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Ethylene/hexene copolymerization with the heterogeneous catalyst system SiO2/MAO/rac-Me2Si[2-Me-4-Ph-Ind]2ZrCl2: The filter effect

✍ Scribed by Christian Przybyla; Bernd Tesche; Gerhard Fink

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 79 KB
Volume: 20
Category: Article
ISSN: 1022-1336
DOI: 10.1002/(sici)1521-3927(19990601)20:6<328::aid-marc328>3.0.co;2-f

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✦ Synopsis

The main focus of this study is the ethylene/hexene copolymerization with the silica supported metallocene SiO 2 /MAO/rac-Me 2 Si[2-Me-4-Ph-Ind] 2 ZrCl 2 . Polymerizations were carried out in toluene at a reaction temperature of 40 8C-608C and the cocatalyst used was triisobutylaluminium (TIBA). The kinetics of the copolymerization reactions (reactivity ratios r E/H , monomer consumption during reaction) were investigated and molecular weights M w , molecular weight distributions MWD and melting points T m were determined. A schematic model for the blend formation observed was developed that based on a filtration effect of monomers by the copolymer shell around the catalyst pellet.

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