Manufacture of gamma-iron(III) oxide
    10.
    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

    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。