Patent ID: 6706913
Filing Date: 2004-03-16
Classification: C07C

Abstract:
A process for preparing a (cyclo)aliphatic diisocyanate or triisocyanate corresponding to the formulaRâ€”(NCO)nâ€ƒâ€ƒ(I), whereinR represents a (cyclo)aliphatic hydrocarbon group having up to 15 carbon atoms, provided that there are at least two carbon atoms between two nitrogens, n represents the number 2 or 3, by a) separately heating phosgene and a diamine or triamine corresponding to the formula Râ€”(NH2)nâ€ƒâ€ƒ(II), â€ƒto a temperature of 200Â° C. to 600Â° C., wherein the amine may optionally be diluted with an inert gas or with the vapors of an inert solvent, b) accelerating the flow of at least one of reactants in the region where the reactants are mixed and c) continuously reacting the reactants in a reaction chamber that does not have moving parts.