请号：US505509
申请日：1983-06-17
申请人： Goro Akashi , Tatsuji Kitamoto , Tsutomu Okita
发明人： Goro Akashi , Tatsuji Kitamoto , Tsutomu Okita
IPC分类号： G11B5/702 , C09D5/23 , C09D101/00 , C09D101/08 , C09D133/04 , C09D175/00 , G11B5/70 , G11B5/714 , G11B5/842 , G11B5/845 , B05D3/06
摘要： A method for preparing a magnetic recording medium comprising a non-magnetic support having coated thereon a magnetic layer containing plate-shaped ferromagnetic fine particles oriented perpendicular to a plane of the surface of the support, the process comprising the steps of:coating the non-magnetic support with a coating composition wherein ferromagnetic fine particles are dispersed in a solution comprised of a compound polymerizable by radiation with electron beams and a solvent, said particles being plate-shaped and having an axis of easy magnetization perpendicular to a plane of the plate-shaped particles;orienting the ferromagnetic fine particles perpendicular to the surface of support while the coating composition is undried;radiating the composition with electron beams; anddrying the composition by removing the solvent.
摘要翻译： 一种制备磁性记录介质的方法，包括其上涂覆有包含垂直于所述载体表面的平面定向的板状铁磁细颗粒的磁性层的非磁性载体，所述方法包括以下步骤： 具有涂层组合物的磁性载体，其中铁磁细颗粒分散在由通过辐射与电子束和溶剂聚合的化合物组成的溶液中，所述颗粒是板形的并且具有垂直于板状平面的平滑的磁化轴线， 形状颗粒; 在涂料组合物未干燥的同时使铁磁细颗粒垂直于载体表面定向; 用电子束辐射组合物; 并通过除去溶剂干燥组合物。
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公开(公告)号：US4442159A
公开(公告)日：1984-04-10
申请号：US382336
申请日：1982-05-26
CPC分类号： G11B5/716 , Y10S428/90 , Y10T428/24942 , Y10T428/256 , Y10T428/257 , Y10T428/265
摘要： A magnetic recording medium which comprises a non-magnetic support having thereon two or more magnetic layers comprising magnetic particles in a binder. The magnetic layer(s) other than the topmost layer comprises needle-shaped magnetic particles. The topmost layer comprises plate-shaped magnetic particles which have axes of easy magnetization perpendicular to the individual plate planes and the plate planes are oriented substantially parallel to the surface of the magnetic layer.
摘要翻译： 一种磁记录介质，其包括其上具有两个或更多个包含粘合剂中的磁性颗粒的磁性层的非磁性载体。 除了最上层之外的磁性层包括针状磁性颗粒。 最顶层包括板状磁性颗粒，其具有垂直于各个板平面的易磁化的轴，并且板平面基本上平行于磁性层的表面取向。
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公开(公告)号：US4414270A
公开(公告)日：1983-11-08
申请号：US345121
申请日：1982-02-02
IPC分类号： G11B5/70 , C09D5/23 , C09D7/12 , C10M171/00 , C10N40/18 , G11B5/708 , G11B5/73 , G11B5/735 , B32B5/16
CPC分类号： G11B5/7085 , G11B5/735 , Y10S428/90 , Y10T428/252 , Y10T428/256 , Y10T428/257 , Y10T428/258 , Y10T428/259 , Y10T428/265
摘要： A magnetic recording medium comprising a magnetic layer on one surface of a non-magnetic base and a back coating on the other surface thereof which is not thicker than 2.mu. and which contains inorganic particles and a binder is disclosed. The inorganic particles have an average size between 0.02 and 5.mu. and a Mohs hardness of 2.5 to 9.0, and the surface of the back coating has a center line average roughness (Ra) of 0.024 or less and the surface of the magnetic layer has a center line average roughness (Ra) of 0.02.
摘要翻译： 公开了一种磁记录介质，其包括在非磁性基底的一个表面上的磁性层和在另一个表面上的不超过2微米并且含有无机颗粒和粘合剂的背涂层。 无机粒子的平均粒径为0.02〜5μm，莫氏硬度为2.5〜9.0，背面的表面的中心线平均粗糙度（Ra）为0.024以下，磁性层的表面为 中心线平均粗糙度（Ra）为0.02。
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