OBTAINING POLYOLEFIN PRODUCTS Russian patent published in 2020 - IPC C08F4/6592 C07F17/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a catalyst composition for copolymerisation of ethylene and alpha-olefins. Catalytic composition contains a first catalyst compound and a second catalyst compound, which have a common substrate, forming a catalyst system on a common substrate, wherein the first catalyst compound contains the following formula: (C₅H_aR¹_b)(C₅H_cR²_d)HfX₂, where each R¹ independently represents H, a hydrocarbon group, a substituted hydrocarbon group or a heteroatomic group; each R² independently represents H, a hydrocarbon group, substituted hydrocarbon group or a hetero group; a and c ≥ 3; a + b = c + d = 5; at least one R¹ and at least one R² is a hydrocarbon group or a substituted hydrocarbon group; adjacent groups R¹ and R² may be linked to form a ring; and each X independently represents a leaving group selected from a mobile hydrocarbon group, a substituted hydrocarbon group or a heteroatomic group; and second catalyst compound contains a mixture of enantiomers:

where ratio of meso-enantiomer to rac-enantiomer is substantially normalized during alkylation to value from 1.0 to 1.2, where each R³ independently represents H, a hydrocarbon group, a substituted hydrocarbon group or a heteroatomic group; R⁴ is a hydrocarbon group, a substituted hydrocarbon group or a heteroatomic group; each R⁵ independently represents H, a hydrocarbon group, a substituted hydrocarbon group or a heteroatomic group; where R³, R⁴ and R⁵ can be identical or different; and each X is a methyl group.

EFFECT: invention enables to obtain a catalyst composition for copolymerisation of ethylene and alpha-olefins, which has a specific ratio of meso/rac enantiomers.

3 cl, 4 dwg, 12 tbl