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    • 1. 发明授权
    • Production of low color polyetherimides
    • 生产低色聚醚酰亚胺
    • US08080671B2
    • 2011-12-20
    • US12196479
    • 2008-08-22
    • Thomas L. GuggenheimRoy Ray OdleKarthik Venkataraman
    • Thomas L. GuggenheimRoy Ray OdleKarthik Venkataraman
    • C07D209/48
    • C07D209/48C08G73/1046C08G73/1071
    • The production of low color polyetherimides, including its intermediates, such as bisimides and diaryl diether dianhydrides, may be affected by producing an improved purity intermediate of 4-nitro-N-alkylphthalimide. A salt, such as alkali metal carbonate or alkali metal hydrogen carbonate, is added to an aqueous mixture of 4-nitro-N-alkylphthalimide and 3-nitro-N-alkylphthalimide to selectively hydrolyze the imide linkage of 3-nitro-N-alkylphthalimide forming a water-soluble acid-amide salt. An organic solvent is added to this salt mixture to phase separate 4-nitro-N-alkylphthalimide having dissolved in the organic solvent from acid-amide salt of 3-nitro-N-alkylphthalimide having dissolved in water.
    • 通过生产4-硝基-N-烷基邻苯二甲酰亚胺的改进的纯度中间体,可以影响低色度聚醚酰亚胺(包括其中间体,如双酰亚胺和二芳基二醚二酸酐)的生产。 将诸如碱金属碳酸盐或碱金属碳酸氢盐的盐加入4-硝基-N-烷基邻苯二甲酰亚胺和3-硝基-N-烷基邻苯二甲酰亚胺的水性混合物中以选择性水解3-硝基-N-烷基邻苯二甲酰亚胺的酰亚胺键 形成水溶性酸 - 酰胺盐。 向该盐混合物中加入有机溶剂,将溶解在有机溶剂中的4-硝基-N-烷基邻苯二甲酰亚胺溶解在溶解于水中的3-硝基-N-烷基邻苯二甲酰亚胺的酰胺盐相。