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    Manufacture of gamma-iron(III) oxide
    3.
    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：US4061725A

    公开(公告)日：1977-12-06

    申请号：US732899

    申请日：1976-10-15

    申请人： Manfred Ohlinger ,  Eduard Schoenafinger ,  Walter Schneider ,  Heinz Stritzinger ,  Guenter Vaeth

    发明人： Manfred Ohlinger ,  Eduard Schoenafinger ,  Walter Schneider ,  Heinz Stritzinger ,  Guenter Vaeth

    IPC分类号： C01G49/06 ,  G11B5/706 ,  H01F1/10 ,  H01F1/11 ,  C01G49/02

    CPC分类号： G11B5/70652 ,  C01G49/06 ,  G11B5/70647 ,  C01P2002/52 ,  C01P2004/10 ,  C01P2006/11 ,  C01P2006/42

    摘要： Acicular gamma-iron(III) oxide is manufactured by reacting an iron(II) salt solution with an aqueous solution of an alkali metal hydroxide and oxidizing the resulting suspension of iron(II) hydroxide in three stages. In a first stage, at most from 0.1 to 4% by weight of the amount of iron(II) hydroxide originally present is oxidized in the course of from 0.1 to 4 hours, in a second stage from 10 to 25% by weight of the said original amount are oxidized in the course of from 1.5 to 6 hours and in a third stage the remaining amount is oxidized. After the oxidation, the goethite formed is reduced to magnetite and the latter is then oxidized to acicular gamma-iron(III) oxide.

    摘要翻译： 通过使铁（II）盐溶液与碱金属氢氧化物的水溶液反应并将所得的氢氧化铁（II）悬浮液分三个阶段进行氧化，从而制造针状γ-铁（III）。 在第一阶段中，最初存在的氢氧化铁（II）的量的0.1至4重量％在0.1至4小时的过程中被氧化，在第二阶段中氧化为10至25重量％ 所述原始量在1.5至6小时的过程中被氧化，在第三阶段中剩余量被氧化。 氧化后，形成的针铁矿被还原成磁铁矿，后者被氧化成针状的γ-铁（III）氧化物。

    Manufacture of gamma-iron(III) oxide
    7.
    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。

    Manufacture of cobalt-modified .gamma.-iron(III)oxides
    9.
    发明授权
    Manufacture of cobalt-modified .gamma.-iron(III)oxides 失效
    钴改性的{65-铁（III）氧化物的制造

    公开(公告)号：US4064292A

    公开(公告)日：1977-12-20

    申请号：US656800

    申请日：1976-02-10

    申请人： Eduard Schoenafinger ,  Matthias Schwarzmann ,  Eberhard Koester

    发明人： Eduard Schoenafinger ,  Matthias Schwarzmann ,  Eberhard Koester

    IPC分类号： G11B5/706 ,  H01F10/02

    CPC分类号： G11B5/70689 ,  G11B5/70673

    摘要： The invention relates to the manufacture of acicular cobalt-modified .gamma.-iron(III) oxide by coating an acicular .alpha.-iron(III) oxide or its hydrate with an inorganic protective coating, subsequent reduction to magnetite at 350.degree. to 650.degree. C, application of the cobalt compound to this magnetite or to the .gamma.-iron(III) oxide obtained therefrom by oxidation, and subsequent heat treatment at 80.degree. to 300.degree. C, if necessary with simultaneous oxidation of the magnetite to the corresponding .gamma.-iron(III) oxide. This iron oxide has high coercivity and can be used as the magnetic component in magnetic recording media for recording high frequencies without having the disadvantage of thermal and mechanical instability.

    摘要翻译： 本发明涉及通过用无机保护涂层涂覆针状α-铁（III）或其水合物，然后在350至650℃下还原成磁铁矿，制造针状钴改性的氧化钇（III） 通过氧化将钴化合物施加到该磁铁矿或由其获得的γ-铁氧合物（III），随后在80℃至300℃下进行热处理，如果需要，将磁铁矿同时氧化成相应的γ-铁（ III）氧化物。 该氧化铁具有高的矫顽力，并且可以用作用于记录高频的磁记录介质中的磁性成分，而不存在热和机械不稳定性的缺点。