| abstract |
The present invention relates to a process for the continuous synthesis of modified diene elastomers comprising at least one silicon atom directly connected to an elastomer chain, comprising the following steps: a) Continuous stirring, provided with an internal stirring system and arranged in series A polymerization step by n reactors r1 to rn considered to be a tank reactor, where n varies from 2 to 15, preferably 2 to 9, and reactor r1 is from solvent, at least one monomer (s), lithium amide An input solution comprising the selected anionic polymerization initiator and the polar agent is supplied, and at least one of the reactors r2 to rn is re-injected with a purified solution comprising the solvent and / or monomer (s) and / or the polar agent. Optionally further fed, the temperature of each reactor varies from 20 ° C. to 150 ° C., preferably from 30 ° C. to 120 ° C., immediately preceding At least the temperature of the group, the temperature of the reactor rn is higher than the temperature of the reactor r1, and the living diene elastomer obtained exhibits a polydispersity index varying from 1.1 to 1.7; And b) modifying the living diene elastomer obtained in the preceding step by a functionalizing agent, a coupling agent or a star-branching agent. |