发明名称 |
Polyetherimide preparation method including addition of macrocyclic polyetherimide oligomers |
摘要 |
Macrocyclic polyether oligomers, preferably as mixtures of oligomers of different degrees of polymerization, are incorporated in a direct displacement reaction mixture for the formation of polyetherimides, said reaction mixture comprising at least one alkali metal salt of a dihydroxy-substituted aromatic hydrocarbon and at least one bis(halo- or nitrophthalimide). The macrocyclic oligomers can be isolated from an earlier-prepared linear polyetherimide composition. Their incorporation in the reaction mixture does not increase the proportion of oligomers in the polyetherimide product.
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申请公布号 |
US5856421(A) |
申请公布日期 |
1999.01.05 |
申请号 |
US19970818987 |
申请日期 |
1997.03.17 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
SCHMIDHAUSER, JOHN CHRISTOPHER |
分类号 |
C08K5/3415;C08G73/10;C08L79/08;(IPC1-7):C08G73/10 |
主分类号 |
C08K5/3415 |
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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