Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in two or more physically distinct zones
Patent
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.
Horie Tatsuo
Kubo Kunimichi
Kuroda Nobuyuki
Matsuura Kazuo
Miyoshi Mituji
Levin Stanford M.
Nippon Oil Company Limited
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