US 12,479,942 B2
Method for producing a rubber composition
Etienne Fleury, Clermont-Ferrand (FR); and Julien Cladiere, Clermont-Ferrand (FR)
Assigned to COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, Clermont-Ferrand (FR)
Appl. No. 17/910,449
Filed by COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, Clermont-Ferrand (FR)
PCT Filed Mar. 9, 2021, PCT No. PCT/FR2021/050395
§ 371(c)(1), (2) Date Sep. 9, 2022,
PCT Pub. No. WO2021/181040, PCT Pub. Date Sep. 16, 2021.
Claims priority of application No. 2002364 (FR), filed on Mar. 10, 2020.
Prior Publication US 2023/0128470 A1, Apr. 27, 2023
Int. Cl. C08F 236/06 (2006.01); C08F 210/02 (2006.01); C08K 3/04 (2006.01); C08K 3/06 (2006.01); C08K 5/31 (2006.01); C08K 5/372 (2006.01); C08K 5/44 (2006.01)
CPC C08F 236/06 (2013.01) [C08F 210/02 (2013.01); C08K 3/04 (2013.01); C08K 3/06 (2013.01); C08K 5/31 (2013.01); C08K 5/3725 (2013.01); C08K 5/44 (2013.01)] 20 Claims
 
1. A method for producing a rubber composition which comprises a highly saturated diene elastomer, a reinforcing filler comprising a carbon black and a vulcanizing system comprising sulfur and a vulcanization accelerator,
the highly saturated diene elastomer being a copolymer of ethylene and of a 1,3-diene containing ethylene units which represent at least 50 mol % of the monomer units of the copolymer,
the content of the highly saturated diene elastomer in the rubber composition being greater than 50 phr,
the vulcanization accelerator being a mixture of a primary accelerator and of a secondary accelerator,
the primary accelerator being a sulfenamide, the secondary accelerator being a thiuram polysulfide or a mixture of a thiuram polysulfide and a guanidine,
which process comprises a step a) followed by a step b):
a) mixing the highly saturated diene elastomer, the reinforcing filler and the secondary accelerator by kneading at a temperature above 110° C., in the absence of the sulfur and the primary accelerator,
b) incorporating the sulfur and the primary accelerator into the rubber composition by kneading at a temperature below 110° C.