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41 条记录 (耗时 0.034 秒)

    Manufacture of acicular ferromagnetic iron particles
    7.
    发明授权
    Manufacture of acicular ferromagnetic iron particles 失效
    针状铁磁铁颗粒的制造

    公开(公告)号：US4178171A

    公开(公告)日：1979-12-11

    申请号：US888508

    申请日：1978-03-20

    申请人： Werner Steck ,  Rudolf Brodt ,  Wilhelm Sarnecki ,  Helmut Jakusch ,  Manfred Ohlinger ,  Eberhard Koester

    发明人： Werner Steck ,  Rudolf Brodt ,  Wilhelm Sarnecki ,  Helmut Jakusch ,  Manfred Ohlinger ,  Eberhard Koester

    IPC分类号： G11B5/706 ,  B22F9/22 ,  C09D5/23 ,  C09D7/12 ,  C21B15/00 ,  G11B5/712 ,  G11B5/714 ,  H01F1/06 ,  B22F9/00

    CPC分类号： H01F1/065 ,  B22F9/22 ,  C21B15/00 ,  G11B5/714

    摘要： A process for the manufacture of acicular ferromagnetic iron particles by reducing acicular iron(III) oxide hydroxides which consist of pure synthetic lepidocrocite or a mixture of synthetic goethite and at least 70% by weight of synthetic lepidocrocite.The iron(III) oxide hydroxides used carry, on their surface, an alkaline earth metal cation and an anion of a monobasic, dibasic or tribasic aliphatic carboxylic acid of up to 6 carbon atoms or an organic compound containing at least two groups capable of chelating the alkaline earth metal cation, and are produced in such a way that they consist of at least 70 percent by weight of lepidocrocite and have a length-to-width ratio of not less than 15:1.Reduction of such iron(III) oxide hydroxides gives iron particles with pronounced shape anisotropy, which exhibit both good magnetic properties and a narrow field strength distribution.

    摘要翻译： 通过还原针状铁（III）氢氧化物来制造针状铁磁性铁粒子的方法，该针状铁氧化物由纯合成锂铁矿石或合成针铁矿和至少70％重量的合成锂铁矿石混合物组成。 所用的氧化铁（III）氢氧化物在其表面上带有至多6个碳原子的一元，二元或三元脂肪族羧酸的碱土金属阳离子和阴离子，或含至少两个能够螯合的基团的有机化合物 碱土金属阳离子，并且以这样的方式制备，使得它们由至少70重量％的氯铁矿石组成，并且具有不小于15:1的长宽比。 这种氧化还原铁（III）氢氧化物的还原产生具有显着形状各向异性的铁颗粒，其具有良好的磁性能和窄的场强分布。

    Manufacture of gamma-iron(III) oxide
    10.
    发明授权
    Manufacture of gamma-iron(III) oxide 失效
    制造γ-铁（III）氧化物

    公开(公告)号：US4059716A

    公开(公告)日：1977-11-22

    申请号：US586346

    申请日：1975-06-12

    申请人： Helmut Kopke ,  Manfred Ohlinger ,  Werner Grau ,  Eduard Schoenafinger ,  Hans Henning Schneehage

    发明人： Helmut Kopke ,  Manfred Ohlinger ,  Werner Grau ,  Eduard Schoenafinger ,  Hans Henning Schneehage

    IPC分类号： C01G49/06 ,  G11B5/706 ,  H01F1/11 ,  H01F10/02

    CPC分类号： G11B5/70663 ,  C01G49/06 ,  G11B5/70657 ,  C01P2004/03 ,  C01P2004/10 ,  C01P2006/10 ,  C01P2006/42 ,  Y10T428/2991

    摘要： A process for the manufacture of acicular gamma-iron(III) oxide which, because of its improved dispersibility in organic binders, is suitable for the manufacture of magnetic recording media exhibiting a particularly high orientation ratio. For this purpose, the non-magnetic acicular .alpha.-iron(III) oxide or goethite pigment is treated with from 0.5 to 10% by weight, based on the pigment, of a compound of the formula I: ##STR1## where R.sup.1, R.sup.2 and R.sup.3 are hydrogen, alkyl of 1 to 24 carbon atoms or alkenyl of 1 to 24 carbon atoms and (RX).sup.- is selected from the group consisting of an aliphatic carboxylic acid of 1 to 18 carbon atoms, an aromatic carboxylic acid of 1 to 18 carbon atoms, a sulfonic acid and an ester of phosphoric acid and is then further processed by conventional methods to give gamma-iron(III) oxide.

    摘要翻译： 用于制造针状γ-氧化铁（III）的方法，其由于其在有机粘合剂中的分散性的改善而适用于制造表现出特别高取向比的磁记录介质。 为此，非磁性针状α-铁（III）氧化物或针铁矿颜料以基于颜料的0.5至10重量％的式I化合物处理：其中 R 1，R 2和R 3是氢，1至24个碳原子的烷基或1至24个碳原子的链烯基和（RX） - 选自1至18个碳原子的脂族羧酸，芳族羧酸 1至18个碳原子，磺酸和磷酸酯，然后通过常规方法进一步加工，得到γ-铁（III）氧化物。