Heterocyclic thiones are provided as depolarizers in secondary voltaic cells. The cells utilizing the organic depolarizer offer good stability in the uncharged condition nd good recharge characteristics after full discharge. A typical cell is the Leclanche system wherein the manganese dioxide is replaced by 2-imidazolidinethione.
The present invention describes the use of 1,3-disubstituted imidazole-2-thiones as catalysts for crosslinking epoxy functionalized materials with isocyanate functionalized materials. Epoxy/Isocyanate coatings containing these improved catalysts offer the following advantages: excellent pot-life with rapid cure in air at ambient temperatures, control of hardness and toughness of the cured resins, coatings which have a reduced volatile organic content, a curing process which provides clear colorless coatings, and excellent resistance to acids and bases which will improve durability.
