Polymerization process to prepare a polyolefin from...

C - Chemistry – Metallurgy – 08 – F

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C08F 10/14 (2006.01) C08F 4/626 (2006.01) C08F 110/14 (2006.01)

Patent

CA 2074582

A process comprising contacting under polymerization conditions: at least one trialkylaluminum cocatalyst; at least one alpha-olefin which has a methyl branch at the 3-position and which has at least five carbon atoms; with a catalyst prepared by the process comprising comminuting, at least one aluminum halide, at least one electron donor, at least one metal compound wherein the metal is selected from the group consisting of chromium, hafnium, molybdenum, niobium, tantalum, titanium, tungsten, vanadium, zirconium, and mixtures thereof, a salt compound wherein at least one component of said salt compound is selected from the group consisting of barium, beryllium, calcium, magnesium, strontium, zinc, and mixtures thereof, to produce a comminuted solid then subjecting said comminuted solid to a double activation-extraction step; to produce a polymer at a productivity level of at least 700 grams of polymer per gram of catalyst utilized.

Méthode consistant à mettre en contact dans des conditions de polymérisations : au moins un cocatalyseur à base de trialkylaluminum; au moins une alpha-oléfine avec une branche méthyle en position 3, comptant au moins cinq atomes de carbone; un catalyseur préparé par une méthode consistant à broyer au moins un halogénure d'aluminium, au moins un donneur d'électrons, au moins un composé métallique, où le métal est choisi parmi le chrome, l'hafnium, le molybdène, le niobium, le tantale, le titane, le tungstène, le vanadium, le zirconium et leurs mélanges, un sel dont au moins l'un des constituants est choisi parmi le baryum, le béryllium, le calcium, le magnésium, le strontium, le zinc et leurs mélanges; on obtient ainsi un solide broyé, lequel est soumis à une double étape d'activation-extraction, de façon à produire un polymère à un rythme d'au moins 700 grammes de polymère par gramme de catalyseur utilisé.

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