| 摘要 |
The present invention generally relates to a catalyst system. The catalyst system can include a metal dioxide of titanium dioxide or hafnium dioxide, as well as a cocatalys of the general formula (IV) or (V):where:M' is Al, Ca, Na, K, Si or Mg,s is an integer from 1 to 4 and is the oxidation state of the metal,R is alkyl having 1 to 10 C atoms or aryl having 6 to 20 C atoms, andX is F, Cl, Br, CN; or the general formulae(CH3)2Clsi(CH2)2SiCl(CH3)2(CH3)2ClSi(CH2)3CN[(CH3)3Si]2O[(CH3)3Si]2NH or[(CH3)3Si]2.
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