Conjugated diene polymerisation

  • US 5,686,371 A
  • Filed: 08/10/1994
  • Issued: 11/11/1997
  • Est. Priority Date: 09/09/1991
  • Status: Expired due to Term
First Claim
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1. A process for the catalytic polymerization of at least one conjugated diene by a catalyst comprising a rare earth salt, an organo aluminium cocatalyst and a source of halogen, said process comprising the steps of:

  • (a) preparing said catalyst by bringing together, in a liquid hydrocarbon medium and in the presence of a portion of at least one conjugated diene (i) a rare earth salt, (ii) an organo aluminium compound and (iii) as the source of halogen, a silicon halide or organosilicon halide;

    (b) aging said catalyst; and

    (c) polymerizing at least one conjugated diene in the presence of the catalyst of step (b).

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