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41 条记录 (耗时 0.024 秒)

    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
    6.
    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。

    Magnetic recording media
    9.
    发明授权
    Magnetic recording media 失效
    磁记录媒体

    公开(公告)号：US5209970A

    公开(公告)日：1993-05-11

    申请号：US567066

    申请日：1990-08-13

    申请人： Manfred Ohlinger ,  Jenoe Kovacs

    发明人： Manfred Ohlinger ,  Jenoe Kovacs

    IPC分类号： C09D5/23 ,  C09D7/12 ,  G11B5/706

    CPC分类号： G11B5/70636 ,  G11B5/70673 ,  G11B5/70678 ,  Y10S428/90 ,  Y10T428/257

    摘要： Abstract of the Disclosure: Magnetic recording media comprise a nonmagnetic substrate and a magnetizable layer arranged thereon and essentially consisting of a magnetic material from the group consisting of the cobalt-modified iron oxides and of the hexagonal ferrites and inorganic fillers finely dispersed in organic binders, the inorganic filler used being ferromagnetic chromium dioxide.

    摘要翻译： 摘要揭示：磁记录介质包括非磁性基片和可磁化层，其主要由钴改性铁氧化物和六方晶系铁氧体组成的组的磁性材料和细分散在有机粘合剂中的无机填料组成， 所用的无机填料是铁磁性二氧化铬。

    Improving the magnetic properties of gamma-iron (III) oxide
    10.
    发明授权
    Improving the magnetic properties of gamma-iron (III) oxide 失效
    提高γ-铁（III）氧化物的磁性能

    公开(公告)号：US4212903A

    公开(公告)日：1980-07-15

    申请号：US770989

    申请日：1977-02-22

    申请人： Georg Schnell ,  Fritz Hammon ,  Manfred Ohlinger

    发明人： Georg Schnell ,  Fritz Hammon ,  Manfred Ohlinger

    IPC分类号： G11B5/706 ,  H01F10/00 ,  B05D5/12

    CPC分类号： G11B5/70647 ,  G11B5/70652 ,  G11B5/70657 ,  Y10S428/90

    摘要： The invention relates to a process for improving the magnetic properties, especially the remanent magnetization, of gamma-iron(III) oxide which can be used advantageously as the magnetic component in magnetic recording media exhibiting reduced print-through. For this purpose, a gamma-iron(III) oxide manufactured according to known processes is heated at temperatures of from 400.degree. to 700.degree. C., the magnetic pigment having basic compounds on the crystal surface during this heat treatment and retaining a pH value above 8 until heating is over. Gamma-iron(III) oxide magnetic pigments treated in this way are particularly suitable for the manufacture of low-noise magnetic recording media with high remanent magnetization and particularly low print-through.

    摘要翻译： 本发明涉及一种用于改善氧化铁（III）的磁性能，特别是剩余磁化的方法，该方法可以有利地用作磁记录介质中的磁性组分，这些磁性组分表现出减少的打印通量。 为此，根据已知方法制造的γ-铁（III）氧化物在400℃至700℃的温度下加热，该磁性颜料在该热处理期间在晶体表面上具有碱性化合物，并保持pH值 高于8，直到加热结束。 以这种方式处理的氧化镍（III）磁性颜料特别适用于制造具有高剩余磁化强度和特别是低打印通量的低噪声磁记录介质。