发明授权
US5478626A Magnetic recording medium having a magnetic layer with specified limits
of both Ra and R10z surface roughness
失效
磁记录介质具有规定的Ra和R10z表面粗糙度极限的磁性层
- 专利标题： Magnetic recording medium having a magnetic layer with specified limits of both Ra and R10z surface roughness
- 专利标题（中）： 磁记录介质具有规定的Ra和R10z表面粗糙度极限的磁性层
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申请号： US315896申请日： 1994-09-30
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公开(公告)号： US5478626A公开(公告)日： 1995-12-26
- 发明人: Takahiro Mori , Kunitsuna Sasaki , Hisato Kato , Kazuyoshi Imai , Takahiro Hayashi
- 申请人： Takahiro Mori , Kunitsuna Sasaki , Hisato Kato , Kazuyoshi Imai , Takahiro Hayashi
- 申请人地址： JPX JPX
- 专利权人： Konica Corporation,TDK Corporation
- 当前专利权人： Konica Corporation,TDK Corporation
- 当前专利权人地址： JPX JPX
- 优先权： JPX5-271323 19931004
- 主分类号： G11B5/70
- IPC分类号： G11B5/70 ; G11B5/714 ; G11B5/716 ; G11B5/738 ; G11B5/78 ; G11B5/842 ; G11B5/00
摘要：
Disclosed are a magnetic recording medium which comprises a non-magnetic support, one or more coating layers provided on the non-magnetic support and an upper layer of the coating layers being a magnetic layer containing ferromagnetic metallic powder with the total thickness of the coating layers being 0.5 to 2.5 .mu.m, wherein the magnetic layer has a surface roughness Ra of 1.0 to 4.6 nm and a surface roughness R10z of 8.0 to 35.0 nm, which satisfy the relations of:Ra.ltoreq.-0.47t+0.5/t+3.8 andR10z.ltoreq.-1.50t+6.0/t+23.0where t is the total thickness of the coating layers in terms of .mu.m,and an aliphatic acid ester is contained in the surface portion of the magnetic layer in an amount of 5 to 50 mg/m.sup.2, and a process for preparing the same.