Bimodal polyolefin production process and films therefrom

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 4/02 (2006.01) C08F 4/44 (2006.01) C08F 4/60 (2006.01) C08F 4/642 (2006.01) C08F 10/00 (2006.01) C08F 110/02 (2006.01) C08F 210/02 (2006.01) C08F 210/16 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01)

Patent

CA 2497676

A process of producing a bimodal polyolefm composition is described, which includes in one embodiment contacting monomers with a supported bimetallic catalyst composition for a time sufficient to form a bimodal polyolefm composition that includes a high molecular weight polyolefin component and a low molecular weight polyolefin component; wherein the supported bimetallic catalyst includes a first catalyst component that is preferably nonmetallocene, and a second catalyst component that includes a metallocene catalyst compound having at least one fluoride or fluorine containing leaving group, wherein the bimetallic catalyst is supported by an enhanced silica, dehydrated at a temperature of 800 ~C or more in one embodiment.

L'invention concerne un procédé de production d'une composition de polyoléfines bimodales. Dans un mode de réalisation, ledit procédé consiste à mettre en contact des monomères avec une composition de catalyse bimétallique supportée pendant suffisamment de temps pour former une composition de polyoléfines bimodales qui contient un composé de polyoléfine à poids moléculaire élevé et un composé de polyoléfine à poids moléculaire bas. Le catalyseur bimétallique supporté renferme un premier composé de catalyse qui, de préférence, n'est pas un métallocène, et un second composé de catalyse qui contient un composé de catalyse du métallocène présentant au moins un groupe partant qui contient du fluorure ou du fluor. Ledit catalyseur bimétallique est alors supporté par un silice amélioré, déshydraté à une température d'au moins 800 ·C, dans un mode de réalisation.

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