METHODS FOR OBTAINING POLYOLEFINS, POSSESSING MULTIMODAL MOLECULAR-WEIGHT DISTRIBUTION Russian patent published in 2016 - IPC C08F2/00 C08F10/00 C08F10/02 C08F4/6592 C08F255/00 C08L23/00 C08L23/06 

FIELD: chemistry.

SUBSTANCE: described is method for obtaining multimodal polyolefin composition. Method includes interaction of first olefin monomer with mixed catalytic system under polymerisation conditions with formation of polyolefin component, possessing weight average molecular weight Mw, equal from 5000 to 600000 g/mol. Mixed catalytic system includes polymerisation catalyst, containing transition metal of group 4 or 5, chromo-organic polymerisation catalyst, activator and substrate material. Combination first polyolefin component/mixed catalytic system interacts with molecular switch, which contains oxygen and alkylaluminium, and combination first polyolefin component/mixed catalytic system interacts with second olefin monomer, which can coincide or not coincide with first olefin monomer, with obtaining multimodal polyolefin composition. Mixed catalytic system and method for thereof obtaining are also described.

EFFECT: regulation of content of possessing different molecular weights polyolefins, which possess multimodal molecular-weight distribution.

15 cl, 1 tbl, 2 dwg, 2 ex