Catalytic cyclotrimerization of polyisocyanates
AssigneeRhone-Poulenc Specialites Chimiques
InventorJean Robin
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Abstract
Polyisocyanato-polyisocyanurates are prepared by catalytically cyclotrimerizing a polyisocyanate in the presence of a catalytically effective amount of an aminosilyl catalyst, and which is characterizing by terminating the cyclotrimerization reaction when a predetermined desired amount of isocyanurate groups has been obtained, by adding to the reaction mixture a reaction terminating amount of an organic catalyst deactivating compound comprising at least one free hydroxyl moiety, or the reaction product of such hydroxylated organic catalyst deactivating compound with an isocyanate.
Claims11
A process for the preparation of a polyisocyanato-polyisocyanurate, comprising catalytically cyclotrimerizing an aliphatic or cycloaliphatic polyisocyanate in the presence of a catalytically effective amount of an aminosilyl catalyst, and further comprising terminating the cyclotrimerization reaction when a predetermined desired amount of isocyanurate groups has been attained, by adding to the reaction mixture a reaction terminating amount of an organic catalyst deactivating compound comprising at least one free hydroxyl moiety, or the reaction product of such hydroxylated organic catalyst deactivating compound with an isocyanate.
Dependencies are inferred from the claim text.