METHOD FOR PRODUCING A RUBBER COMPOSITION
A process for manufacturing a rubber composition which comprises more than 50 phr of a diene elastomer rich in ethylene units, a reinforcing filler comprising a carbon black and a vulcanization system comprising sulfur, a sulfenamide as primary accelerator and a thiuram polysulfide or a mixture of a...
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Format: | Patent |
Sprache: | eng ; fre ; ger |
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Zusammenfassung: | A process for manufacturing a rubber composition which comprises more than 50 phr of a diene elastomer rich in ethylene units, a reinforcing filler comprising a carbon black and a vulcanization system comprising sulfur, a sulfenamide as primary accelerator and a thiuram polysulfide or a mixture of a thiuram polysulfide and a guanidine as secondary accelerator is provided. The process comprises 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, and incorporating the sulfur and the primary accelerator into the rubber composition by kneading at a temperature below 110° C. The process makes it possible to reduce the hysteresis of the vulcanized rubber compositions. |
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