| 摘要 |
<p>A catalyst composition comprising a first component which is a substituted bis(cyclopentadienyl)titanium, zirconium or hafnium compound, also containing a substituent which is attached to the metal and which is capable of reacting with a cation and a second component which is a compound having a bulky and labile anion which is substantially non-coordinating under the reaction conditions and a cation, wherein the substituted bis-cyclopentadienyl ligand pair is bis-tetramethylcyclopentadienyl.</p> |
