Tin or bismuth complex catalysts and trigger cure of...

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B01J 31/12 (2006.01) B01J 23/14 (2006.01) B01J 23/18 (2006.01) C08G 18/08 (2006.01) C08G 18/16 (2006.01) C08G 18/18 (2006.01) C08G 18/22 (2006.01)

Patent

CA 1303015

TIN OR BISMUTH COMPLEX CATALYSTS AND TRIGGER CURE OF COATINGS THEREWITH ABSTRACT OF THE DISCLOSURE Disclosed is an activatable catalyst which is effective for the reaction of a hydroxyl compound and an isocyanate. Preferably, the catalyst is utilized in the cure of a coating composition of a polyol and a polyisocyanate. The activatable catalyst is activated in the presence of an amine activator or heat and comprises the reaction product of a metal catalyst selected from a tin catalyst, a bismuth catalyst, and mixtures thereof; and a molar excess of a complexing agent. The complexing agent is selected from a mercapto compound, a polyphenol characterized by being reactable with an isocyanate group in the presence of a tertiary amine activator, and mixtures thereof. A single polyol resin may bear both the complexing functionality and the activatable catalyst. Advantageously, the polyol and polyisocyanate both are aliphatic. -62-

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