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 concerns polymerization accelerators or surface activators for increasing the rate of cure of cyanoacrylate adhesive compositions. The active ingredients of the activators are organic compounds containing a N-C=S or a N=C-S group.
Active substances are stored in pressurized storage systems encapsulated in microcapsules having internal pressure sucfficient to burst the microcapsules, and thus release the other susbtances, upon removal from the system.
