FUNCTIONAL DIENE ELASTOMER WITH A LOW PI AND IMPROVED COLD FLOW, AND RUBBER COMPOSITION CONTAINING SAME

摘要

The invention relates to a functionalised diene elastomer consisting of a) a diene elastomer functionalised at the end of the chain or in the middle of the chain by a tin function, having a monomodal molecular mass distribution before functionalisation and a polydispersity index that is less than or equal to 1.3 before functionalisation, b) a diene elastomer that is star-branched with a tin compound and has a monomodal mass distribution before star formation and a polydispersity index that is less than or equal to 1.3 before star formation, and c) a non-functional tin diene elastomer at a rate of less than 15 weight % in relation to the total weight of the functionalised diene elastomer. Said diene elastomers a), b), and c) have the same nature before any functionalisation or star formation.