PREPOLYMERIZED CATALYST COMPONENTS FOR OLEFIN POLYMERIZATION Russian patent published in 2020 - IPC C08F2/34 C08F110/06 C08F4/651 C08F4/649 

FIELD: chemistry.

SUBSTANCE: present invention relates to prepolymerized catalyst components for polymerising olefins, particularly propylene, having characteristic chemical properties and containing Mg, Ti, chlorine and an electron donor selected from 1,3-diethers. Said pre-polymerised catalyst component is characterized in that electron donor (ID) contains at least 80 mol. % of 1,3-diethers in terms of total molar amount of electron-donor compounds; prepolymerized catalyst has a porosity of less than 0.2 cm³/g according to the Hg method due to pores with a diameter up to 1 micron; said component of prepolymerised catalysts contains less than 45 % ethylene prepolymer with respect to the total weight of the pre-polymerised catalyst and said component of prepolymerized catalysts further contains an alkylaluminium compound. Catalytic system includes a reaction product between: (i) a pre-polymerised solid catalyst component as claimed in any of the preceding claims; (ii) an alkylaluminium compound and, optionally, (iii) an external electron-donor compound. Gas-phase method of olefin polymerisation is carried out in the presence of said catalytic system.

EFFECT: technical result is considerable reduction or elimination of formation of entangled fibres at the stage of dispersion.

15 cl, 1 tbl, 2 ex