| 摘要 |
The present invention relates to a catalyst system for olefin polymerization comprising an organic transition metal compound and, as cocatalyst, an ionic compound made up of anions of the formula (Ia), <?in-line-formulae description="In-line Formulae" end="lead"?>[Al(OR<SUP>1</SUP>)<SUB>4</SUB>]<SUP>-</SUP> (Ia)<?in-line-formulae description="In-line Formulae" end="tail"?> where the radicals R<SUP>1 </SUP>are identical or different and are each, independently of one another, a radical R<SUP>2</SUP>R<SUP>3</SUP>(CF<SUB>3</SUB>)<SUB>2</SUB>, R<SUP>2 </SUP>is a carbon or silicon atom and R<SUP>3 </SUP>is hydrogen, C<SUB>1</SUB>-C<SUB>20</SUB>-alkyl, C<SUB>1</SUB>-C<SUB>20</SUB>-fluoroalkyl, C<SUB>6</SUB>-C<SUB>20</SUB>-aryl, C<SUB>6</SUB>-C<SUB>20</SUB>-fluoroaryl, C<SUB>7</SUB>-C<SUB>40</SUB>-arylalkyl, C<SUB>7</SUB>-C<SUB>40</SUB>-fluoroarylalkyl, C<SUB>7</SUB>-C<SUB>40</SUB>-alkylaryl, C<SUB>7</SUB>-C<SUB>40</SUB>-fluoroalkylaryl or an SiR<SUP>4</SUP><SUB>3 </SUB>group, where R<SUP>4 </SUP>may be identical or different and is each C<SUB>1</SUB>-C<SUB>20</SUB>-alkyl, C<SUB>1</SUB>-C<SUB>20</SUB>-fluoroalkyl, C<SUB>6</SUB>-C<SUB>20</SUB>-aryl, C<SUB>6</SUB>-C<SUB>20</SUB>-fluoroaryl, C<SUB>7</SUB>-C<SUB>40</SUB>-arylalkyl, C<SUB>7</SUB>-C<SUB>40</SUB>-fluoroarylalkyl, C<SUB>7</SUB>-C<SUB>40</SUB>-alkylaryl or C<SUB>7</SUB>-C<SUB>40</SUB>-fluoroalkylaryl, and Lewis-acid cations or Brönsted acids as cations. In addition, the invention relates to the process for preparing such a catalyst system and to a process for the polymerization of olefins in which this catalyst system is used.
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