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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。

    Process for the manufacture of ferromagnetic chromium dioxide
    4.
    发明授权
    Process for the manufacture of ferromagnetic chromium dioxide 失效
    制造铁磁性二氧化铬的工艺

    公开(公告)号：US4340494A

    公开(公告)日：1982-07-20

    申请号：US199347

    申请日：1980-10-21

    申请人： Manfred Ohlinger ,  Guenter Vaeth ,  Norbert Mueller ,  Eugen Wettstein

    发明人： Manfred Ohlinger ,  Guenter Vaeth ,  Norbert Mueller ,  Eugen Wettstein

    IPC分类号： C01G37/00 ,  C01G37/027 ,  G11B5/706 ,  H01F1/11 ,  H01F1/36

    CPC分类号： C01G37/027 ,  G11B5/70636 ,  C01P2006/11 ,  C01P2006/12 ,  C01P2006/42 ,  C01P2006/80

    摘要： A process for the manufacture of ferromagnetic chromium dioxide modified with foreign elements, by reacting oxides of trivalent and hexavalent chromium under superatmospheric pressure at an elevated temperature in the presence of water and of antimony(III) oxide as modifier, with or without other modifiers in an amount not exceeding 15% by weight, wherein the antimony(III) oxide employed as modifier is, to the extent of more than one-third, present as the senarmontite cubic modification, has a specific surface area, measured by the BET method, of from 1.5 to 15 m.sup.2 /g, and is added in a total amount of up to 0.5% by weight, based on the resulting chromium dioxide.

    摘要翻译： 在高温和高温下，在水和氧化锑（III）作为改性剂的情况下，通过使三价铬和六价铬的氧化物与三元和六价铬的氧化物反应来制造用异质元素改性的铁磁性二氧化铬的方法， 其量为不超过15重量％，其中用作改性剂的锑（III）氧化物的比表面积，通过BET法测定的比表面积为三分之一以上， 为1.5〜15m 2 / g，相对于所得到的二氧化铬，添加量为0.5重量％以下。

    Preparation of acicular gamma-iron(III) oxide of high coercive force
    6.
    发明授权
    Preparation of acicular gamma-iron(III) oxide of high coercive force 失效
    制备高矫顽力的针状γ-铁（III）氧化物

    公开(公告)号：US4362708A

    公开(公告)日：1982-12-07

    申请号：US320014

    申请日：1981-11-10

    申请人： Manfred Ohlinger ,  Hans Reichert ,  Guenter Vaeth ,  Friedrich R. Faulhaber ,  Horst Autzen ,  Peter Rudolf ,  Joachim Werther

    发明人： Manfred Ohlinger ,  Hans Reichert ,  Guenter Vaeth ,  Friedrich R. Faulhaber ,  Horst Autzen ,  Peter Rudolf ,  Joachim Werther

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

    CPC分类号： G11B5/70663 ,  C01G49/06 ,  C01P2004/10 ,  C01P2006/12 ,  C01P2006/42

    摘要： A process for the preparation of acicular gamma-iron(III) oxide of high coercive force by reducing acicular iron(III) oxide hydroxide, as it is being passed continuously through a furnace having two or more heating zones at from 190.degree. to 700.degree. C., by means of a gas mixture which is produced by passing a stream of inert gas, heated to above 250.degree. C., through an organic substance also heated to above 250.degree. C. in a vessel, and, on introduction into the furnace, is first brought into contact with the .alpha.-iron(III) oxide formed from the iron(III) oxide hydroxide by elimination of water in the first heating zone of the furnace at from 190.degree. to 250.degree. C., the .alpha.-iron(III) oxide thereby being converted to magnetite which is subsequently oxidized with an oxygen-containing gas at from 150.degree. to 400.degree. C., to give gamma-iron(III) oxide.

    摘要翻译： 一种通过还原针状氧化铁（III）氢氧化物制备高矫顽力的针状γ-铁（III）氧化物的方法，因为它连续通过具有两个或多个加热区的炉子在190℃至700℃ 通过将加热至高于250℃的惰性气体流通过容器中也被加热至高于250℃的有机物质，并通过引入到 炉子首先通过在190℃至250℃的炉的第一加热区中消除水而与由氧化铁（III）氧化物形成的α-铁（III）氧化物接触， 氧化铁（III），从而转化为磁铁矿，随后在150-400℃下用含氧气体氧化，得到氧化三氯化铁（III）。

    Magnetic recording media
    8.
    发明授权
    Magnetic recording media 失效
    磁记录媒体

    公开(公告)号：US4357378A

    公开(公告)日：1982-11-02

    申请号：US234708

    申请日：1981-02-17

    申请人： Guenter Vaeth ,  Rudolf Bachmann ,  Werner Senkpiel ,  Hans-Joerg Hartmann ,  Roland Falk ,  Herbert Motz

    发明人： Guenter Vaeth ,  Rudolf Bachmann ,  Werner Senkpiel ,  Hans-Joerg Hartmann ,  Roland Falk ,  Herbert Motz

    IPC分类号： C09D5/23 ,  G11B5/702 ,  B32B3/02

    CPC分类号： G11B5/7022 ,  Y10S428/90 ,  Y10T428/31605 ,  Y10T428/31609 ,  Y10T428/31699 ,  Y10T428/31935

    摘要： The invention relates to magnetic recording media comprising a non-magnetic base and, applied thereto, a firmly adhering magnetic coating based on a finely divided magnetic pigment and a special binder mixture. This binder mixture consists essentially of 20 to 90 percent by weight of an elastomeric polyurethane which is soluble in a volatile organic solvent, is practically free of isocyanate groups and has been obtained from a linear, aliphatic polyester or polyether and a diisocyanate of 6 to 24 carbon atoms, and of 10 to 80 percent by weight of a vinyl chloride copolymer which contains 50 to 90 percent by weight of vinyl chloride units and 10 to 50 percent by weight of units of one or more diesters of maleic acid with an alcohol of 1 to 3 carbon atoms, or of the reaction product of this binder mixture with a polyisocyanate of 6 to 50 carbon atoms. Magnetic coatings containing such a binder mixture are distinguished by improved surface hardness coupled with improved orientability of the magnetic particles, as a result of which such recording media are particularly suitable for modern video- and audio-recording instruments.

    摘要翻译： 本发明涉及包含非磁性基底的磁记录介质，并且在其上施加基于细分磁性颜料和特殊粘合剂混合物的牢固粘附的磁性涂层。 该粘合剂混合物基本上由20至90重量％的可溶于挥发性有机溶剂的弹性体聚氨酯组成，实际上不含异氰酸酯基团，并且由线性脂族聚酯或聚醚和6至24的二异氰酸酯获得 和10至80重量％的氯乙烯共聚物，其含有50至90重量％的氯乙烯单元和10至50重量％的一种或多种马来酸二醇与醇的共聚物1 或者该粘合剂混合物与6至50个碳原子的多异氰酸酯的反应产物。 含有这种粘合剂混合物的磁性涂层的特征在于改进的表面硬度以及磁性颗粒的改进的取向性，结果这种记录介质特别适用于现代的视频和音频记录仪器。

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

    公开(公告)号：US4091143A

    公开(公告)日：1978-05-23

    申请号：US624580

    申请日：1975-10-22

    申请人： Hans Joerg Hartmann ,  Guenter Vaeth ,  Helmut Kopke

    发明人： Hans Joerg Hartmann ,  Guenter Vaeth ,  Helmut Kopke

    IPC分类号： G11B5/702 ,  G11B5/706 ,  H01F10/02

    CPC分类号： G11B5/7028 ,  G11B5/70636 ,  Y10S428/90 ,  Y10T428/256

    摘要： Magnetic recording media, the magnetic coating of which consists of a dispersion of elongated ferromagnetic chromium dioxide particles in an organic binder, the dispersions exhibiting particularly good storage stability. This is achieved by admixing 0.5 to 6% by weight, based on the amount of chromium dioxide pigment, of the zinc salt of an aliphatic carboxylic acid of 8 to 18 carbon atoms, during the manufacture of the chromium dioxide dispersions. Chromium dioxide dispersions with good storage stability and a high degree of orientation of the elongated magnetic particles in the magnetic coating are thus obtained in a simple manner.

    摘要翻译： 磁记录介质，其磁性涂层由细长的铁磁性二氧化铬颗粒在有机粘合剂中的分散体组成，分散体表现出特别好的储存稳定性。 这是通过在二氧化铬分散体的制造过程中将基于二氧化铬颜料的含量为0.5至6重量％的8至18个碳原子的脂族羧酸的锌盐混合而实现的。 因此，以简单的方式获得具有良好的储存稳定性和磁性涂层中细长磁性颗粒的高取向度的二氧化铬分散体。