Multistage process for producing ethylene polymer compositions

Details Multistage process for producing ethylene polymer compositions Multistage process for producing ethylene polymer compositions

C - Chemistry, Metallurgy

08

F

C08F 10/02 (2006.01) C08F 2/00 (2006.01) C08F 4/02 (2006.01) C08F 4/76 (2006.01) C08F 210/16 (2006.01)

Patent

CA 2570370

The present invention relates to a process of producing an ethylene polymer composition in multiple stages, of which the first stage is preferably a slurry polymerization stage, in the presence of a catalyst system, comprising: a) a solid catalyst precursor, comprising a transition metal selected from titanium and vanadium; magnesium; a halide, optionally an electron donor; and a solid particulate material comprising an inorganic oxide, and wherein the median particle diameter, D50,of the solid catalyst precursor, based upon the total volume of solid catalyst precursor, is from 1 to 13 micrometers; and b) an organoaluminium compound.

La présente invention concerne un procédé de production d'une composition de polymère d'éthylène en plusieurs étapes, la première étape dudit procédé étant, de préférence, une étape de polymérisation en suspension, en présence d'un système catalytique, comprenant a) un précurseur catalytique solide, constitué d'un métal de transition sélectionné parmi le titane et le vanadium, de magnésium, d'un halogénure, éventuellement d'un donneur d'électrons et d'une matière particulaire solide comprenant un oxyde inorganique, le diamètre moyen de particules, D50,du précurseur catalytique solide, sur la base du volume total de précurseur catalytique solide, étant compris entre 1 et 13 microns, et b) un composé organoaluminium.

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