CATALYST COMPOSITIONS CONTAINING FINE SILICON DIOXIDE PARTICLES AS CARRIER MATERIAL AND METHODS OF USE IN POLYMERISATION REACTIONS Russian patent published in 2010 - IPC C08F210/16 C08F4/02 C08F4/64 

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of carrying out polymerisation using enhanced catalyst compositions. The invention describes a method for synthesis of polyolefins, involving contact of ethylene in a reactor with at least one comonomer selected from a group consisting of C₃-C₈ alpha-olefin in the presence of a catalyst system on a carrier, wherein the catalyst system on a carrier contains at least one titanium compound, at least one magnesium compound, at least one compound which is an electron donor, at least one activating compound and at least one carrier material from silicon dioxide, wherein said at least one carrier material from silicon dioxide has average particle size between 20 and 35 micrometres, and average pore diametre ≥220 Å; in which at least one carrier material from silicon dioxide contains not more than 10% particles having size less than 12 micrometres and not more than 8% particles having size greater than 50 micrometres. Described also is a catalyst system on a carrier, containing at least one titanium compound, at least one magnesium compound, at least one compound which is an electron donor, at least one activating compound and at least one carrier material from silicon dioxide, wherein said at least one carrier material from silicon dioxide has average particle size between 20 and 35 micrometres, and average pore diametre ≥220 Å; where the said at least one carrier material from silicon dioxide has not more than 10% particles having size less than 12 micrometres and not more than 8% particles having size greater than 50 micrometres.

EFFECT: catalyst system which enables to obtain polyolefins with higher catalytic efficiency and improved operational characteristics, production of polymers having high bulk density.

18 cl, 6 dwg, 14 tbl, 32 ex