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Comparison of Olefin Polymerization Processes with Metallocene Catalysts
Author(s) -
Kaminsky Walter,
Müller Fabian,
Sperber Oliver
Publication year - 2005
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.200400285
Subject(s) - metallocene , materials science , polymerization , post metallocene catalyst , catalysis , olefin fiber , polymer , molar mass , polymer chemistry , olefin polymerization , phase (matter) , chemical engineering , organic chemistry , composite material , chemistry , engineering
Summary: Solution and gas phase processes of the polymerization of ethene are compared using new types of pentalenyl bridged ansa ‐metallocenes such as [Me 3 Pen(Flu)]ZrCl 2 . As of the bridge, the catalyst system is remarkable thermostable up to 105 °C and a deactivation of the metallocene on the silica support can be suppressed. Compared to the non‐supported catalyst in a solution process, the application of the heterogenized system in a gas phase process leads to a decrease in activities while molar masses of the polyethenes are similar. Due to a higher degree of short chain branches of 20–30 per 1 000 carbon atoms instead of 10–17, the melting temperatures are 10 °C lower than those for polymers obtained in the solution process.Basic structure of the here used pentalenyl bridged ansa ‐metallocenes.