发明名称 |
Magnetic recording medium. |
摘要 |
<p>A magnetic recording medium improved in the magnetic recording characteristics, running properties and durability is disclosed. The magnetic recording medium comprises a non-magnetic support having on a side of the support an upper magnetic layer positioned farther from the support and a lower magnetic layer positioned closer to the support. The upper magnetic layer comprises a binder, a magnetic powder having an original BET specific surface area of not less than than 30 m<2>/g and at least one abrasive selected from alumina, silicon carbide, Cr2O3, silica, alpha -Fe2O3, TiO2 and zilconia in a portion of 3 to 20 parts per 100 parts by weight of the magnetic powder, and the lower magnetic layer comprises a binder and a magnetic powder having an original BET specific surface area of less than 30 m<2>/g, and kinds of the binders each contained in the upper magnetic layer and the lower magnetic layer are the same.</p> |
申请公布号 |
EP0360175(A2) |
申请公布日期 |
1990.03.28 |
申请号 |
EP19890117162 |
申请日期 |
1989.09.16 |
申请人 |
KONICA CORPORATION |
发明人 |
NAKANO, YASUSHI;KAWAHARA, SETSUKO;OONUMA, KIKUO KONICA MAGNETIC PRODUCTS LTD.;UMEMURA, MASAHIRO;TOBISAWA, SEIICHI;NAKAJIMA, TAKESHI |
分类号 |
G11B5/708;C09D5/23;C09D127/04;C09D127/06;C09D175/00;C09D175/04;G11B5/702;G11B5/714;G11B5/716 |
主分类号 |
G11B5/708 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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