Bimodal polyethylene composition

By preparing bimodal polyethylene compositions with specific compositions and catalyst treatment, the problems of insufficient flowability and environmental stress cracking resistance of existing polyethylene resins in molded products have been solved, realizing the application of polyethylene resins with high flowability and environmental stress cracking resistance.

CN116917404BActive Publication Date: 2026-03-03NOVA CHEM (INT) SA
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Patent Information

Application Number
CN202280016747.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2021-02-24
Filing Date
2022-01-21
Publication Date
2026-03-03
Estimated Expiration
2042-01-21

AI Technical Summary

Technical Problem

Existing polyethylene resins are difficult to use in molded products simultaneously to possess high flow rate, good stiffness and toughness, and environmental resistance, especially insufficient resistance to environmental stress cracking.

Method used

A bimodal polyethylene composition comprising two ethylene copolymers prepared by a specific catalyst has been developed, exhibiting specific density, molecular weight distribution, and long-chain branching factor. Combined with an additive package, it improves flowability and resistance to environmental stress cracking.

Benefits of technology

It achieves high fluidity, relatively high density and rigidity, and has excellent resistance to environmental stress cracking and impact, making it suitable for manufacturing products such as molded, rotational molded, caps or closures.

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Abstract

The bimodal polyethylene composition has a density of 0.940 to 0.949 g / cm 3 greater than 5 g / 10 min, and an environmental stress crack resistance, ESCR, greater than 1000 hours as determined by ASTM D1693 in 100% IGEPAL CO-630 under Condition B. The bimodal polyethylene composition comprising the first ethylene copolymer and the second ethylene copolymer is relatively easy to process and can be used to make molded articles.
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Citation Information

Patent Citations

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    US10023706B2

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    US10442921B2

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