发明名称 |
Magnetic recording medium comprising a polyurethane resin coating residual groups derived from specified phosphorous containing compounds |
摘要 |
A magnetic coating formulation is composed principally of magnetic particles and a binder. At least a portion of the binder is a polyurethane resin synthesized from a reactant mixture of specific phosphorus compound, epoxy compound, isocyanate compound and polyfunctional hydroxy compounds. The reactant mixture may optionally contain a chain extender. The polyurethane resin contains one phosphoric acid group or one residual group derived from phosphoric acid per 3,000-200,000 number average molecular weight of the polyurethane resin, and has a number average molecular weight of 4,000-150,000. A magnetic recording medium with a magnetic coating layer formed from the magnetic coating formulation is also disclosed. The magnetic coating layer features not only excellent dispersion of magnetic particles, in other words, excellent magnetic characteristics but also superb durability.
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申请公布号 |
US5158830(A) |
申请公布日期 |
1992.10.27 |
申请号 |
US19910684534 |
申请日期 |
1991.05.09 |
申请人 |
THE B. F. GOODRICH COMPANY |
发明人 |
YASUDA, MASAHIKO;HOSOKAWA, SHIGEO;YOKOMORI, YOROZU;JIMBO, SHINICHIRO |
分类号 |
C08G18/08;C08G18/38;C08G18/50;C08G18/58;G11B5/702 |
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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