High-temperature slurry polymerization of ethylene

Details High-temperature slurry polymerization of ethylene High-temperature slurry polymerization of ethylene

C - Chemistry, Metallurgy

08

F

C08F 2/14 (2006.01) C08F 10/00 (2006.01) C08F 110/02 (2006.01) C08F 210/16 (2006.01)

Patent

CA 2051948

This invention relates to a high-temperature slurry polymerization of ethylene where: the hexene is generated in situ; a chromium catalyst system 15 used; a trialkyl boron or a polyalkyl silane compound is used as a cocatalyst; the temperature of the reaction is above the foul curve temperature for a specific copolymer density; and where the polymerization takes place in a continuous loop reactor which has isobutane as a diluent. Additionally, hexene can be withdrawn, or added, to adjust the density.

Cette invention porte sur la polymérisation à température élevée de l'éthylène, où : l'hexène est produit in situ; on utilise un catalyseur au chrome de type système 15; un composé de trialkylbore ou un polyalkylsilane sert de cocatalyseur; la température de la réaction dépasse celle de la partie anormale de la courbe pour une densité particulière du copolymère; et où la polymérisation se fait dans un réacteur à boucle sans fin utilisant l'isobutane comme diluant. De plus, on peut régler la densité en enlevant ou en ajoutant de l'hexène.

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