Ethylene polymerization process in a liquid reaction medium

Details Ethylene polymerization process in a liquid reaction medium Ethylene polymerization process in a liquid reaction medium

C - Chemistry, Metallurgy

08

F

C08F 10/02 (2006.01) C08F 2/06 (2006.01) C08F 2/14 (2006.01) C08F 4/642 (2006.01) C08F 10/00 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01)

Patent

CA 2304491

Described is a metallocene polymerization process for producing ethylene polymers. The process exhibits very high productivity and is particularly useful for the production of ethylene homopolymers or high density polyethylene (HDPE). The process is conducted in a liquid reaction medium between about 25 ~C and 250 ~C and comprises feeding continuously or semi- continuously into the liquid reaction medium a catalyst solution comprising an unsupported zirconium or hafnium biscyclopentadienyl metallocene having one or more isobutyl groups on each cyclopentadienyl ring thereof.

L'invention se rapporte à un procédé de polymérisation par métallocènes destiné à la production de polymères d'éthylène. Ce procédé permet d'obtenir un rendement très élevé et il convient particulièrement à la production d'homopolymères d'éthylène ou de polyéthylène haute densité (HDPE). Il est mis en oeuvre dans un milieu réactionnel liquide à une température comprise entre 25 ·C et 250 ·C, et il consiste à introduire dans ledit milieu de réaction liquide, de manière continue ou semi-continue, une solution à effet de catalyseur comportant un métallocène de biscyclopentadiényle d'hafnium ou de zirconium supporté, possédant un ou plusieurs groupes isobutyle sur chaque noyau cyclopentadiényle.

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