Production of magnetic recording media
    1.
    发明授权
    Production of magnetic recording media 失效
    生产磁记录介质

    公开(公告)号:US4581246A

    公开(公告)日:1986-04-08

    申请号:US756308

    申请日:1985-07-18

    CPC分类号: G11B5/7013

    摘要: Magnetic recording media are produced by preparing a dispersion consisting of finely divided magnetic material, a dispersant, the conventional additives and a solution or a dispersion of a polymeric binder, applying the dispersion in the form of a layer onto a non-magnetizable base, orienting the anisotropic magnetic material by means of a magnetic field and drying the applied layer, by a process in which the dispersant employed is obtained by reactingA. from 70 to 95 parts by weight of a reaction product ofI. from 0.5 to 1.5 moles of an oxoalcohol of 6 to 20 carbon atoms,II. from 6 to 18 moles of ethylene oxide andIII. from 2 to 10 moles of propylene oxide, withB. from 5 to 30 parts by weight of a polyphosphoric acid having a P.sub.2 O.sub.5 content of from 80 to 88%.

    摘要翻译: 通过制备由细碎的磁性材料,分散剂,常规添加剂和聚合物粘合剂的溶液或分散体组成的分散体制备磁记录介质,将层状分散体施加到不可磁化的基底上,定向 各向异性磁性材料通过磁场并干燥所施加的层,其中所用的分散剂是通过使A.A.反应产物为70〜95重量份,0.5〜1.5摩尔的 6至20个碳原子的二价醇,II。 6至18摩尔环氧乙烷和III。 2〜10摩尔环氧丙烷,B为5〜30重量份,P2O5含量为80〜88%的多磷酸。