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Process for the preparation of isocyanurate containing uretdions from isophorondiisocyanate and the uretdions obtained following this process
Process for the preparation of isocyanurate containing uretdions from isophorondiisocyanate and the uretdions obtained following this process
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机译:由异佛尔酮二异氰酸酯制备含异氰脲酸酯的脲醛的方法以及通过该方法获得的脲醛
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摘要
Colourless, isophorone di-isocyanate-based ureth:di:one (I) is obtained by (a) reacting isophorone di-isocyanate to a conversion of 10-70% at 0-60 degrees C in the presence or absence of solvent and in presence of 0.2-4 wt% of catalysts of formula P(R3)(R5)R4 (A) and (B), in which R1, R2 = 1-8C alkyl, or R1 + R2 + N = a 5- or 6-membered ring which may contain a CHMe, NMe or O group instead of CH2; R3-R5 = 4-12C (cyclo)alkyl; and then (b) isolating the product as a residue by thin film distillation of the reaction mixture without prior deactivation of the catalyst mixture. Also claimed is the above process for the production of (I). Preferably, the catalyst (A) is tributyl-, trihexyl-, trioctyl- or tridodecyl-phosphine, and catalyst (B) is 4-dimethylaminopyridine or corresponding 4-diethylamino-, 4-pyrrolidino-, 4-piperidino- or 4-(4-methyl-piperidino)-pyridines.
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