US 11,674,024 B2
Sequential, double elastomer vulcanization system, method and composition
Shushuang Li, Shanghai (CN); and Sudhin Datta, Houston, TX (US)
Assigned to ExxonMobil Chemical Patents Inc., Baytown, TX (US)
Filed by ExxonMobil Chemical Patents Inc., Baytown, TX (US)
Filed on May 10, 2021, as Appl. No. 17/315,907.
Claims priority of provisional application 63/032,188, filed on May 29, 2020.
Prior Publication US 2021/0371633 A1, Dec. 2, 2021
Int. Cl. C08L 23/08 (2006.01); C08L 23/16 (2006.01); C08L 9/00 (2006.01); C08J 3/24 (2006.01)
CPC C08L 23/0815 (2013.01) [C08J 3/243 (2013.01); C08J 3/245 (2013.01); C08L 23/16 (2013.01); C08F 2810/20 (2013.01); C08L 9/00 (2013.01); C08L 2205/03 (2013.01)] 33 Claims
OG exemplary drawing
 
1. A sequential, double-vulcanization method, comprising the steps of:
(a) mixing first and second immiscible elastomers together with a first additive package comprising component(s) of a first curative system, and optionally component(s) of a first plasticizer system, or component(s) of a first filler system, or a combination thereof;
(b) activating the first curative system to vulcanize the first elastomer in a dispersed phase of the first elastomer to form a partially vulcanized mixture while maintaining melt flowability of the second elastomer in a continuous phase;
(c) optionally, mixing the partially vulcanized mixture together with a second additive package comprising component(s) of a second curative system, component(s) of a second plasticizer system, component(s) of a second filler system, or a combination thereof; and
(d) vulcanizing the second elastomer in the continuous phase by radiation or by activating a chemical curative in the second curative system.