Polymer products and multi-stage polymerization processes for the production thereof
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United States of America Patent
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Aug 1, 2017
Grant Date -
Jan 14, 2016
app pub date -
Feb 21, 2014
filing date -
Mar 15, 2013
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Abstract
Multi-stage polymerization processes that produce polymers having controlled compositions and molecular weight with improved catalyst productivity are disclosed. An example method for producing a multi-modal polyolefin comprises polymerizing the multi-modal polyolefin in the presence of a metallocene catalyst system in at least a slurry-phase polymerization stage and a gas-phase polymerization stage arranged in series in any order, wherein the multi-modal olefin comprises: (i) a first polyolefin fraction having a density of less than about 940 kg/m3, and (ii) a second polyolefin fraction having a density of less than about 930 kg/m3.
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