发明名称 |
Magnetic recording medium having a magnetic layer formed from an aromatic polycarbonate polyurethane resin |
摘要 |
A polycarbonate polyol having a main chain of the formula: <IMAGE> wherein R is an aliphatic or alicyclic hydrocarbon group having 4 to 10 carbon atoms, and n is a number of 2.00 to 20.00, and having an aliphatic OH group at the terminal; an aromatic polycarbonate polyurethane resin prepared from the polycarbonate polyol as set forth above and a polyisocyanate compound having two or more isocyanate groups in the molecule and optionally other components, particularly a chain extender having a polar group; a coating agent comprising the polycarbonate polyol and/or aromatic polycarbonate polyurethane resin as set forth above and optionally a polyisocyanate compound as set forth above and a solvent; a cast film comprising a coating film formed from the polycarbonate polyol and/or aromatic polycarbonate polyurethane resin as set forth above and a base film; and a magnetic recording medium comprising a magnetic layer formed from the aromatic polycarbonate polyurethane resin as set forth above and optionally the polyisocyanate compound as set forth above, and a base film.
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申请公布号 |
US5219663(A) |
申请公布日期 |
1993.06.15 |
申请号 |
US19910710397 |
申请日期 |
1991.06.05 |
申请人 |
HITACHI MAXELL, LTD. |
发明人 |
KOHNO, KENJI;NAGATAKI, YOSHIYUKI;MIYATA, KAZUSHI;HIGASHI, HIROSHI |
分类号 |
C08G18/44;C08G18/66;G11B5/702 |
主分类号 |
C08G18/44 |
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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