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    Manufacture of gamma-iron(III) oxide
    1.
    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 gamma-iron(III) oxide
    4.
    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：US4071610A

    公开(公告)日：1978-01-31

    申请号：US677920

    申请日：1976-04-19

    申请人： Eberhard Koester ,  Gerd Wunsch ,  Eduard Schoenafinger ,  Hans Henning Schneehage

    发明人： Eberhard Koester ,  Gerd Wunsch ,  Eduard Schoenafinger ,  Hans Henning Schneehage

    IPC分类号： C01G49/08 ,  C01G49/00 ,  C01G49/06 ,  C01G51/00 ,  G11B5/706 ,  H01F1/11 ,  C01G49/02

    CPC分类号： G11B5/70673 ,  C01G49/06 ,  G11B5/70663 ,  C01P2006/42

    摘要： A process for the manufacture of acicular gamma-iron(III) oxide, in which the non-magnetic, acicular iron(III) oxide is treated with a solution of a compound of the formula I ##STR1## where R.sup.1 and R.sup.2 are ##STR2## or O--R.sup.5, R.sup.3 is H, OH, ##STR3## or O--R.sup.5, R.sup.4 is alkyl or cycloalkyl of 1 to 16 carbon atoms and the R.sup.4 's may be identical or different, and R.sup.5 is alkyl, cycloalkyl or aralkyl of 3 to 18 carbon atoms, and is then converted to gamma-iron(III) oxide by reduction to magnetite, followed by oxidation.The gamma-iron(III) oxide obtained is distinguished by a high coercive force and improved magnetic orientation when used as a magnetic pigment for the manufacture of magnetic recording media.

    摘要翻译： 一种用于制造针状γ-铁（III）氧化物的方法，其中非磁性针状铁（III）氧化物用式I化合物（I）的溶液处理，其中R1和R2 或者O-R5，R 3是H，OH，O或R 5，R 4是1至16个碳原子的烷基或环烷基，R 4可以相同或不同，R 5是烷基，环烷基或 3至18个碳原子的芳烷基，然后通过还原成磁铁矿转化为γ-铁（III）氧化物，随后进行氧化。

    Manufacture of gamma-iron (III) oxide
    5.
    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：US4018882A

    公开(公告)日：1977-04-19

    申请号：US616863

    申请日：1975-09-25

    申请人： Eberhard Koester ,  Gerd Wunsch ,  Eduard Schoenafinger ,  Hans Henning Schneehage ,  Helmut Jakusch

    发明人： Eberhard Koester ,  Gerd Wunsch ,  Eduard Schoenafinger ,  Hans Henning Schneehage ,  Helmut Jakusch

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

    CPC分类号： G11B5/70663 ,  C01G49/06 ,  C01P2004/10 ,  C01P2006/42

    摘要： A process for the manufacture of acicular magnetic gamma-iron(III) oxide by reducing acicular alpha-iron(III) oxide to magnetite and then oxidizing it to gamma-iron(III) oxide, wherein the alpha-iron(III) oxide is treated with a water-soluble alkaline earth metal compound and an alkylphenol with one to three alkyl radicals, each of 4 to 24 carbon atoms, on the benzene nucleus. Gamma-iron(III) oxides manufactured in this way show better magnetic orientability in the binder-containing dispersion, and a higher coercive force than prior art magnetic pigments.

    摘要翻译： 通过将针状氧化铁（III）还原成磁铁矿然后将其氧化成γ-铁（III）氧化物来制造针状磁性γ-铁（III）氧化物的方法，其中氧化铁（III）为 在苯核上用水溶性碱土金属化合物和烷基酚与一至三个碳原子数为4〜24个的烷基进行处理。 以这种方式制造的γ-氧化铁（III）氧化物在含粘合剂的分散体中显示出更好的磁定向性，并且比现有技术的磁性颜料具有更高的矫顽力。

    Manufacture of gamma-iron(III) oxide
    8.
    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。