Process for preparing ethylene polymer and ethylene polymer

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 4/642 (2006.01) C08F 4/64 (2006.01) C08F 4/643 (2006.01) C08F 4/655 (2006.01) C08F 10/00 (2006.01) C08F 10/02 (2006.01) C08F 110/02 (2006.01) C08F 210/02 (2006.01) C08F 210/14 (2006.01) C08F 210/16 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01)

Patent

CA 2183650

The process for preparing an ethylene polymer according to the invention comprises homopolymerizing ethylene or copolymerizing ethylene and an .alpha.-olefin of 3 to 20 carbon atoms at a temperature of not lower than 80 °C in the presence of a catalyst comprising (A) a specific Group IVB transition metal compound, (B) (B-1) an organoaluminum oxy-compound and/or (B-2) a compound which reacts with the Group IVB transition metal compound (A) to form an ion pair, and optionally, (C) an organoaluminum compound. According to the process of the invention, an ethylene (co)polymer having a high molecular weight can be obtained even at a high polymerization temperature. Further, since the polymerization can be carried out at a temperature higher than those in the conventional processes, a small-sized heat removal device can be used to decrease the equipment cost.

L'invention concerne un procédé de production de polymère d'éthylène, qui consiste à effectuer une homopolymérisation où une copolymérisation de l'éthylène avec une alpha -oléfine C3-C20, à 80 DEG C ou plus, en présence d'un catalyseur comprenant les éléments suivants: (A) un composé métallique de transition spécifique du groupe IVB; (B) (B-1) un composé organoaluminiumoxy et/ou (B-2) un composé qui réagit avec le composé métallique de transition (A) en vue de former une paire d'ions, et, si nécessaire, (C) un composé organoaluminium. Le procédé décrit permet d'obtenir un (co)polymère d'éthylène ayant une masse molaire améliorée même lorsque la température de polymérisation est élevée. Selon ce procédé, la polymérisation peut être effectuée à une température supérieure à la température habituelle et, partant, il est possible miniaturiser le système de refroidissement en vue de réduire le coût de l'installation.

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