| 摘要 |
Compounds of formulas I and II are heat-activated catalysts used in making polyurethanes. <IMAGE> wherein R, R1, and R2 are each independently H, hydrocarbyl or an inertly-substituted hydrocarbyl; R3 and R4 are each independently hydrocarbyl or an inertly-substituted hydrocarbyl; and X is an anion. Upon heating, Compounds I and II catalyze the reaction and may release gaseous by-products which cause the resulting polyurethane compound to foam. For example, the catalyst, t-butyl imidazole-N-carboxylate, when heated to 120 DEG C., catalyzes the reaction between a polyol and a polyisocyanate to give a foamed polyurethane which cured in 16 minutes.
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