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    • 100. 发明授权
    • Magnetic recording media prepared from magnetic particles having an
extremely thin, continuous, amorphous, aluminum hydrous oxide coating
    • 由具有极薄,连续,无定形的水合氧化铝涂层的磁性颗粒制备的磁记录介质
    • US6136428A
    • 2000-10-24
    • US457200
    • 1995-06-01
    • Jack G. TruongThomas E. Wood
    • Jack G. TruongThomas E. Wood
    • G11B5/706B22F1/02G11B5/712H01F1/11H01F1/44
    • H01F1/112B22F1/02G11B5/712H01F1/44Y10S428/90Y10T428/25Y10T428/256Y10T428/257Y10T428/2991Y10T428/2998
    • In one aspect, the present invention concerns a process of making coated magnetic particles. According to this process, an aqueous sol of amorphous, hydrolyzed, aluminous, colloidal particles is mixed with an aqueous suspension comprising magnetic particles. The amorphous, hydrolyzed, aluminous, colloidal particles have a mean particle size in the range from about 0.5 to about 5 nanometers and an average degree of hydrolysis in the range from 1.5 to about 3. During mixing, the amorphous, hydrolyzed, aluminous, colloidal particles form a continuous, amorphous, aluminum hydrous oxide coating on the magnetic particles, wherein the coating has an average thickness in the range from about 0.5 to about 5 nanometers. The present invention also concerns coated magnetic particles. Coated magnetic particles according to the present invention comprise a magnetizable core and a continuous, amorphous, aluminum hydrous oxide coating formed on the magnetizable core. The coating has an average thickness in the range from about 0.5 to about 5 nanometers. In another aspect, the present invention concerns a magnetic recording medium comprising a magnetic layer formed on a nonmagnetizable support. The magnetic layer comprises the coated magnetic particles described above dispersed in a polymeric binder.
    • 一方面,本发明涉及制备涂覆的磁性颗粒的方法。 根据该方法,将无定形,水解,铝质胶体颗粒的水性溶胶与包含磁性颗粒的水性悬浮液混合。 无定形的,水解的,高铝的胶体颗粒的平均粒度在约0.5至约5纳米的范围内,平均水解度在1.5至约3的范围内。在混合期间,无定形的,水解的,含铝的胶体 颗粒在磁性颗粒上形成连续的无定形的水合氧化铝涂层,其中涂层的平均厚度在约0.5至约5纳米的范围内。 本发明还涉及涂覆的磁性颗粒。 根据本发明的涂覆磁性颗粒包含形成在可磁化芯上的可磁化芯和连续的无定形铝水合氧化物涂层。 该涂层的平均厚度在约0.5至约5纳米的范围内。 另一方面,本发明涉及包含形成在不可磁化载体上的磁性层的磁记录介质。 磁性层包括分散在聚合物粘合剂中的上述涂覆的磁性颗粒。