Tin or bismuth complex catalysts and trigger cure of coatings th

Coating processes – With post-treatment of coating or coating material – Chemical agent applied to treat coating

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4273855, 427426, 502152, 502155, 502156, 502168, 502169, 502170, 502216, 502242, 502349, 502353, 521118, 521121, 528 55, 528 58, B01J 3100, B05D 304, C08G 1822

Patent

active

047880830

ABSTRACT:
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. Advantageusly, the polyol and polyisocyanate both are aliphatic.

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