US 11,053,326 B2
Oxidation resistant natural rubber and a method for its production
Howard A. Colvin, Wayne, OH (US); and Zachary D. Walters, Findlay, OH (US)
Assigned to Cooper Tire and Rubber Company, Findlay, OH (US)
Appl. No. 15/509,630
Filed by COOPER TIRE & RUBBER COMPANY, Findlay, OH (US)
PCT Filed Sep. 10, 2015, PCT No. PCT/US2015/049469
§ 371(c)(1), (2) Date Mar. 8, 2017,
PCT Pub. No. WO2016/040665, PCT Pub. Date Mar. 17, 2016.
Claims priority of provisional application 62/049,943, filed on Sep. 12, 2014.
Prior Publication US 2017/0247477 A1, Aug. 31, 2017
Int. Cl. C08C 19/22 (2006.01); C08K 5/00 (2006.01); B60C 1/00 (2006.01); C08C 1/02 (2006.01); C08K 5/18 (2006.01); C08K 5/375 (2006.01); C08F 136/08 (2006.01); C08C 19/20 (2006.01); C08L 7/02 (2006.01); C08C 1/14 (2006.01); C12N 9/88 (2006.01)
CPC C08C 19/22 (2013.01) [B60C 1/00 (2013.01); C08C 1/02 (2013.01); C08C 1/14 (2013.01); C08C 19/20 (2013.01); C08F 136/08 (2013.01); C08K 5/005 (2013.01); C08K 5/18 (2013.01); C08K 5/375 (2013.01); C08L 7/02 (2013.01); C12N 9/88 (2013.01); C12Y 402/01092 (2013.01)] 17 Claims
 
1. 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.