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    Magnetic recording medium
    41.
    发明公开
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：EP0077069A3

    公开(公告)日：1985-05-02

    申请号：EP82109425

    申请日：1982-10-12

    Applicant: Hitachi Maxell Ltd.

    Inventor： Karashima, Takato View Heights Room No. 502 ,  Zaitsu, Hiroshi

    IPC: G11B05/70 ,  G11B05/66

    CPC classification number: G11B5/716 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/24942

    Abstract: A magnetic recording medium having two magnetic layers, which comprises an upper magnetic layer and a lower magnetic layer, said lower magnetic layer having a coercive force of at least 100 oersteds, preferably 100 to 500 oersteds, lower than that of the upper magnetic layer, the thickness of the upper and lower magnetic layers being in the ratio of the thickness of the upper magnetic layer to that of the lower magnetic layer of 1/1 to 1/9, and the total coercive force of the upper and lower magnetic layers being 1,000 oersteds or more. The magnetic recording medium has excellent sensitivity and frequency characteristics at low and high frequency bands with less noise.

    Abstract translation: 1，一种具有两层磁性层的磁记录介质，它包括一上磁层和一下磁层，所述下磁层的矫顽力至少为100奥斯特，最好为100至500奥斯特，低于上磁层的矫顽力， 上和下磁层的厚度是上磁层和下磁层的厚度之比为1/1到1/9，并且上和下磁层的总矫顽力是 1000奥斯特或更多。 磁记录介质在低频和高频段具有优异的灵敏度和频率特性，噪声较小。

    Improved curable polyurethanes
    42.
    发明公开
    Improved curable polyurethanes 失效
    改进的可固化聚氨酯

    公开(公告)号：EP0097938A3

    公开(公告)日：1984-10-17

    申请号：EP83106216

    申请日：1983-06-25

    Applicant: The B.F. GOODRICH Company

    Inventor： Kolycheck, Edmond George

    IPC: C08L75/04 ,  C08G18/67 ,  C08G18/66 ,  C08F02/54 ,  G11B05/70

    CPC classification number: C09D175/14 ,  C08G18/6795 ,  C09D175/16 ,  C08L2666/22

    Abstract: Polyurethanes prepared from hydroxyl terminated polymers, organic diisocyanates and polyethers having terminal hydroxyl and unsaturated groups of terminal hydroxyl and pendant unsaturated groups, are soluble in solvents for deposition on a carrier that after removal of the solvent can be wound and processed as by calendaring and slitting immediately after removal from a solvent drying oven without layer to layer adhesion or other disruption of the coating. After such processing, the binder compositions containing the polyurethane may be crosslinked or cured in a few seconds by electron beam radiation to provide an improved stable coating. These polyurethanes combined with phenoxy resins form particularly useful binder systems for magnetic tape.

    Abstract translation: 由羟基封端的聚合物制备的聚氨酯，具有末端羟基和不饱和基团或末端羟基和侧基不饱和基团的有机二异氰酸酯和聚醚可溶于用于沉积在载体上的溶剂，在除去溶剂后可以通过压延和切割 立即从溶剂干燥炉中取出后，无层层粘合或其他涂层破裂。 在这种加工之后，含有聚氨酯的粘合剂组合物可以在几秒钟内通过电子束辐射交联或固化，以提供改进的稳定涂层。 这些与苯氧基树脂结合的聚氨酯形成用于磁带的特别有用的粘合剂体系。

    Magnetic recording element and method of manufacturing same
    47.
    发明公开
    Magnetic recording element and method of manufacturing same 失效
    磁记录元件及其制造方法

    公开(公告)号：EP0055994A3

    公开(公告)日：1982-08-04

    申请号：EP82200005

    申请日：1982-01-05

    Applicant: N.V. Philips' Gloeilampenfabrieken

    Inventor： Huisman, Hendrikus F. ,  de Bres, Johannes G. C. M.

    IPC: H01F01/11 ,  G11B05/70 ,  H01F01/06

    CPC classification number: G11B5/70657 ,  G11B5/70647 ,  G11B5/712

    Abstract: A magnetic recording element with a carrier and a magnetic coating which comprises a magnetic pigment dispersed in a binder in which the sulphate ions present on the surface of the pigment particles are bound in the form of a water-insoluble salt, as well as methods of manufacturing the magnetic recording element in which the magnetic pigment or a non-magnetic FeOOH pigment from which the magnetic pigment can be manufactured is treated with an aqueous solution of a water-soluble compound the cations of which form water-insoluble salts with the sulphate ions present on the surface of the pigment particles and the treated pigment is then processed according to known methods to a magnetic recording element or in which the above-mentioned compound is mixed with the ingredients of the magnetic coating and the resulting magnetic coating lacquer is provided on a carrier and dried.

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