发明名称 |
Magnetic recording medium |
摘要 |
A magnetic recording medium comprised of a non-magnetic substrate and a magnetic layer formed on one surface of the substrate and consisting essentially of a binder and magnetic powders. As the binder, a thermoplastic polyurethane-urea resin is employed, in which hydrophilic polar groups are introduced. The thermoplastic polyurethane-urea resin contains urethane and urea bonds in the molecule thereof and may be synthesized from a long-chain diol with a molecular weight of about 500 to 5000, a short-chain diol with a molecular weight of about 50 to 500, an organic diisocyanate and an organic diamine. Examples of the thus introduced hydrophilic polar groups are: <IMAGE>
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申请公布号 |
US4637959(A) |
申请公布日期 |
1987.01.20 |
申请号 |
US19840663377 |
申请日期 |
1984.10.22 |
申请人 |
SONY CORPORATION |
发明人 |
NINOMIYA, YOSHINOBU;SOMEZAWA, MASASHI;OIYAMA, KIYOKAZU |
分类号 |
C08G18/08;C08G18/38;C09D5/23;C09D127/04;C09D127/06;C09D175/00;C09D175/02;C09D175/04;G11B5/702;(IPC1-7):G11B5/72 |
主分类号 |
C08G18/08 |
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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