Polymerization process
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United States of America Patent
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Oct 9, 2001
Issued Date -
N/A
app pub date -
Jul 31, 1997
filing date -
Apr 7, 1994
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Abstract
A process for preparing polyolefins having at least 0.01 long chain branches (LCB)/1000 carbon atoms along the polymer backbone as measured by flow activation and a molecular weight distribution greater than 2.5 comprises polymerization in the presence of a metallocene complex having the formula: ##STR1## wherein Cp.sup.1, Cp.sup.2 are independently a substituted or unsubstituted indenyl or hydrogenated indenyl group, Y is a univalent anionic ligand, M is zirconium, titanium or hafnium, and Z is a bridging group comprising an alkylene group having 1 to 20 carbon atoms or a dialkyl silyl- or germyl- group, or alkyl phophine or amine radical. Polyolefins prepared from such a process show specific flow activation energy/LCB relationships.
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