FIELD: chemistry.
SUBSTANCE: catalyst contains tetracyclopentadienyl zirconium (C5H5)4Zr, aluminoxane, a polyalkyl derivative of a nontransition metal MtRn, where Mt is a group IIA-IVA nontransition metal, and R = CH3, C2H5, C3H7, C4H9, iso-C4H9, C8H17; and/or titanium tetraalkoxide. The catalyst can have a support selected from a group comprising silica gel, ash from burning rice husks, kaolin or diatomite. The catalyst is biphase and contains a solid and liquid phase. The solid phase is metallocene and aluminoxane pre-deposited on the support, and the liquid phase is a solution of titanium tetraalkoxide in an aliphatic or aromatic solvent. Medium- or low-density polyethylenes are obtained in the presence of said catalyst. Medium and low-density polyethylene with given molecular weight, molecular-weight distribution and branching is obtained by varying the molar ratio titanium alkoxide/metallocene and MtRn/metallocene in the catalyst.
EFFECT: improved method.
4 cl, 3 tbl, 24 ex
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