PREFORMED CATALYTIC SYSTEM COMPRISING A RARE-EARTH METALLOCENE

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The present invention relates to a catalytic system made of at least one preforming monomer which is ethylene or a mixture of ethylene and a conjugated diene, a metallocene of formula{P(Cp1)(Cp2)Y} or Cp3Cp4Y, an organometallic compound as a co-catalyst, Y designating a group comprising a rare-earth metal atom, the groups Cp1, Cp2, Cp3 and Cp4, identical or different, being selected from the group made up of the fluorenyl groups, the cyclopentadienyl groups and the indenyl groups, the groups being optionally substituted, P being a group bridging the two groups Cp1 and Cp2, and comprising a silicon or carbon atom. Such a catalytic system has improved stability of the catalytic activity over time, in particular during storage.