PROCESS FOR THE CONTINUOUS POLYMERIZATION OF MODIFIED DIENIC ELASTOMER WITH LITHIUM AMIDIDE INITIATOR

摘要

The invention relates to a process for the continuous synthesis of a modified diene elastomer comprising at least one silicon atom directly connected to the elastomeric chain, comprising: a) a polymerization step by means of n reactors r1 to rn, equipped with an internal stirring system, assumed to be perfectly stirred, arranged in series, n varying from 2 to 15, preferably from 2 to 9, the reactor r1 being fed with an input solution comprising a solvent, one or more monomers, a anionic polymerization initiator selected from lithium amides and a polar agent, one or more of the reactor (s) r2 to rn optionally being further supplied by reinjection of a purified solution comprising solvent and / or monomers and / or polar agent, the temperature of each reactor ranging from 20 to 150 ° C, preferably ranging from 30 to 120 ° C and being greater than or equal to the temperature of the reactor which the p reagent immediately, the temperature of the reactor rn being greater than the reactor temperature r1, the living diene elastomer obtained having a polymolecularity index ranging from 1.1 to 1.7, b) a step of modifying the living diene elastomer obtained in the previous step by means of a functionalizing agent, coupling or starring.