Patent ID: 6653432
Filing Date: 2003-11-25
Classification: C08G

Abstract:
A method for the (cyclo)trimerisation of isocyanates having at least two isocyanate functions, comprising:a) reacting initial isocyanate monomers having at least two isocyanate functions, optionally in the presence of other monomers reactive with the isocyanate monomers having at least two isocyanate functions, at a temperature of at least 20Â° C., and lower than 200Â° C., in the presence of a compound comprising at least one rare earth alcoholate function, b) stopping the reaction by inactivating the catalyst or its derivative forms in the reaction medium at a transformation rate of at least 2.5% and at most 90% of the initial isocyanate functions; and optionally c) distilling the reaction medium to eliminate the unreacted monomers.