FIELD: polymerization of olefins. SUBSTANCE: desired component is prepared by interaction of halide compound of tetravalent titanium or haloid alcoholate and electron donor compound with porous polymer carrier. Dihalide of magnesium or compound of magnesium which has no Mg-C bond is supported on said polymer carrier. Content of Mg before reaction with said titanium compound and after it is 6-12 mass %. EFFECT: improved quality. 4 cl, 3 tbl
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