PRODUCTION OF POLYOLEFIN PRODUCTS Russian patent published in 2021 - IPC C08F4/6592 C07F17/00 

FIELD: polymers.

SUBSTANCE: present invention relates to a method for olefin polymerisation resulting in a polyolefin polymer with a multimodal distribution of composition, and to a polyolefin polymer. The method includes bringing ethylene and a comonomer into contact with a catalytic system, wherein the catalytic system comprises a first catalytic compound and a second catalytic compound with a common substrate, forming a catalyst system on the common substrate. The first catalytic compound comprises the formula: (C₅H_aR¹_b)(C₅H_cR²_d)HfX₂. The second catalytic compound comprises an alkylated metallocene compound with a mixture of meso-enantiomers and rac-enantiomers:

The second catalyst has a ratio of comonomer/ethylene less than approximately 0.5 greater than the comonomer/ethylene ratio of the first catalyst.

EFFECT: development of controlled technologies for production of polyethylene copolymers exhibiting a broad orthogonal distribution of the composition.

9 cl, 4 dwg, 12 tbl, 19 ex