IMPROVED CATALYST SYSTEM FOR PRODUCING POLYETHYLENE COPOLYMERS IN HIGH-TEMPERATURE SOLUTION POLYMERISATION METHOD Russian patent published in 2019 - IPC C08F4/6592 C08F210/16 C07F17/00 C08F2/04 

FIELD: chemistry.

SUBSTANCE: invention relates to a catalyst system for producing ethylene copolymers in a high-temperature solution, a metallocene complex of formula (I), use of catalyst system and metallocene complex in high-temperature solution polymerisation of olefins at temperature of more than 100 °C and a method of producing an ethylene copolymer. Catalyst system comprises (i) a metallocene complex of formula (I), where M is Hf or Zr, X is halogen or methyl radical, L is a bridging group of formula -SiR⁸₂-, where each R⁸ independently represents methyl, ethyl, propyl, isopropyl, tert-butyl or isobutyl, n equals 0, 1 or 2, R¹ and R^1' are identical or can be different and can be a linear or branched C₁-C₆-alkyl group, R² and R^2' are identical or different and represent CH₂-R⁹ group, where R⁹ is H or a linear or branched C₁-C₆-alkyl group, R⁵ and R^5' are different and can be H or a linear or branched C₁-C₆-alkyl group OR group, where R is C₁-C₆-alkyl group, R⁶ and R^6' are identical or different and can represent H or a group C(R¹⁰)₃, where R¹⁰ are identical or different, and R¹⁰ can be H or a linear or branched C₁-C₆-alkyl group, wherein either one pair of R⁵ and R⁶ or R^5' and R^6' form together unsubstituted 5–6-member ring fused with a benzene ring of the indenyl moiety, and remaining residues R⁵ and R⁶ or R^5' and R^6' in case R⁵ or R^5' are an OR group, where R is C₁-C₄-alkyl group, and in case R⁶ or R^6' represent group C(R¹⁰)₃, where R¹⁰ are identical, and R¹⁰ can represent C₁-C₂-alkyl group, or R⁵ and R⁶ and R^5' and R^6', taken together, form unsubstituted 4–7-member ring condensed with a benzene ring of the indenyl moiety, provided that if R⁵ and R⁶, as well as R^5' and R^6', taken together, form unsubstituted 5–member ring condensed with a benzene ring of the indenyl moiety, then R² and R^2' are not C₁-alkyl group; and R⁷ and R^7' can be identical or different and can represent H or a linear or branched C₁-C₆-alkyl group, (ii) aluminoxane cocatalyst and (iii) boron-containing cocatalyst. Formula (I):

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EFFECT: catalyst systems have excellent activity, efficiency and stability.

16 cl, 5 tbl, 5 ex