Multistage polymerization process using a catalyst having different catalytically active sites
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United States of America Patent
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Apr 8, 2003
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N/A
app pub date -
Dec 9, 1999
filing date -
Jun 16, 1997
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Expired
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Abstract
The invention relates to a process for the preparation of an olefin polymer wherein olefin polymerization is effected in a plurality of polymerization reaction stages in the presence of an olefin polymerization catalyst material, characterized in that said catalyst material comprises at least two different types of active polymerization sites.
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