Synthesis of a dinuclear ansa-zirconocene catalyst having a biphenyl bridge and application to ethene polymerization

✍ Scribed by Kazuo Soga; Hoang The Ban; Toshiya Uozumi

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 139 KB
• Volume: 128
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/s1381-1169(97)00180-5

✦ Synopsis

Ž Ä w Ž . x 4 . Ž . A novel dinuclear ansa-zirconocene catalyst m-C H SiPh Ind ZrCl I was prepared by a Wurtz coupling 12 8 2 2 2 reaction between two equivalent of bisindenylphenylchlorosilane and one equivalent of 4,4 X -dibromobiphenyl in THF at reflux temperature for 12 h, followed by a successive reaction with ZrCl P 2THF in THF at y788C. Polymerization of 4 ethene was conducted in a 300 cm 3 glass reactor equipped with a stirrer at 40, 60, 80 and 1008C using MAO or w Ž . x Ž . Ph C B C F as cocatalyst and toluene as the solvent. The catalyst I gave linear polyethene with a broader molecular 3 6 54 Ž . mass distribution MMD in a much higher yield as compared to the corresponding mononuclear catalyst derived from w Ž . x Ž . Ph Si Ind ZrCl II . The apparent activity increased monotonously from 408C up to 1008C. The replacement of MAO 2 2 2 w Ž . x with Ph C B C F gave polyethene with a higher molecular weight. q 1998 Elsevier Science B.V.