Gas phase polymerization of olefins
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United States of America Patent
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Feb 15, 2000
Issued Date -
N/A
app pub date -
Jun 3, 1996
filing date -
Aug 31, 1989
priority date (Note) -
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Abstract
A gas phase fluidized bed process is described for producing ethylene polymers having improved processability and an MWD of less than about 2.9. Multiple reactors in series or parallel may be used to produce in-situ blended polymers. Each reactor can separately have a constrained geometry catalyst or a conventional Ziegler-Natta catalyst as needed for obtaining in-situ blended polymer with the desired properties as long as there is a constrained geometry catalyst in at least one reactor. Olefin polymers can be produced according to this invention which have low susceptibility to melt fracture, even under high shear stress conditions.
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