Bimetallic polymerization catalysts comprising multidentate...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 4/60 (2006.01) C08F 4/70 (2006.01) C08F 10/00 (2006.01) C08F 110/02 (2006.01)

Patent

CA 2425509

A bimetallic olefin polymerization catalyst is described. The catalyst comprises an organometallic compound, and optionally, an activator. The organometallic compound comprises a Group 3-5 transition or lanthanide metal, M1, a Group 6-10 transition metal, M2, and a multidentate ligand characterized by a cyclopentadienyl group that is covalently linked to two Group 15 atoms, wherein the cyclopentadienyl group is .pi.-bonded to M1 and the two Group 15 atoms are coordinated to M2. The bimetallic catalyst is useful for producing copolymers from ethylene without using a co-monomer by oligomerizing ethylene and simultaneously polymerizing ethylene and the co-formed oligomer.

L'invention concerne un catalyseur bimétallique de polymérisation d'oléfine. Celui-ci comprend un composé organométallique et, éventuellement, un activateur. Le composé organométallique comprend un métal de transition du groupe Groupe 3-5 ou un métal lanthanide, M1, un métal de transition du Groupe 6-10, M2, et un ligand multidentelé caractérisé par un groupe cyclopentadiényle lié par covalence à deux atomes du Groupe 15, le groupe cyclopentadiényle étant lié par liaison pi à M1 et les deux atomes du Groupe 15 étant coordonnés à M2. Le catalyseur bimétallique est utilisé pour produire des copolymères à partir d'éthylène sans utiliser de co-monomère par oligomérisation de l'éthylène et polymérisation simultanée de l'éthylène et de l'oligomère co-formé.

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