Abstract
Abstract (1) Deterioration accelerated by copper in a high-grade tread stock, a low-grade tread stock, a high zinc oxide bus-tube stock, and a pure-gum stock has been found to be effectively retarded by the use of suitable antioxidants. (2) Secondary aromatic amines have been found to be much more effective than other antioxidants, in tread stocks, for retarding deterioration due to copper. (3) The degree of protection afforded to rubber compounds containing copper by the use of certain antioxidants, notably secondary aromatic amines, is sufficiently high to make their addition of practical importance.
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