Technical documentation

Le sulfate de bis (triméthylsilyle) composé aisément accessible, permet d'introduire le groupe sulfonique dans des dérivés fonctionnels tels que les éthers aromatiques, les chlorures et anhydrides d'acides aliphatiques, sans qu'il y ait de modifications notables de la fonction considerée. Dans le cas d'in chlorure d'acide alpha-chloré, on observe cependant une disulfonation accompagnée de decarboxylation.

The disclosed compounds are adducts of imidazole or derivatives thereof and sulfur dioxide. The adducts are apparently of the Lewis acid - Lewis base type, and are useful as latent curing agents for epoxide resins. The adducts are prepared by interacting the imidazole and sulfur dioxide under anhydrous conditions. Equimolar imidazole-SO2 adducts can serve as a source of sulfur dioxide at room temperature.

This invention relates to a process for curing polyepoxides. More particularly, this invention relates to a new process for curing polyepoxides, to novel curing agents used in the process, and to useful products obtained from the process.

The disclosed compounds are adducts of imidazole or derivatives thereof and sulfur dioxide. The adducts are apparently of the Lewis acid-Lewis base type, and are useful as latent curing agents for epoxide resins. The adducts are prepared by interacting the imidazole and sulfur dioxide under anhydrous conditions. Equimolar imidazole--SO.sub.2 adducts can serve as a source of sulfur dioxide at room temperature.