Process for continuously producing propylene-ethylene block...

Details Process for continuously producing propylene-ethylene block... Process for continuously producing propylene-ethylene block...

C - Chemistry, Metallurgy

08

F

400/2058

C08F 297/08 (2006.01) C08F 10/06 (2006.01) C08F 210/06 (2006.01)

Patent

CA 1287933

ABSTRACT OF THE DISCLOSURE A process for continuously producing a propylene- ethylene block copolymer with a good productivity, through two polymerization stages using a stereoregular catalyst comprising a Ti-containing solid catalyst and an organoaluminum compound, is provided, which process is characterized in that at the first stage, propylene is mainly fed into two or more polymerization vessels connected in series, to produce 60 to 95% by weight of the total polymerization quantity, and at the second stage, a specified quantity of a glycol ether is added to the polymerization reaction mixture obtained above and ethylene is fed in a relatively large quantity into one or more polymerization vessels, to produce 5 to 40% by weight of the total polymerization quantity. A polymer so produced has improved low-temperature impact properties, without unacceptable loss of stiffness, processability, heat resistance, etc, characteristic of propylene ethylene block copolymers.

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