COMBINATION OF CATALYSTS CONTAINING SUPPORT MATERIALS, CHARACTERISED BY IMPROVED PARTICLE SIZE DISTRIBUTION Russian patent published in 2011 - IPC C08F10/00 C08F4/646 C08F210/16 

FIELD: chemistry.

SUBSTANCE: method involves bringing hydrogen and ethylene monomers into contact with a composition deposited on a catalyst support based on several transition metals to obtain a polyolefin composition; where the composition deposited on the catalyst support based on several transition metals contains: (a) at least two catalyst components selected from a group consisting of: non-metallocene catalyst component which is a Ziegler-Natta catalyst, and a metallocene catalyst component of formula Cp^ACp^BMX_p and Cp^A(A)Cp^BMX_p, where each of Cp^A and Cp^B is identical or different and is unsubstituted or substituted with a cyclopentadienyl ring, each of which is bonded with M; M is an atom of a group 4 element; X is selected from a group consisting of C₁-C₆ alkyls, C₆ aryls, C₇-C₁₂ alkylaryls, fluorinated C₁-C₆ alkyls, fluorinated C₆ aryls, fluorinated C₇-C₁₂ alkylaryls, chlorine and fluorine; n equals 1 or 2; (A) denotes a divalent bridging group; and at least one X denotes fluorine or fluorinated hydrocarbonyl; (b) support material which is characterised by D₅₀ value less than approximately 30 micrometres, and particle size distribution characterised by ratio D₉₀/D₁₀ less than approximately 5; and (c) an activator. The invention also discloses a composition deposited on the catalyst support, a polymer and a film.

EFFECT: method increases catalyst efficiency and lowers concentration of gel in the polymer product.

20 cl, 1 ex, 1 tbl, 2 dwg