| 摘要 |
PURPOSE:To obtain the titled compound useful as a raw material for resins, medicines, etc., in a stable state with little production of fine powder undesirable to the human body, by dispersing a maleimide which is a solid at ordinary temperature in water heated at a specific temperature, cooling and coagulating the maleimide and filtering and drying the resultant granular maleimide. CONSTITUTION:A maleimide which is a solid at ordinary temperature, e.g. N-phenylmaleimide or N-(o-chlorophenyl)maleimide, having preferably 30-100 deg.C melting point is dispersed in water heated to the melting point or above of the maleimide. The temperature of the water for dispersion is preferably 5-15 deg.C higher than the melting point and the dispersion is cooled to coagulate the maleimide, which is then filtered and dried to afford the aimed compound. The maleimide is preferably dispersed in water in the presence of a polymerization inhibitor, e.g. methoxybenzoquinone, etc. The amount of the water to be used for the dispersion is 1-10 times, preferably 2-6 times based on the raw material maleimide.
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