METHOD OF OLEFIN POLYMERISATION Russian patent published in 2010 - IPC C08F210/06 C08F2/34 C08F2/00 C08F4/6592 C08F4/642 

FIELD: chemistry.

SUBSTANCE: invention claims multistage method involving the following stages: stage a) propylene polymerisation, optionally with one or more monomers selected out of ethylene or alpha-olefins of formula CH₂=CHT¹, where T¹ is C₂-C₁₀-alkyl radical, in the presence of catalytic system applied onto silicon dioxide and containing: i) one or more metallocene compounds of formula (I); ii) alumoxane or compound capable of alkylmetallocene cation formation; and optionally iii) organoaluminium compound; stage b) contact with one or more alpha-olefins of CH₂=CHT formula in polymerisation conditions in propylene or ethylene gas phase, where T is hydrogen or C₁-C₁₀-alkyl radical, and optionally with non-conjugated diene in the presence of polymer obtained at stage a) and optionally in the presence of additional organoaluminium compound, provided that homopolymer formation does not occur; where polymer amount obtained at stage a) lies within 5 to 90 wt % of polymer weight obtained through the whole method, and polymer amount obtained at stage b) lies within 10 to 95 wt % of polymer weight obtained through the whole method.

EFFECT: enhanced flexibility in composition and property adjustment for end product.

14 cl, 4 ex, 2 tbl