NOVEL CATALYSTS FOR PREPARATION OF POLYURETHANES

摘要

Novel catalyst compositions comprising complexes of tin (IV) salts and amine compounds are used to prepare polyure- thanes, polyureas, polycarbodiimides and polyisocyanurates. The complexes, w hich 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 gela tion of the formulation because they are relative- ly stable to moisture and will predictably dissociate upon heating, either a s a result of the exothermic nature of the reaction bein g catalyzed or with application of an external heat source. The catalyst compo sitions are particularly useful for preparation of car- pet underlay and in other applications requiring significant delay prior to gelation.