Preparation of propylene homopolymers or copolymers
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United States of America Patent
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Apr 10, 1984
Grant Date -
N/A
app pub date -
May 26, 1982
filing date -
Jun 11, 1981
priority date (Note) -
Expired
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Abstract
The disclosure is directed to an improvement in the gas phase polymerization of propylene using a Ziegler-Natta catalyst in the presence of hydrogen wherein the gaseous propylene is withdrawn from the reactor, cooled and condensed and returned as a liquid to the reactor in order to regulate the polymerization temperature. The amount of the gaseous phase in the condenser-cooler-accumulator system is kept constant by regulating the amount of gaseous phase returned to the reactor.
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