Continuous process for the manufacture of ethylene homopolymers

Details Continuous process for the manufacture of ethylene homopolymers Continuous process for the manufacture of ethylene homopolymers

1983-12-23

1987-03-17

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Removing and recycling removed material from an ongoing...

526 83, 526 84, C08F 602

Patent

active

046508414

ABSTRACT:
The process, which comprises a first stage for (co)polymerizing ethylene at 180.degree.-320.degree. C. and 300-2,500 bars in the presence of a Ziegler type catalytic system, a second stage for separation, a third stage for recycling unreacted monomers, and a fourth, recompression stage, is characterized by introducing into the stream of recycled monomer(s) during the third stage, at least one compound selected from the amides of the saturated or unsaturated organic acids containing from 12 to 22 carbon atoms, polyalkylene polyols containing from 4 to 500 carbon atoms, and compounds containing at least two epoxide functions, with a molecular weight greater than approximately 200. Preferably from 0.005 to 0.1 mole of the selected compound is introduced per ton of recycled monomer.
This process makes it possible to avoid the formation of high molecular weight polymers in the recycle circuits.

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patent: 4419473 (1983-12-01), Mahaffey, Jr.
patent: 4551509 (1985-11-01), Takayuki

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