发明授权
- 专利标题: Magnetic recording medium
- 专利标题(中): 磁记录介质
-
申请号: US742815申请日: 1996-11-01
-
公开(公告)号: US5795642A公开(公告)日: 1998-08-18
- 发明人: Akira Ishikawa , Hidehiko Nakayama , Kazutaka Yamashita
- 申请人: Akira Ishikawa , Hidehiko Nakayama , Kazutaka Yamashita
- 申请人地址: JPX Tokyo
- 专利权人: Kao Corporation
- 当前专利权人: Kao Corporation
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX8-107909 19960426
- 主分类号: C09D5/23
- IPC分类号: C09D5/23 ; G11B5/70 ; G11B5/735 ; G11B5/738 ; G11B5/66
摘要:
Magnetic recording media comprising a nonmagnetic substrate, a surface layer and a back layer, the surface layer having an intermediate layer provided on the surface side of the nonmagnetic substrate and a magnetic layer as a top layer, the back layer having a backcoating layer provided on the back side of the nonmagnetic substrate, the magnetic layer containing a ferromagnetic metal powder and a binder, wherein the surface layer has a residual solvent content of 5 to 1000 ppm, the ferromagnetic metal powder is a ferromagnetic metal powder mainly comprising iron and containing 0.8 to 20 parts by weight of at least one element selected from Group IIIa elements, inclusive of lanthanides, of the Periodic Table per 100 parts by weight of Fe atoms, the magnetic layer has a thickness of 0.05 to 0.6 .mu.m, the magnetic layer has a center-line surface roughness Ra of 1 to 5 nm, the back layer has a residual solvent content of 5 to 800 ppm, and the backcoating layer has a center-line surface roughness Ra of 2 to 8 nm, exhibit excellent electromagnetic characteristics and storage stability.
公开/授权文献
- US5181270A Optical fiber canister 公开/授权日:1993-01-19
信息查询
IPC分类: