Novel catalysts for preparation of polyurethanes

Abstract From the Canadian patent

Novel catalyst compositions comprising complexes of tin (IV) salts and amine compounds are used to prepare polyurethanes, polyureas, polycarbodiimides and polyisocyanurates. The complexes which preferably employ primary amines allow de-, lay of gelation until they dissociate under certain reaction conditions. The complexes can be prepared neat or in situ in an active, hydrogen containing formulation component. The complexes serve to delay gelation of the formulation because they are relatively stable to moisture and will predictably dissociate upon heating either as a result of the exothermic nature of the reaction being catalyzed or with application of an external heat source. The catalyst …