| 摘要 |
In its broadest aspects, the present invention is directed to a tin or bismuth catalyst/mercapto complex as disclosed in U.S. Pat. No. 4,788,083 which catalyst complex exhibits substantially the same stability and activity after extended periods of storage as it exhibits upon initial formation. Such long term storage stability is achieved by restricting the vehicle for the catalyst complex to one that will not react with said mercapto compound upon extended storage of said catalyst system. Advantageous such vehicles include aromatic hydrocarbons and terpenes. Importantly, ketone vehicles are excluded from the catalyst complex formulation. Preferred vehicles include toluene, xylene, turpentine, d-limonene, aromatic petroleum distillates, and mixtures thereof. Corresponding method for forming the stabilized catalyst complex forms yet further aspect of the present invention. As another aspect of the present invention, the present invention is directed to polymercapto resin/polyisocyanate formulations as disclosed in U.S. Pat. No. 4,753,825 which are more stable by dint of the elimination of ketonic and like vehicles that are involved in unintended side reactions with the mercapto content thereof. As a further aspect of the present invention, the cure rate of such polymercapto resin/polyisocyanate formulations can be retarded to commercially accepted levels by blending acrylic resins therewith. Advantageously, the stabilized tin catalyst complexes can be used in the instant controlled cure rate polymercapto resin/polyisocyanate formulations. |
