Ethylene-alpha-olefin copolymer, thermoplastic resin composition, film, and laminate

By optimizing the melting characteristics and molecular structure of ethylene-α-olefin copolymers, the problems of shrinkage and stretching fluctuations in ethylene polymers during the molding process were solved, enabling the production of films and laminates with high mechanical strength and transparency.

CN117120489BActive Publication Date: 2026-02-06MITSUI CHEMICALS INC +1
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Patent Information

Application Number
CN202280025166.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2022-03-04
Filing Date
2022-03-30
Publication Date
2026-02-06
Estimated Expiration
2042-03-30

AI Technical Summary

Technical Problem

Existing ethylene-based polymers suffer from problems such as large shrinkage, tensile fluctuations, insufficient mechanical strength, and poor transparency during molding, making it difficult to meet the production requirements of high-quality films.

Method used

By preparing ethylene-α-olefin copolymers with specific melting properties and molecular structures, and combining them with thermoplastic resin compositions in specific proportions, the molecular weight distribution and long-branched structure are optimized to avoid pull fluctuations and improve mechanical strength and transparency.

Benefits of technology

It achieves films and laminates with excellent formability, exceptional mechanical strength, and transparency, suitable for T-die molding and blow molding, avoiding shrinkage and stretching fluctuations, and improving the film's adhesive strength and heat-sealing properties.

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Abstract

The present invention provides an ethylene-α-olefin copolymer which is excellent in moldability and particularly excellent in mechanical strength compared with the prior art. The copolymer of ethylene and an α-olefin having 4 to 10 carbon atoms satisfies the following conditions (1) to (7). (1) The density is 890 to 925 kg / m 3 ; (2) The MFR (190°C, 2.16 kg load) is 3.0 to 15.0 g / 10 minutes; (3) The MT (melt tension) / η * (shear viscosity) is 1.40 x 10 ‑4 to 2.90 x 10 ‑4 g / P; (4) 0.01 x 10 ‑13 x Mw 3.4 ≤ η0 (zero shear viscosity) ≤ 4.5 x 10 ‑13 x Mw 3.4 ; (5) -2.0 ≤ Mz / Mw - Mw / Mn ≤ 15; (6) The number of ethylene groups and the like is 0.1 to 1.0 per 1000C; and (7) The DSC melting curve has multiple peaks.
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