Process for the preparation of polyolefin

Details Process for the preparation of polyolefin Process for the preparation of polyolefin

1995-06-05

1997-02-04

Wu, David W.

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

Synthetic resins

Removing and recycling removed material from an ongoing...

526 69, 526 70, 526153, 526160, 526943, 502152, C08F 206

Patent

active

055998852

ABSTRACT:
A process for the preparation of polyolefin which comprises polymerizing or copolymerizing olefin in the presence of a catalyst for olefin polymerization comprising (A) a metallocene compound of a transition metal selected from the Group IVB of the periodic table, and (B) an organoaluminum oxy-compound; wherein the organoaluminum oxy-compound (B) is added to the polymerization system in the form of a slurry in an aliphatic hydrocarbon or alicyclic hydrocarbon, and the polymerization is carried out in the presence of the aliphatic hydrocarbon diluent or an alicyclic hydrocarbon diluent having a boiling point below 100.degree. C. In an embodiment of the invention a polymer solution containing the resulting polyolefin obtained from the polymerization process is fed to a separation zone kept at a temperature of not lower than the upper cloud point of the polymer solution to separate the polymer solution into a lower phase portion containing the polyolefin in a high concentration and an upper phase portion, so as to recover the polyolefin from the lower phase portion in the separation zone and to recycle at least a part of the upper phase portion to the polymerization zone.

REFERENCES:
patent: 4433121 (1984-02-01), Kabu et al.
patent: 4564647 (1986-01-01), Hayashi et al.
patent: 4752597 (1988-06-01), Turner
patent: 4923833 (1990-05-01), Kioka et al.
patent: 4952540 (1990-08-01), Kioka et al.
patent: 5122491 (1992-06-01), Kioka et al.
patent: 5171799 (1992-12-01), Kioka et al.

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