Preparation of propylene homopolymers or copolymers

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Effecting a change in a polymerization process in response...

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526 67, 526 68, 526901, 526905, C08F 234, C08F 1006

Patent

active

044422717

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polymerization of propylene using a Ziegler-Natta catalyst in the presence of hydrogen wherein the gaseous propylene is withdrawn from the reactor, cooled and condensed and returned as a liquid to the reactor in order to regulate the polymerization temperature.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.

REFERENCES:
patent: 4012573 (1977-03-01), Trieschmann et al.

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