发明申请
- 专利标题: MAGNETIC RECORDING MEDIUM
- 专利标题(中): 磁记录介质
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申请号: US11461051申请日: 2006-07-31
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公开(公告)号: US20070026264A1公开(公告)日: 2007-02-01
- 发明人: Takayoshi Kuwajima , Akinori Nishizawa , Akihiko Seki
- 申请人: Takayoshi Kuwajima , Akinori Nishizawa , Akihiko Seki
- 申请人地址: JP Tokyo
- 专利权人: TDK CORPORATION
- 当前专利权人: TDK CORPORATION
- 当前专利权人地址: JP Tokyo
- 优先权: JP2005/222402 20050801
- 主分类号: G11B5/716
- IPC分类号: G11B5/716 ; G11B5/71
摘要:
A magnetic recording medium has a non-magnetic layer and a magnetic layer formed in that order on one surface of a non-magnetic support and a back coat layer formed on the other surface of the non-magnetic support. The non-magnetic layer is formed so as to include at least one of α-iron oxide and α-iron hydroxide. The magnetic layer is formed so as to include a ferromagnetic alloy powder. The back coat layer is formed so as to include carbon black, and barium sulfate. At least one of the non-magnetic layer and the magnetic layer includes lubricant. The layers are formed so that the amount of SO42− eluted when the magnetic recording medium is immersed in water at 70° C. is in a range of 300 ppm to 600 ppm inclusive relative to the weight of the magnetic recording medium.