发明申请
- 专利标题: METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM MANUFACTURED BY THE SAME
- 专利标题(中): 制造磁记录介质的方法和由其制造的磁记录介质
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申请号: US12244556申请日: 2008-10-02
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公开(公告)号: US20090092857A1公开(公告)日: 2009-04-09
- 发明人: Ayako MATSUMOTO , Satoshi Matsubaguchi
- 申请人: Ayako MATSUMOTO , Satoshi Matsubaguchi
- 申请人地址: JP Tokyo
- 专利权人: FUJIFILM Corporation
- 当前专利权人: FUJIFILM Corporation
- 当前专利权人地址: JP Tokyo
- 优先权: JP2007-260409 20071003
- 主分类号: G11B5/842
- IPC分类号: G11B5/842 ; G11B5/68
摘要:
The present invention relates to a method of manufacturing a magnetic recording medium comprising coating a magnetic layer coating liquid comprising a ferromagnetic hexagonal ferrite powder and a binder to form a coating film, subjecting the coating film to orientation processing while the coating film is still wet, and drying the coating film to form a magnetic layer. The magnetic layer coating liquid is prepared by subjecting a ferromagnetic hexagonal ferrite powder with an average plate diameter of 10 to 50 nm to a dry comminution step, subjecting the ferromagnetic hexagonal ferrite powder to a first dispersion step together with a binder to prepare a dispersion liquid, and sequentially subjecting the dispersion liquid obtained to a second dispersion step and a filtering step. The dispersion liquid obtained by the first dispersion step comprises a dry solid component in an amount, as measured after filtration, of 15 percent or less.