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A method for the production of polyether imides, with addition of macro cyclic poly ether imide oligomers
A method for the production of polyether imides, with addition of macro cyclic poly ether imide oligomers
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机译:一种添加大环聚醚酰亚胺低聚物的聚醚酰亚胺的生产方法
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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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