Polymerization processes

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 10/02 (2006.01) C08F 4/24 (2006.01) C08F 10/00 (2006.01) C08F 110/02 (2006.01)

Patent

CA 2239193

A polymerization process is provided comprising contacting under polymerization conditions a catalyst, a taming agent, ethylene and optionally a comonomer, wherein the catalyst comprises chromium oxide, titanium oxide and an inorganic refractory oxide, wherein the taming agent is selected from the group consisting of water, alcohols, aldehydes, ketones, esters, and organic acids and mixtures thereof. The process is especially suited for polymerizing ethylene resins suitable for blow molding use.

L'invention concerne un procédé de polymérisation consistant à mettre en contact, dans des conditions appropriées, un catalyseur, un agent modérateur, de l'éthylène et éventuellement un co-monomère. Le catalyseur comprend de l'oxyde de chrome, de l'oxyde de titane et un oxyde minéral réfractaire. L'agent modérateur est choisi dans le groupe constitué par l'eau, les alcools, les aldéhydes, les cétones, les esters et les acides organiques, ainsi que leurs mélanges. Le procédé est particulièrement bien adapté à la polymérisation de résines éthyléniques destinées à être utilisées en extrusion-soufflage.

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