Preparation process of a dienic elastomer using anionic...

C - Chemistry – Metallurgy – 08 – F

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C08F 297/04 (2006.01) C08F 36/04 (2006.01) C08F 136/06 (2006.01) C08F 236/10 (2006.01)

Patent

CA 2359197

The present invention provides a process for the preparation of a diene elastomer having a reduced amount of vinyl linkages, by anionic polymerization of one or more monomers comprising at least one conjugated diene monomer. The process for preparing the diene elastomer having a reduced amount of vinyl linkages comprises anionically polymerizing one or more monomers comprising at least one conjugated diene monomer in a polymerization medium comprising a hydrocarbon solvent, a polar agent comprising one or more heteroatoms and a monolitiated or polylithiated organolithiated initiator, wherein an organometallic complex of the formula LiAl(R) 3 (R'), in which Li is a lithium atom, Al is an aluminum atom, and R and R' are each an alkyl, cycloalkyl or aryl group, is added to the polymerization medium to produce the diene elastomer having a reduced amount of vinyl linkages.

La présente invention concerne un procédé de préparation d'un élastomère diénique présentant un taux réduit d'enchaînements vinyliques, par polymérisation anionique d'un ou de plusieurs monomères comprenant au moins un monomère diène conjugué. Un procédé de préparation selon l'invention d'un élastomère diénique par polymérisation anionique d'un ou de plusieurs monomères comprenant au moins un monomère diène conjugué, consistant à faire réagir dans un solvant hydrocarboné: ledit ou lesdits monomères, un agent polaire comportant un ou plusieurs hétéroatomes, et un initiateur organolithié de type monolithié ou polylithié, est tel qu'il consiste à ajouter audit agent polaire un complexe organométallique répondant à la formule LiAl(R)3(R') pour réduire ledit taux d'enchaînements vinyliques dans ledit élastomère, où Li est un atome de lithium, Al un atome d'aluminium, et R et R' sont chacun un groupe alkyle, cycloalkyle ou aryle.

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