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Pentalene substituted metallocene complexes for olefin polymerization

✍ Scribed by Walter Kaminsky; Oliver Sperber; Ralf Werner

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
265 KB
Volume
250
Category
Article
ISSN
0010-8545

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✦ Synopsis

Pentalene bridged zirconocene/methylaluminoxane catalysts are described as useful for the polymerization of ethene, propene, and copolymerizations with norbornene. They show a high thermostability up to polymerization temperatures of 105 β€’ C. Polyethylenes with molecular masses of 4 million g/mol are obtained at 30 β€’ C and 500,000 g/mol at more than 90 β€’ C. The molecular mass distribution varies between 2 and 15 because of the steric isomers of the pentalene ligand. Some of the complexes are active for the polymerization of propene. Similar to ansa cyclopentadienyl-fluorenyl complexes, the tacticity of the produced polypropylenes can be changed from syndiotactic to isotactic by substitution of the cyclopentadienyl ring.

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