Oxidation resistant natural rubber and a method for its production
AssigneeCooper Tire & Rubber Company
InventorsHoward A. Colvin, Zachary D. Walters
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Abstract
A method for stabilizing a natural rubber such as guayule. The method includes the step of introducing at least one of an Extraction Curves for Guayule Rubber Samples amine and a phenolic anti-oxidant, such as MADA, to a latex form of the rubber under conditions such that the anti-oxidant becomes chemically bound to the rubber. The method includes the further step of subsequently treating the rubber to remove at least a substantial portion of entrained resins. The method can yield a rubber composition of, for example, guayule rubber and including an anti-oxidant chemically bound thereto. The resultant rubber can be suitable for use in tire construction.
Claims17
A method for stabilizing a guayule rubber comprising a first step of (i) combining a non-ionic surfactant with water to form a solution, (ii) homogeneously dispersing MADA in the solution, (iii) introducing the MADA inclusive solution to a latex form of the rubber, and (iv) heating such that the MADA becomes chemically bound to the rubber, a second step of coagulating the rubber, and a subsequent step of continuously treating said rubber to remove at least a substantial portion of entrained resins and achieve a rubber including less than 4% by weight resins.
A method for stabilizing a non-Hevea natural rubber comprising the step of introducing at least one of an amine and a phenolic anti-oxidant to a latex form of the rubber under conditions such that the anti-oxidant becomes chemically bound to the rubber and subsequently treating said rubber with an extraction solvent consisting of acetone to remove at least a substantial portion of entrained resins and achieve a rubber including less than 4% by weight resins and anti-oxidant between greater than 0 and 5% by weight.
A method of preparing guayule rubber comprising first forming a guayule latex, next introducing an antioxidant to said guayule rubber latex for a sufficient time to allow the antioxidant to become chemically bound to the guayule rubber, then coagulating the antioxidant inclusive guayule latex, and finally continuously extracting the coagulated rubber with a polar solvent, said continuously extracting comprising disposing the guayule rubber coagulated from the antioxidant inclusive guayule latex on a porous substrate and continuously introducing a recirculation of the polar solvent.
Dependencies are inferred from the claim text.