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Purification of bismaleimides

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专利汇可以提供Purification of bismaleimides专利检索,专利查询,专利分析的服务。并且PURPOSE: To purify the titled compound useful as a raw material for resins in high yield and in high purity without requiring heating operations, etc., from a reaction product obtained by bringing a crude bismaleimide into contact with CO
2 in a critical state.
CONSTITUTION: Carbon dioxide in a critical state is brought into contact with a crude bismaleimide shown by formula I [Z is group shown by formula II, formula III, etc.] to give carbon dioxide containing the bismaleimide and the bismaleimide is separated from the carbon dioxide. The carbon dioxide in the critical condition has extracting conditions of 31.1°C temperature and 74.2W500kg/cm
2 G pressure, preferably 40W140°C and 75W300kg/cm
2 . The higher the temperature and the pressure are, the higher solubility the maleimide has and extraction efficiency is also improved.
COPYRIGHT: (C)1988,JPO&Japio,下面是Purification of bismaleimides专利的具体信息内容。

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