It was found that dithiocarbamate accelerators, e.g.metal dithiocarbamate, metal dithiophosphate, metal alkylxanthate, amine salt of dithiocarbamic acid, with a combination of thiazole accelerators such as MBTS, OBS, serve as vulcanizing agent in nonsulfur curing system of natural rubber even in the absence of zinc oxide, and the compound has processing safety, flat curing characteristic.
Metal salts of cyclic (bisdithiocarbamic acid) also have the same characteristic in the presence of thiazole accelerators, and the compound has repid cure rate, flat curing characteristic.
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