A New Sulfur Modified Polychloroprene

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Abstract
Among commercial polychloroprenes, mercaptan modified types cured with thioureas have yielded vulcanizates with the best heat aging and compression set properties. In contrast, sulfur modified polychloroprenes have been inferior in these properties, but superior in hot strength, resilience, and resistance to flexing and tear. In the past the polychloroprene user was forced to choose between the two contradictory sets of properties. A new sulfur modified polychloroprene has been developed which eliminates this compromise. The new product can be cured with metal oxides alone. The vulcanizates have better tear strength than previously obtainable; resilience, flex resistance, and heat aging equal to the best previous; and compression set resistance approaching that of mercaptan modified polychloroprene cured with thioureas. This combination of properties was not available heretofore. Although accelerators are not normally required, the cure cycle of the new polychoroprene product can be modified by conventional techniques.

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