ETHYLENE POLYMER AND METHOD FOR PRODUCTION THEREOF Russian patent published in 2025 - IPC C08F2/06 C08F210/02 

FIELD: chemistry.

SUBSTANCE: group of inventions relates to an ethylene polymer and a method for production thereof. Method of producing a high-density ethylene polymer, characterized by a true density of the ethylene polymer of 0.930–0.980 g/cm³, consists in carrying out suspension polymerisation, wherein raw materials containing ethylene, gaseous hydrogen and a comonomer are reacted in a container using an alkane solvent having a boiling point of 5–55 °C, or a mixed alkane solvent having a saturated vapor pressure of 20–150 kPa at 20 °C, as a polymerisation solvent in the presence of a catalyst system for producing polyethylene, said comonomer is selected from C₃-C₁₀-alpha-olefins. Catalyst system for producing polyethylene contains one basic catalyst for producing polyethylene, selected from a non-metallocene catalyst on a support, a metallocene catalyst on a support, a Ziegler-Natta catalyst. Polymerisation solvent is selected from n-pentane, isopentane, neopentane and cyclopentane, or a mixed alkane solvent having a saturated vapor pressure of 20 °C 20–150 kPa, obtained by mixing two or more alkanes selected from n-pentane, isopentane, neopentane and cyclopentane. In the case of using a non-metallocene catalyst as the main catalyst, the molar ratio of hydrogen gas to comonomer is 8–30:1, the molar ratio of hydrogen gas to ethylene is 0.01–20:1, when using a metallocene catalyst as the main catalyst, the molar ratio of hydrogen gas to comonomer is 0.1–5:1, the molar ratio of hydrogen gas to ethylene is 0.01–0.15:1, when using a Ziegler-Natta catalyst as the main catalyst, the molar ratio of hydrogen gas to comonomer is 8–30:1, the molar ratio of hydrogen gas to ethylene is 0.01–20:1.

EFFECT: providing a method of producing an ethylene polymer having an average particle size of 50–3000 mcm, a bulk density of 0.28–0.55 g/cm³, true density 0.930–0.980 g/cm³, melt index at load 2.16 kg at 190 °C 0.01–2500 g/10 min, crystallinity 30–90%, melting point 105–147 °C, molar fraction of introduction of comonomer 0.01 is 5 mol.%, weight-average molecular weight 2 × 10⁴–40 × 10⁴ g/mol and molecular weight distribution 1.8–10 and process index in film blowing test 4–6.

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