Abstract
Two new C 1-symmetric zirconocenes of the type [Me 2C(3-RCp)(Flu)]ZrCl 2 bearing a phenyl (Ph) or a cyclohexyl (cHex) substituent on the cyclopentadienyl ring were synthesized. Copolymerizations of ethene and styrene were carried out using these catalysts and compared to the results obtained with the methyl- and tert butyl-substituted as well as with the unsubstituted system. By the introduction of the phenyl substituent both the activities and the molar masses could be increased whilst the styrene incorporation was comparable to that achieved with the unsubstituted system. In the case of the alkyl substituted systems (R=Me, tert Bu, cHex) the styrene incorporation is decreased drastically and molar masses and activities are also strongly effected.
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