Ethylene-propylene copolymer compositions

Details Ethylene-propylene copolymer compositions Ethylene-propylene copolymer compositions

C - Chemistry, Metallurgy

08

F

C08F 210/06 (2006.01) C08F 210/02 (2006.01) C08F 210/14 (2006.01) C08F 210/16 (2006.01) C08F 297/08 (2006.01)

Patent

CA 2058530

ABSTRACT Polypropylene impact copolymers and ethylene propylene rubbery copolymers are produced by employing a high-activity, stereoregular polymerization catalyst comprising a titanium halide-containing procatalyst, an organoaluminum compound cocatalyst and a selectivity control agent. During at least the production of the copolymer portion of such polymers, the selectivity control agent is a moderately hindered aromatic nitrogen heterocyclic compound. The impact copolymers thereby produced have improved impact strength and low temperature properties and the ethylene- propylene rubbery copolymers thereby produced have good properties and improved processability.

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