Ligand effects on olefin polymerizations with multinuclear zirconocene catalysts having dimethylsilylferrocene as a cyclopentadienyl substituent

✍ Scribed by Makoto Mitani; Kunihiro Oouchi; Michiya Hayakawa; Tohru Yamada; Teruaki Mukaiyama

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 402 KB
• Volume: 197
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1996.021970603

✦ Synopsis

Abstract

Olefin polymerizations were conducted with novel multimetallic zirconocene catalyst systems: RCpCpZrCl~2~ (1) (R = dimethylsilylferrocene; Cp = cyclopentadienyl) and (RCp)~2~ZrCl~2~ (2) in combination with methylaluminoxane or tetrakis(pentafluorophenyl) borates. In ethylene polymerization, the maximum catalyst activity was observed at a lower temperature (30–45°C) when using complex 1 or 2, compared with Cp~2~ZrCl~2~. It was also revealed that complex 1 is a more effective catalyst than Cp~2~ZrCl~2~ for copolymerization of ethylene and propene.