Metallocene catalysts containing a cyclopentadienyl ligand substituted by a siloxy or germiloxy group containing an olefinic residue

摘要

The invention relates to a metallocene catalyst in which the metal is coordinated by any η⁵ cyclopentadienyl ligand characterised in that said ligand is directly or indirectly substituted by a pendant siloxy or germyloxy group which contains an olefinic residue.