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公开(公告)号：US4581251A
公开(公告)日：1986-04-08
申请号：US625759
申请日：1984-06-28
CPC分类号： G11B5/70673
摘要： A process for preparing cobalt-modified ferromagnetic iron oxide by modifying ferromagnetic .gamma.-Fe.sub.2 O.sub.3 particles with cobalt, wherein prior to cobalt modification treatment, the ferromagnetic .gamma.-Fe.sub.2 O.sub.3 is heat treated at a temperature in the range of from about -200.degree. C. to +30.degree. C. of the critical temperature at which partial transition of .gamma.-Fe.sub.2 O.sub.3 into .alpha.-Fe.sub.2 O.sub.3 occurs and which reduces the saturation magnetization to 99% of the saturation magnetization measured before the heat treatment, and the atomic ratio of Fe.sup.++ /Fe.sup.+++ after the cobalt modification is 0.00 to 0.10.
摘要翻译： 通过用钴改性铁磁性γ-Fe2O3颗粒来制备钴改性的铁磁性氧化铁的方法，其中在钴改性处理之前，将铁磁性γ-Fe 2 O 3在约-200℃至 发生γ-Fe2O3向α-Fe2O3发生部分转变的临界温度+30℃，并且将饱和磁化强度降低到热处理前测量的饱和磁化强度的99％，Fe ++ / Fe +++之后的原子比 钴改性为0.00〜0.10。
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公开(公告)号：US4486496A
公开(公告)日：1984-12-04
申请号：US382337
申请日：1982-05-26
IPC分类号： G11B5/70 , C09D5/23 , C09D7/12 , G11B5/02 , G11B5/706 , G11B5/714 , H01F1/11 , G11B5/68 , B32B5/16
CPC分类号： G11B5/706 , G11B5/714 , G11B5/02 , Y10S428/90 , Y10T428/256 , Y10T428/257
摘要： A magnetic recording medium which comprises a non-magnetic support having thereon a magnetic layer containing plate-shaped magnetic particles which have axes of easy magnetization perpendicular to their respective plate planes dispersed in a binder, the magnetic particles each having a multiple magnetic domain structure and having a particle diameter equal to or longer than the recorded effective shortest wavelength.
摘要翻译： 一种磁记录媒体，其特征在于，具有非磁性支持体，上述磁性层含有板状磁性粒子，所述磁性粒子具有易分散在粘合剂中的各自平板平面的磁化强度的方向，所述磁性粒子各自具有多个磁畴结构， 具有等于或大于所记录的有效最短波长的粒径。
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公开(公告)号：US4069164A
公开(公告)日：1978-01-17
申请号：US701914
申请日：1976-07-01
IPC分类号： C01G49/00 , C01G49/02 , C01G49/06 , C01G49/08 , C09D5/23 , C09D7/12 , G11B5/706 , H01F1/11 , G11B5/64
CPC分类号： G11B5/70689 , C01G49/06 , C01G49/08 , G11B5/70673 , C01P2006/42
摘要： In a process for producing ferromagnetic powder which comprises adding an aqueous solution containing Co.sup.+2 ions, with or without another cation or cations, and an alkali solution to a suspension of ferromagnetic iron oxide, and heating the mixture to produce ferromagnetic iron oxide containing the metal provided by such an ion (s), the improvement wherein the heating is carried out in the presence of an oxidizing agent.
摘要翻译： 在制备铁磁性粉末的方法中，该方法包括将含有Co +2离子的水溶液（含有或不含有其它阳离子或阳离子）和碱溶液加入到铁磁性氧化铁悬浮液中，并加热混合物以产生含铁 由这样的离子提供的金属，其中加热在氧化剂存在下进行。
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公开(公告)号：US4066565A
公开(公告)日：1978-01-03
申请号：US702172
申请日：1976-07-02
CPC分类号： G11B5/70673 , C01G49/06 , G11B5/70642 , C01P2006/42
摘要： Co- and Fe-containing ferromagnetic iron oxide powder having a high coercive force and improved stability to heat and pressure is produced by adding an aqueous alkali solution, an aqueous solution containing Co.sup.+2 ions, and an aqueous solution containing not more than 1 equivalent, based on the Co.sup.+2 ions, of Fe.sup.+3 ions to a suspension of a ferromagnetic iron oxide, and heating the mixture at a temperature of at least about 80.degree. C, preferably 90.degree. to 105.degree. C. The ferromagnetic iron oxide powder is especially suitable for producing magnetic recording media.
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5.发明授权Process for producing ferrogmagnetic iron oxide powder comprising a pre-treatment with a reducing agent 失效包含用还原剂进行预处理的铁磁性氧化铁粉末的制造方法
公开(公告)号：US4125474A
公开(公告)日：1978-11-14
申请号：US710813
申请日：1976-08-02
CPC分类号： G11B5/70673 , G11B5/70642
摘要： In a process for producing a ferromagnetic powder having a high coercive force which comprises adding an aqueous solution containing Co.sup.+2 ions, or both Co.sup.+2 ions and another cation(s), and an alkali solution to a suspension of a ferromagnetic iron oxide containing the metal(s) given by these ion(s), the improvement wherein said ferromagnetic iron oxide is treated with a reducing agent prior to the preparation of the suspension.
摘要翻译： 在制备具有高矫顽力的铁磁性粉末的方法中，该方法包括将含有Co +2离子或Co + 2离子和另一种阳离子的水溶液和碱溶液加入到铁磁性氧化铁 含有这些离子给出的金属的改进，其中所述铁磁性氧化铁在制备悬浮液之前用还原剂处理。
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公开(公告)号：US4153920A
公开(公告)日：1979-05-08
申请号：US853569
申请日：1977-11-21
CPC分类号： G11B5/7315 , G11B5/656 , G11B5/7325 , Y10S428/90 , Y10T428/31
摘要： This invention relates to a magnetic recording medium comprising a ferromagnetic metal thin film as a magnetic recording layer on a non-magnetic flexible support, in which the surface roughness of the support is 0.10 .mu.m or less and the period of the surface roughness is v/10.sup.6 .mu.m or less where v represents a relative speed between a magnetic head and magnetic recording medium by .mu.m/sec. In the case of providing an undercoated layer between the magnetic recording layer and non-magnetic flexible support, the surface roughness of the undercoated layer is adjusted to 0.10 .mu.m or less and the period of the surface roughness is adjusted to v/10.sup.6 .mu.m or less.
摘要翻译： 本发明涉及一种磁性记录介质，其包括在非磁性柔性载体上作为磁记录层的强磁性金属薄膜，其中载体的表面粗糙度为0.10μm或更小，并且表面粗糙度的周期为v /106μm或更小，其中v表示磁头和磁记录介质之间的相对速度，单位为m / sec。 在磁记录层和非磁性柔性载体之间设置底涂层的情况下，将底涂层的表面粗糙度调整为0.10μm以下，将表面粗糙度的周期调整为v /106μm 或更少。
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7.发明授权Method of forming a metallic thin film by electroless plating on a vinylidene chloride undercoat 失效通过化学镀在偏二氯乙烯基底涂层上形成金属薄膜的方法
公开(公告)号：US4089993A
公开(公告)日：1978-05-16
申请号：US733920
申请日：1976-10-19
CPC分类号： C23C18/30 , C23C18/2033 , C23C18/2066 , C23C18/208 , C23C18/24 , C23C18/285 , H05K3/387
摘要： This invention relates to a method of forming a metallic thin film on a plastic substrate by electroless plating, which comprises providing an undercoated layer consisting essentially of polyvinylidene chloride or vinylidene chloride copolymer on the surface of the plastic substrate and then subjecting to a surface activating treatment and electroless plating.
摘要翻译： 本发明涉及通过化学镀在塑料基板上形成金属薄膜的方法，该方法包括在塑料基板的表面上提供基本上由聚偏二氯乙烯或偏二氯乙烯共聚物组成的底涂层，然后进行表面活化处理 和化学镀。
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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：US4097650A
公开(公告)日：1978-06-27
申请号：US717323
申请日：1976-08-24
CPC分类号： G11B5/656 , H01F10/28 , Y10S428/90 , Y10T428/265 , Y10T428/266 , Y10T428/269 , Y10T428/31
摘要： This invention relates to a magnetic recording medium comprising a ferromagnetic metal thin film as a magnetic recording layer on a non-magnetic flexible support, in which the surface roughness of the support is 0.10 .mu.m or less and the period of the surface roughness is v/10.sup.6 .mu.m or less where v represents a relative speed between a magnetic head and magnetic recording medium by .mu.m/sec. In the case of providing an undercoated layer between the magnetic recording layer and non-magnetic flexible support, the surface roughness of the undercoated layer is adjusted to 0.10 .mu.m or less and the period of the surface roughness is adjusted to v/10.sup.6 .mu.m or less.
摘要翻译： 本发明涉及一种磁性记录介质，其包括在非磁性柔性载体上作为磁记录层的强磁性金属薄膜，其中载体的表面粗糙度为0.10μm或更小，并且表面粗糙度的周期为v /106μm或更小，其中v表示磁头和磁记录介质之间的相对速度，单位为m / sec。 在磁记录层和非磁性柔性载体之间设置底涂层的情况下，将底涂层的表面粗糙度调整为0.10μm以下，将表面粗糙度的周期调整为v /106μm 或更少。
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10.发明授权
公开(公告)号：US4066564A
公开(公告)日：1978-01-03
申请号：US702171
申请日：1976-07-02
CPC分类号： G11B5/70694 , C01G49/06 , C01G49/08 , G11B5/70673 , G11B5/70689 , C01P2006/42
摘要： A Co- and Fe-containing ferromagnetic iron oxide powder having a high coercive force and improved stability to heat and pressure is produced by adding an aqueous alkali solution, an aqueous solution containing Co.sup.+2 ions, and an aqueous solution containing not more than 1 equivalent, based on the Co.sup.+2 ions, of Fe ions to a suspension of ferromagnetic iron oxide, and heating the mixture at a temperature of at least 80.degree. C in the presence of an oxidizing agent. The ferromagnetic iron oxide powder is especially suitable for producing magnetic recording media.
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