Abstract
Abstract Fatty acids react rapidly with zinc oxide to form zinc soaps during milling, and accordingly the action of fatty acid in the presence of zinc oxide is the same as that of an equivalent amount of the corresponding zinc soap. In accelerated stocks, the zinc soaps in the mix react with the accelerator to form the active zinc accelerator compound. The dynamic equilibrium between the accelerator and zinc soaps results in the formation of a smaller amount of the zinc accelerator compound in the case of mercaptobenzothiazole than for many accelerators, and accordingly relatively large amounts of zinc soaps are required with it. Since the zinc reacts with mercapto benzothiazole as the zinc soap, and since there is sufficient time for the reaction between zinc oxide and the fatty acid to proceed to practical completion, irrespective of the particle size of the zinc oxide, it follows that particle size of the zinc oxide is not a factor in the activation of mercaptobenzothiazole.
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