Process for producing copolymers of propylene
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United States of America Patent
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Aug 2, 2016
Grant Date -
Nov 5, 2015
app pub date -
Dec 19, 2013
filing date -
Dec 28, 2012
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Abstract
The present invention is directed to a process of polymerizing propylene in at least three stages. In the first, and optionally in the second, polymerization stage propylene, ethylene and at least one alpha-olefin having from 4 to 10 carbon atoms are introduced into the polymerization reactors as fresh monomer feeds. In the third polymerization stage propylene and optionally ethylene is introduced as fresh monomer feed.
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