Process for making propylene homo or copolymers
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United States of America Patent
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May 13, 2003
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N/A
app pub date -
Apr 27, 2000
filing date -
Oct 10, 1995
priority date (Note) -
Expired
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Abstract
A process for homo or copolymerizing propylene, wherein propylene is polymerized in the presence of a catalyst at an elevated temperature in a reaction medium in which a major part of the reaction medium is propylene and the polymerization is carried in at least one CSTR or loop reactor, where the polymerization is carried out at a temperature and a pressure which are above the corresponding critical temperature and the pressure of the reaction medium and were the residence time is at least 15 minutes. The process can also have a subcritical loop polymerization before the supercritical stage polymerization or gas phase polymerization after the supercritical stage polymerization.
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