发明名称 |
Magnetic recording medium having a lower layer containing a specified polyurethane binder |
摘要 |
The present invention provides a magnetic recording medium having high durability and excellent electromagnetic transfer characteristics and having a lower coating layer, which contains a binder and has high dispersion property and durability. The magnetic recording medium comprises a lower coating layer where non-magnetic powder or ferromagnetic power is dispersed in a binder and an upper magnetic layer where ferromagnetic powder is dispersed in a binder, said two layers being placed on a non-magnetic support member, whereby the binder of the lower coating layer comprises polyurethane resin, which is a reaction product using diol and organic diisocyanate as major materials, the polyurethane resin contains short-chain diol having cyclic structure by 17 to 40 weight %, and the polyurethane resin contains long-chain diol, containing ether groups by 1.0 to 5.0 mmol/g to the entire polyurethane resin, by 10 to 50 weight %.
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申请公布号 |
US5908691(A) |
申请公布日期 |
1999.06.01 |
申请号 |
US19960772575 |
申请日期 |
1996.12.26 |
申请人 |
FUJI PHOTO FILM CO., LTD. |
发明人 |
MURAYAMA, YUICHIRO;SATAKE, MASAKI;HASHIMOTO, HIROSHI;OKITA, TSUTOMU |
分类号 |
C09D5/23;C09D175/04;G11B5/702;G11B5/738;(IPC1-7):G11B5/702 |
主分类号 |
C09D5/23 |
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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