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    • 5. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US4364988A
    • 1982-12-21
    • US61253
    • 1979-07-27
    • Haruo AndohSusumu KitaokaToshinobu SueyoshiHikaru IshidaAkira Kato
    • Haruo AndohSusumu KitaokaToshinobu SueyoshiHikaru IshidaAkira Kato
    • G11B5/706G11B5/70
    • G11B5/70642G11B5/70673Y10S428/90Y10T428/24942Y10T428/257
    • An improved magnetic recording medium is disclosed, particularly a magnetic tape suitable for sound recording and video recording, which comprises as a recording element a mixture of cobalt-containing iron oxide magnetic particles consisting essentially of ferromagnetic iron oxide particles containing cobalt and optionally a divalent iron in the most outer layer thereof, and .gamma.-ferric oxide particles in the ratio of 10:90 to 50:50 by weight, said mixture of cobalt-containing iron oxide magnetic particles and .gamma.-ferric oxide particles being applied to a substrate (e.g. a polyester film) with a binding agent. The magnetic recording medium has excellent electromagnetic transducing properties and improved charging properties and is useful for conventional magnetic recording apparatus used at normal position with high sensitivity in wide range of frequency.
    • 公开了一种改进的磁记录介质,特别是适用于录音和视频记录的磁带,其包括作为记录元件的含钴氧化铁磁性颗粒的混合物,其主要由含有钴的铁磁性氧化铁颗粒和任选的二价铁组成 在其最外层和按重量比例为10:90至50:50的γ-氧化铁颗粒,将所述含钴氧化铁磁性颗粒和γ-氧化铁颗粒的混合物施加到基底(例如, 聚酯薄膜)。 磁记录介质具有优异的电磁感应特性和改善的充电特性,对于在宽频率范围内具有高灵敏度的正常位置使用的常规磁记录装置是有用的。
    • 8. 发明授权
    • Process for preparing ferromagnetic particles comprising metallic iron
    • 制备包含金属铁的铁磁颗粒的方法
    • US4456475A
    • 1984-06-26
    • US516432
    • 1983-07-25
    • Shigeo HiraiToshinobu SueyoshiMasahiro Amemiya
    • Shigeo HiraiToshinobu SueyoshiMasahiro Amemiya
    • H01F1/06
    • H01F1/065
    • A process for preparing ferromagnetic particles comprising metallic iron as the major component by oxidizing Fe(OH).sub.2 in an aqueous medium adjusted to a pH of not less than 11 with gaseous oxygen to produce particles of .alpha.-FeOOH, optionally followed by dehydration of the .alpha.-FeOOH particles under heating to produce particles of .alpha.-Fe.sub.2 O.sub.3, and reducing the .alpha.-FeOOH or .alpha.-Fe.sub.2 O.sub.3 particles under heating, characterized in that (1) the aqueous medium at the oxidation step comprises at least one metal compound chosen from compounds of alkaline earth metals, zinc and aluminum and (2) the coating of a silicon compound is applied to the .alpha.-FeOOH or .alpha.-Fe.sub.2 O.sub.3 particles before the reduction step, whereby the ferromagnetic particles of metallic iron having enhanced magnetic characteristics are obtained.
    • 通过用气态氧将调节至pH不低于11的水性介质中的Fe(OH)2氧化以产生α-FeO​​OH颗粒,制备包含金属铁作为主要成分的铁磁颗粒的方法,任选地随后脱水 α-FeO​​OH颗粒在加热下产生α-Fe 2 O 3颗粒,并在加热下还原α-FeO​​OH或α-Fe2O3颗粒,其特征在于:(1)氧化步骤中的水性介质包含至少一种选自化合物 的碱土金属,锌和铝,和(2)在还原步骤之前,将α-FeO​​OH或α-Fe2O3颗粒涂覆到硅化合物上,由此获得具有增强的磁特性的金属铁的铁磁颗粒。