Metallocene catalyst systems with sterically hindered Lewis-base

摘要

Catalyst systems for the polymerisation of olefinically unsaturated compounds, containing (A) a metallocene complex of a Sub-Group 4, 5 or 6 metal, (B) a metallocenium ion-forming compound and (C) a sterically hindered organic Lewis base. Also claimed is a process for the production of polymers by linking at least two unsaturated monomers at 0-450 degrees C and 0.1-500000 kPa in presence of a catalyst system as above. Preferably component (B) is a 1-10C aluminoxane, and component (C) is a sterically hindered hydroxyaryl or aryloxyaluminium compound, preferably a phenol, naphthol or hydroxyanthracene derivative in which the ring positions directly adjacent to the hydroxy or aluminoxy groups are substituted with bulky groups.