Patent ID: 8455584

Claim:
A process for preparing a block copolymer, of which at least one of said blocks is constituted of a diene elastomer and at least another of said blocks is constituted of a polyether, wherein the process comprises a step of reacting a living diene elastomer with a functionalizing agent of general formula I having a functional polyether block of number-average molecular weight approximately from 100 to 5000 g/mol, in which: R 1 represents a saturated aliphatic hydrocarbon radical of valence m having 1 to 15 carbon atoms, an unsubstituted aromatic hydrocarbon radical of valence m having 6 to 15 carbon atoms or an aryl-substituted saturated aliphatic hydrocarbon radical of valence m having 7 to 15 carbon atoms; R 2 represents a C 1 -C 10 alkylene radical; n is an integer from 2 to 60; m is an integer from 1 to 4; and wherein the living diene elastomer is obtained by anionic polymerization using an organolithium initiator.