发明名称 |
Polymerizing bis-maleimides |
摘要 |
Processes for preparing polyimides from bis-maleimides are provided. In these processes, a bis-maleimide is polymerized in the presence of a catalytic amount (usually about 0.01 to 5% by weight of the bis-maleimide) of an alkali metal salt of a Bronsted acid. Preferably, the polymerization is also conducted in the presence of a small amount (usually 0.01 to 5% by weight of the bis-maleimide) of an activator for the catalyst. The activator is an aprotic organic compound having a dielectric constant between about 35 and 45. Melt polymerization is preferred at a preferred temperature of 150 DEG to 275 DEG C.
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申请公布号 |
US3890272(A) |
申请公布日期 |
1975.06.17 |
申请号 |
US19730363799 |
申请日期 |
1973.05.25 |
申请人 |
UNIVERSITY OF NOTRE DAME DU LAC |
发明人 |
D'ALELIO, GAETANO FRANCIS |
分类号 |
C08F4/00;C08F4/06;C08F20/00;C08F22/36;C08F290/00;C08F299/00;C08G73/12;(IPC1-7):C08G20/32 |
主分类号 |
C08F4/00 |
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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