| 摘要 |
PROBLEM TO BE SOLVED: To provide an economical and effective method substituting for conventional methods for the direct synthesis of isocyanate and polyisocyanate. SOLUTION: This invention relates to a one-pot method for synthesis of isocyanates, polyisocyanates or mixtures thereof. The method includes the steps of (i) preparing a mixture comprising an amine, an alcohol, an oxygen-containing gas, carbon monoxide, a metal complex catalyst selected from the group consisting of macrocyclic complex catalysts and cobalt Schiff base catalysts; and a solvent selected from the group consisting of aliphatic or aromatic halocarbons, perhalogenated alcohols, halogenated ethers, halogenated ketones, perfluorinated hydrocarbons, polymers of chlorotrifluoroethylene having the formula -(CF<SB>2</SB>-CFCl)<SB>n</SB>(wherein n is between 2 and 10) and mixtures thereof, (ii) subjecting the resulting mixture to a first heating under pressure, (iii) cooling and depressurizing the mixture resulting from the previous step and (iv) subjecting the mixture to a second heating to separate out the isocyanate product from the mixture. COPYRIGHT: (C)2008,JPO&INPIT
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