METHOD OF PRODUCING CATALYST FOR POLYMERISATION OF ETHYLENE AND COPOLYMERISATION OF ETHYLENE WITH ALPHA-OLEFINS Russian patent published in 2015 - IPC C08F4/02 C08F4/16 C08F4/654 C08F4/656 C08F10/02 

FIELD: chemistry.

SUBSTANCE: described is a method for gas-phase polymerisation of ethylene and copolymerisation of ethylene with alpha-olefins in the presence of a supported catalyst with particle size ≥20 mcm, obtained by reacting a solution of an organomagnesium compound with a compound which enables to convert the organomagnesium compound into a solid magnesium-containing support, followed by treating the solid product with a titanium compound, where as the organomagnesium compound butylmagnesium chloride in an ether solution R₂O is used, where R is butyl or i-amyl, and the compound required to convert the organomagnesium compound into a solid magnesium-containing support is a composition which includes a reaction product of an alkylchlorosilane composition R'_kSiCl_4-k, where R' is an alkyl or phenyl, k=1, 2, and silicon tetraalkoxide Si(OEt)₄ in molar ratio SiCl/Si(OEt)=0.4-14, molar ratio Si/Mg=1-2 and temperature 10-40°C.

EFFECT: obtaining polyethylene with high output and the required particle size of 450-800 mcm, with a narrow particle size distribution.

2 cl, 1 tbl, 11 ex