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Polymerization of ethylene by using zirconocene catalyst anchored on silica with trisiloxane and pentamethylene spacers

✍ Scribed by Dong-ho Lee; Keun-byoung Yoon; Seok-kyun Noh

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 221 KB
Volume: 18
Category: Article
ISSN: 1022-1336
DOI: 10.1002/marc.1997.030180510

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✦ Synopsis

Abstract

New supported catalysts on the basis of cyclopentadienylindenylzirconium dichloride (CpIndZrCl~2~) anchored on silica with a trisiloxane spacer (ZATS) and a pentamethylene spacer (ZAPM) were prepared and used for ethylene polymerization with modified methylaluminoxane (MAO) as cocatalyst. ZATS and ZAPM produce polyethylene with lower molecular weight but show higher activity than silica‐supported CpIndZrCl~2~ which was prepared by reacting zirconocene directly with silica, i.e., the activity of silica‐supported CpIndZrCl~2~ is enhanced by introducing a spacer between silica surface and metallocene species.

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Ethylene polymerization initiated by anchored CpIndZrCl2 on silica with hexamethyltrisiloxane and pentamethylene spacers

✍ Dong-Ho Lee; Hun-Bong Lee; Seok Kyun Noh; Byung Kyu Song; Sah Mun Hong 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 247 KB

For ethylene polymerization, the supported metallocene catalyst was prepared by anchoring CpIndZrCl 2 on silica with an appropriate spacer. The three procedures were applied for CpIndZrCl 2 anchoring on silica with a hexamethyltrisiloxane or pentamethylene spacer. The anchoring procedures exerted a