FIELD: chemistry.
SUBSTANCE: described is a catalyst composition including one or more Ziegler-Natta procatalyst compositions containing one or more transition metal compounds and an internal electron donor, one or more aluminium containing cocatalysts, and a selectivity control agent (SCA), which contains a mixture of a carboxylic acid ester and a compound which does not contain silane, selected from the group consisting of a diether compound, a succinate compound, a piperidine compound and combinations thereof.
EFFECT: present catalyst composition does not contain silane, has high catalytic activity and high stereoselectivity, and is capable of ensuring self-attenuation of the polymerisation reaction.
10 cl, 3 tbl
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