发明授权
- 专利标题: Magnetic recording medium and method of manufacturing the same
- 专利标题(中): 磁记录介质及其制造方法
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申请号: US13051765申请日: 2011-03-18
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公开(公告)号: US08795858B2公开(公告)日: 2014-08-05
- 发明人: Masahide Sato , Katsumi Araki , Kazufumi Omura , Tomohiro Ichikawa , Shinji Tsujimoto , Tadahiro Ooishi
- 申请人: Masahide Sato , Katsumi Araki , Kazufumi Omura , Tomohiro Ichikawa , Shinji Tsujimoto , Tadahiro Ooishi
- 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
- 代理机构: Sughrue Mion, PLLC
- 优先权: JP2010-063524 20100319; JP2011-059997 20110318
- 主分类号: G11B5/716
- IPC分类号: G11B5/716
摘要:
An aspect of the present invention relates to a magnetic recording medium comprising a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support, wherein the binder of the magnetic layer is a mixture of a vinyl chloride copolymer, polyurethane resin, and polyisocyanate, the polyurethane resin having a glass transition temperature ranging from 90 to 130° C. and a storage elastic modulus at 80° C. ranging from 2.5 to 5.0 GPa, the nonmagnetic layer is a radiation-cured layer formed by curing with radiation a radiation-curable composition comprising a nonmagnetic powder and a binder component, the binder component comprising a radiation-curable vinyl chloride copolymer and a radiation-curable polyurethane resin, and the radiation-curable vinyl chloride copolymer and radiation-curable polyurethane resin both have glass transition temperatures ranging from 30 to 100° C.
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