| 摘要 |
<p>The invention concerns a linear or branched diene elastomer having cyclic vinyl units. The inventive linear diene elastomer is derived at least from a conjugated diene, and comprises cyclic vinyl units in a weight proportion not less than 15 % while having an average number mole weight ranging between 10000 and 300000 g/mole. The invention also concerns a method for preparing such a linear or branched diene elastomer comprising cyclic vinyl units in said proportion and having an average number mole weight ranging between 10000 and 300000 g/mole, said method comprising continuously reacting at least a conjugated diene monomer in an inert aliphatic or alicyclic hydrocarbon solvent with a catalytic system comprising an organolithium initiator, a polar agent with several heteroatoms and an alkaline metal salt of an aliphatic or alicyclic alcohol, wherein: (i) the mol ratio (polar agent/initiator) is not less than 3; (ii) the mol ratio (salt/initiator) ranges between 0.01 and 2; (iii) the mol ratio (salt/polar agent) ranges between 0.001 and 0.5.</p> |
