Rubber compositions containing polymeric phenol derivatives of 1,3,4-thiadiazole
AssigneeR. T. Vanderbilt Company, Inc.
InventorLester A. Doe, Jr.
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Abstract
A process is disclosed for stabilization of natural rubber against oxidative degradation by incorporating therein phenolic derivatives of 3-hydroxymethyl-5-hydroxymethylthio-1,3,4-thiadiazolidine-2-thione and stabilized rubber compositions thereof.
Claims2
A stabilized composition comprising natural rubber and about 0.2 to 5 parts per hundred parts rubber of a polymeric reaction product of 4,4'-(1-methylethylidene)bisphenol and 3-hydroxymethyl-5-hydroxymethylthio-1,3,4-thiadiazolidine-2-thione wherein the molar ratio of the bisphenol to the thione is about 1:1 to 2:1.
A process for stabilizing rubber against oxidative degradation which comprises incorporating in the rubber about 0.2 to 5.0 parts per hundred parts rubber of a polymeric reaction product of 4,4'-(1-methylethylidene)bisphenol and 3-hydroxymethyl-5-hydroxymethylthio-1,3,4-thiadiazolidine-2-thione wherein the molar ratio of the bisphenol to thione is about 1:1 to 2:1.
Dependencies are inferred from the claim text.