Catalytic system for the (CO)polymerization of ethylene with alpha-olefins

A chromium-aluminum catalytic system on a wide-pore carrier addresses the limitations of existing methods by enhancing molecular weight distribution and melt flow index, enabling diverse HDPE production with improved process efficiency.

WO2026142462A1PCT designated stage Publication Date: 2026-07-02PUBLIC JOINT STOCK COMPANY SIBUR HOLDING
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
PUBLIC JOINT STOCK COMPANY SIBUR HOLDING
Filing Date
2025-11-05
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Existing methods for producing chromium-based catalysts for high-density polyethylene (HDPE) are costly, complex, and limited in producing a wide range of polyethylenes due to issues with solvent use, pore collapse, and inefficient activation processes, leading to restricted molecular weight distribution and melt flow index.

Method used

A chromium-based catalytic system supported on a wide-pore carrier with a specific molar ratio of aluminum to chromium, activated under non-reducing conditions, ensuring efficient diffusion and heat exchange, producing polymers with a wide molecular weight distribution and high melt flow index.

Benefits of technology

The system enables the production of HDPE with a wide molecular weight distribution and high melt flow index, allowing for a variety of polyethylene products with improved process stability and efficiency.

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Abstract

Proposed is a catalytic system for the (co)polymerization of ethylene with alpha-olefins which comprises chromium and aluminum and is applied to an inorganic support, characterized in that: the molar ratio of aluminum to chromium in the catalytic system ranges from 0.99 to 31.2; the inorganic support has an average pore diameter of at least 150 Å; and the average size of the particles of the inorganic support ranges from 50 to 100 µm. Also proposed is a method for producing the claimed catalytic system, a method for the (co)polymerization of ethylene with an alpha-olefin using said system, and an ethylene-alpha-olefin copolymer produced using said method.
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