| 摘要 |
A catalyst, suitable for use in polyurethane compositions comprises the reaction product of: (a) the reaction product of a titanium, zirconium, hafnium or aluminium orthoester and a beta -diketone or beta -ketoester and (b) a complexing agent selected from a mercapto compound, an oxazolidine or a tetrahydro-oxazine. The catalyst is particularly useful for preparing coating compositions which have a long pot life and can be cured at room temperature. |
