US 6,642,382 B2 · Method for obtaining slightly colored branched polyisocyanate(s), and the resulting composition

Abstract

The invention concerns a method for cyclotrimerization of isocyanate functions by action of a catalyst based on quaternary ammonium or phosphonium. The invention is characterised in that said isocyanate functions are branched and said onium ions are selected among those whereof the total amount of carbons is not more than 30 and not less than 12; and whereof the counterion is selected among the anions corresponding to weak acids whereof the pKA is not less than 8, preferably not less than 10, more preferably not less than 12, whereof the substituents are aliphatic compounds and do not have an unsaturation in beta; and said onium ions comprise at least 2 radicals of more than 6, advantageously more than 10, preferably more than 12 carbon atoms.

Claims15

Dependent claims

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.

Dependencies are inferred from the claim text.

Method for obtaining slightly colored branched polyisocyanate(s), and the resulting composition

Life of this patent

Method for obtaining slightly colored branched polyisocyanate(s), and the resulting composition

Life of this patent

Abstract

Claims15