Solvay (societe Anonyme)

Solvay Sa

Solvay Polyolefins Europe-belgium (societe Anonyme)

Solvay Polyolefins Europe-belgium

Herve Collette

Sabine Pamart

Paul Fiasse

Jean-Louis Costa

Serge Bettonville

Catalytic system which can be used for the polymerisation of .alpha.-olefins comprising:

Catalytic system which can be used for the stereospecific polymerisation

Cocatalytic composition resulting from bringing an organoaluminium halide (A) into contact with an electron-donating organic compound (ED) selected from esters, amides and ketones, the organoaluminium halide (A) possessing an atomic ratio halogen (X)/aluminium (Al) of greater than 1 and less than 1.3, the halide (A) and the compound (ED) being employed in a mole ratio halide (A)/compound (ED) of greater than 20. Catalytic systems which are usable for the polymerization of alpha-olefins, comprising such a cocatalytic composition and a solid based on titanium trichloride complexed with an electron-donating compound.

Process for the polymerisation of alpha-olefins using a cocatalytic

Catalytic composition which may be used for the polymerization of alpha-olefins, comprising:

Catalytic system which may be used for the polymerization of

Cocatalytic composition resulting from bringing an organoaluminium halide (A) into contact with an electron-donating organic compound (ED) selected from esters, amides and ketones, the organoaluminium halide (A) possessing an atomic ratio halogen (X)/aluminium (Al) of greater than 1 and less than 1.3, the halide (A) and the compound (ED) being employed in a mole ratio halide (A)/compound (ED) of greater than 20. Catalytic systems which are usable for the polymerisation of alpha-olefins, comprising such a cocatalytic composition--and a solid based on titanium trichloride complexed with an electron-donating compound.

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Namur, Belgium

Herve Collette