| 摘要 |
The use of a concentrated alumoxane solution as cocatalyst for the polymerization of olefins with a homogeneous metallocene-type catalyst of formula (Cp)mRnMQk, wherein Cp is a substituted or unsubstituted metallocene, R is an optional structural bridge between two Cp rings, M is a transition metal from groups 4 and 5, Q is H or alkyl or alkenyl or halogen, m=1-3, n=0 or 1 and m+k equals the oxidation state of M, provides better yields at lower Al/M ratio. Also provided are a homogeneous catalyst system, a process for preparing same, and a process for the polymerization of olefins, preferably to produce syndiotactic polypropylene. |
