| 摘要 |
A catalyst composition comprising a metallocene of a group 4 metal and an alumoxane is disclosed. The alumoxane is composed of both methylalumoxane and bulky alkoxyalumoxane monomers in the same polymeric alumoxane compound. Examples of the bulky alkoxy group of the alumoxane include di- and trisubstituted aliphatic carbon atoms, e.g., triphenylmethoxy, diphenylmethoxy, 1,3,3-trimethyl-2-norbornanyloxy. These mixed alumoxanes are made by either reacting MAO with the corresponding bulky alcohol, or by reacting the bulky alcohol with TMA followed by hydrolysis. |
