Process for the manufacture of polyolefins

Details Process for the manufacture of polyolefins Process for the manufacture of polyolefins

C - Chemistry, Metallurgy

08

F

402/622, 402/643

C08F 4/64 (2006.01) C08F 10/02 (2006.01)

Patent

CA 1087799

ABSTRACT OF THE DISCLOSURE An improvement in a process for the preparation of an ethylene homo- polymer or a copolymer of ethylene with an .alpha.-olefin containing 3 to 15 carbon atoms by contacting the monomer or mixture of monomers in solution, suspension or in gas phase at 20° to 250° at a pressure of 1 to 50 bar with a mixed catalyst comprising a chlorine containing titanium (III) compound and an organoaluminum compound in the presence of hydrogen, the improvement residing in employing as the organoaluminum compound a trialkylaluminum compound in an amount of 0.1 to 20 mol per mol titanium (III) compound and including in the polymerization mixture oxygen at a concentration of 0.001 to 0.1 volume percent based upon the amount of ethylene. By carrying out the polymerization by including oxygen in the polymerization reaction mixture and employing tri- alkylaluminum compound as the organoaluminum compound the mean molecular weight of the polymer can be regulated while obtaining a desired molecular weight distribution.

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