Catalyst and method for trimerization of isocyanates

Details Catalyst and method for trimerization of isocyanates Catalyst and method for trimerization of isocyanates

C - Chemistry, Metallurgy

08

G

C08G 18/02 (2006.01) B01J 31/02 (2006.01) C08G 18/18 (2006.01) C08G 18/20 (2006.01) C08G 18/38 (2006.01)

Patent

CA 2307747

The invention concerns the use as cyclotrimerization reaction catalyst of isocyanates of a cation hydrogen carbonate which, either as such, or in complexed form with a complexing agent, has an ionic or molecular radius greater than 1 .ANG., preferably than 1.5 .ANG. and which is at least partially soluble in the reaction medium. The invention also concerns a method for preparing polyisocyanates (poly)isocyanurates by catalytic cyclotrimerization of isocyanates which consists in using a catalytic system comprising as catalyst a cyclotrimerization catalyst based on quaternary ammonium salt with imidazole as co-catalyst.

Cette invention concerne l'utilisation en tant que catalyseur de réaction de cyclotrimérisation d'isocyanates d'un hydrogénocarbonate d'un cation qui, soit en tant que tel, soit sous forme complexée avec un agent complexant, a un rayon ionique ou moléculaire moyen supérieur à 1 .ANG., de préférence à 1,5 .ANG. et qui est au moins partiellement soluble dans le milieu réactionnel. L'invention concerne également un procédé de préparation de polyisocyanates (poly)isocyanurates par cyclotrimérisation catalytique d'isocyanates dans lequel on utilise un système catalytique comprenant en tant que catalyseur un catalyseur de cyclotrimérisation à base d'un sel d'ammonium quaternaire et comme co-catalyseur l'imidazole.

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