Continuous process for the preparation of polyolefins having wid

Details Continuous process for the preparation of polyolefins having wid Continuous process for the preparation of polyolefins having wid

1980-04-07

1983-11-08

Levin, Stanford M.

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

Synthetic resins

Polymerizing in two or more physically distinct zones

525 53, 525240, 526 66, 526348, 5263486, 526352, C08F 214, C08F 466

Patent

active

044143699

ABSTRACT:
Polyolefins having a wide distribution of molecular weights are prepared in a plural stage process, by initially polymerizing the olefins in the presence of a solvent, hydrogen and a highly active Ziegler type catalyst under pressure, and beneath a gas phase containing an inert gas, to form in the first stage a polymer having a relatively high molecular weight. The polymerization reaction mixture from the first stage is continuously flowed to a second stage reactor. The second stage reactor is maintained at a relatively lower pressure, such that the flow is driven by the higher pressure in the first stage. The second stage is agitated and the polymerization reaction mixture is maintained beneath an atmosphere containing olefins and hydrogen gas. Polymers of relatively low molecular weight are formed in the second stage. The product continuously removed from the second stage contains a polymer having a wide distribution of molecular weight.

REFERENCES:
patent: 3592880 (1971-07-01), Diedrich et al.
patent: 3718632 (1973-02-01), Gardner et al.
patent: 4014859 (1977-03-01), Cooper et al.

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