| 摘要 |
The present invention relates to a catalyst system comprising:a) an organoaluminum compound,b) a metal compound selected from subgroups IV to VI of the periodic system,c) a reactivator in a molar ratio of 0.5 to 100 relative to compound b),wherein said reactivator comprises a characterized in that a mono- or dihalocarboxylic acid alkyl ester of the following formula:wherein X is a C1-6 alkyl or C1-6 alkoxy group, Y is Cl, Br or H, Z is Cl or Br and R is a C1-6 alkyl group.
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