发明授权
US06686073B2 Magnetic recording medium containing specific binder in the magnetic layer and the lower non-magnetic layer 失效
在磁性层和下部非磁性层中含有特定粘结剂的磁记录介质

  • 专利标题: Magnetic recording medium containing specific binder in the magnetic layer and the lower non-magnetic layer
  • 专利标题(中): 在磁性层和下部非磁性层中含有特定粘结剂的磁记录介质
  • 申请号: US09988453
    申请日: 2001-11-16
  • 公开(公告)号: US06686073B2
    公开(公告)日: 2004-02-03
  • 发明人: Katsuhiko MeguroHiroshi HashimotoYuichiro Murayama
  • 申请人: Katsuhiko MeguroHiroshi HashimotoYuichiro Murayama
  • 优先权: JPP.2000-349680 20001116; JPP.2001-058349 20010302
  • 主分类号: B32B516
  • IPC分类号: B32B516
Magnetic recording medium containing specific binder in the magnetic layer and the lower non-magnetic layer
摘要:
A magnetic recording medium containing a support having provided thereon a lower layer containing a nonmagnetic powder and a binder and further provided thereon at least one magnetic layer containing a ferromagnetic powder and a binder. The lower layer can contain as a binder at least a monomer unit containing from 5 to 45% by weight of a (meth)acrylate unit containing a benzene ring and from 1 to 45% by weight of a radical polymerizable monomer unit containing a nitrogen atom, with these units making a total amount of 100% by weight. It can also contain an acrylic resin having a hydrophilic polar group. The magnetic recording medium may also contain a support having provided thereon at least one magnetic layer containing a ferromagnetic powder and a binder each in the dispersed state. The magnetic layer can contain at least a monomer unit comprising from 15 to 75% by weight of an alkyl (meth)acrylate as a binder and from 1 to 45% by weight of a radical polymerizable monomer unit containing nitrogen, with these units making a total amount of 100% by weight. It can also contain an acrylic resin having a hydrophilic polar group used in combination with a resin (A) defined herein; a resin (B) defined herein; or a resin (C) defined herein.
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