Process for the preparation of polyolefin

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

C - Chemistry, Metallurgy

08

F

C08F 10/00 (2006.01) C08F 4/622 (2006.01) C08F 6/00 (2006.01) C08F 36/20 (2006.01) C08L 21/00 (2006.01) C08L 23/16 (2006.01) C08F 4/659 (2006.01) C08F 210/06 (2006.01) C08F 210/16 (2006.01) C08F 210/18 (2006.01)

Patent

CA 2087916

A first process for the preparation of polyolefin according to the invention is a process comprising polymerizing or copolymerizing olefin in the presence of a catalyst for olefin polymerization comprising [A] a metallocene compound of a transition metal selected from 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 of said organoaluminum oxy-compound [B] in an aliphatic hydrocarbon or alicyclic hydrocarbon, and the polymerization is carried out in the presence of an aliphatic hydrocarbon diluent or an alicyclic hydrocarbon diluent. A second process for the preparation of polyolefin according to the invention is a process comprising: (i) polymerizing or copolymerizing olefin in a liquid phase in the presence of the above-mentioned catalyst; and (ii) feeding a polymer solution containing the resulting polyolefin from a polymerization zone 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.

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