New catalyst with superior hydrolytic stability for polyurethane and organosilane applications

 
Bismuth carboxylates can be effective alternatives to tin catalysts for accelerating the reaction of polyols with polyisocyanates. A serious drawback of bismuth carboxylates is their poor hydrolytic stability. Methods for improving the hydrolytic stability of bismuth carboxylate catalysts usually result in a corresponding decrease in activity. A unique bismuth catalyst has been developed that has excellent hydrolytic stability compared to conventional bismuth carboxylates. This new versatile catalyst is an effective accelerator for a variety of urethane applications and in addition shows efficacy in organosilane applications. Addressing potential regulatory labeling concerns, this new bismuth catalyst is tin-free and contains no 2-ethylhexanoic acid in the form of a free acid or as the metal carboxylate.