Patent ID: 6642382
Filing Date: 2003-11-04
Classification: C07D

Abstract:
Process for cyclotrimerizing isocyanate functional groups by the action of a quaternary-ammonium- or quaternary-phosphonium-based catalyst, characterized in that said isocyanate functional groups are branched and in that said oniums are chosen from those of which the sum of the carbons is at most equal to 30 and at least equal to 12; of which the counterion is chosen from anions corresponding to weak acids whose pKA is at least equal to 8, preferably 10 and more preferably 12; of which the substituents are aliphatic and do not possess unsaturation in the beta position; and in that said oniums comprise at most 2 radicals of more than 6, advantageously more than 10 and preferably more than 12 carbon atoms.