Transition metal catalytic systems and methods for preparing...

Details Transition metal catalytic systems and methods for preparing... Transition metal catalytic systems and methods for preparing...

C - Chemistry, Metallurgy

07

F

C07F 17/00 (2006.01) C08F 4/6592 (2006.01) C08F 110/02 (2006.01) C08F 210/16 (2006.01)

Patent

CA 2723960

Provided are transition metal catalytic systems for preparing ethylene homopolymers or copolymers of ethylene with .alpha.-olefins. More specifically, provided are Group 4 transition metal catalysts, which is characterized in that the catalyst comprises around the Group 4 transition metal a cyclopentadiene derivative, and at least one aryloxide ligand(s) having a fluorenyl group or a derivative thereof (which is ready to be substituted at 9-position) that functions as an electron donor and serves to stabilize the catalytic system by surrounding an oxygen atom that links the ligand to the transition metal at ortho-position, and there is no cross-linkage between the ligands; catalytic systems comprising such transition metal catalyst and aluminoxane co- catalyst or boron compound cocatalyst; and processes for preparing ethylene homopolymers or copolymers of ethylene with .alpha.-olefins by using the same.

L'invention concerne des systèmes catalytiques à métal de transition permettant de préparer des homopolymères d'éthylène ou des copolymères d'éthylène et d' a-oléfines. Plus spécifiquement, elle concerne des catalyseurs à métal de transition du groupe 4, caractérisés en ce qu'ils comprennent un dérivé de cyclopentadiène autour du métal de transition du groupe 4, et au moins un ligand aryloxyde comportant un groupe fluorényle ou un dérivé de celui-ci (pouvant être substitué en position 9) qui sert de donneur d'électron et à stabiliser le système catalytique en entourant un atome d'oxygène qui lie le ligand au métal de transition en position ortho, aucune liaison croisée n'étant présente entre les ligands; des systèmes catalytiques comprenant un tel catalyseur à métal de transition et un cocatalyseur d'aluminoxane ou un cocatalyseur de composé boré; et des procédés de préparation d'homopolymères d'éthylène ou de copolymères d'éthylène et d'a-oléfines utilisant ces systèmes catalytiques.

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