Single catalyst low, medium and high density polyethylenes
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United States of America Patent
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May 29, 2007
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app pub date -
May 22, 2006
filing date -
Jun 14, 2005
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Abstract
A method of polymerizing olefins comprising combining in one embodiment ethylene and optionally one or more .alpha.-olefins with a catalyst composition in a continuous polymerization reactor at a pressure of less than 10,000 kPa; wherein the catalyst composition comprises a hafnocene; and isolating a polyethylene having a density in the range of from 0.930 to 0.975 g/cm.sup.3. Also provided is a method of transitioning a continuous polymerization reactor from production of a low density polyethylene to a medium or high density polyethylene. Also provided is a medium to high density polyethylene suitable for injection or rotomolding applications. Also provided is a single catalyst composition suitable for such needs.
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