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AssigneeMichelin Recherche et Technique S.A.
InventorSylvie Gandon-Pain
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A process for obtaining a grafted diene elastomer having functional groups along the chain, a rubber composition containing this grafted elastomer and having in particular improved hysteresis properties in the cross-linked state, a preparation process for this composition, a tire tread made from this composition and a tire of reduced rolling resistance which incorporates this tread. A process for obtaining this grafted elastomer includes a radical grafting reaction carried out in solution or without a solvent by means of a reagent of the mercaptan type to graft functional groups on to the chain of a starting elastomer. The starting elastomer is treated with an antioxidant having at least one aromatic amine function before the grafting reaction, so that the grafted elastomer has a macrostructure which is practically identical to that of the starting elastomer. A rubber composition containing the grafted diene elastomer includes a reinforcing inorganic filler, and the grafted elastomer preferably has a molar ratio of units originating from conjugated dienes greater than 30%.
A process for obtaining a grafted diene elastomer comprising functional groups along its chain, said process comprising a radical grafting reaction which is performed in solution or without a solvent by means of a mercaptan reagent having at least one functional group and which is intended to graft said groups on to the chain of the starting elastomer, wherein said process comprises a step of antioxidant treatment before said radical grafting reaction, by means of an antioxidant comprising at least one aromatic amine function.
Dependencies are inferred from the claim text.