Multilayer film structure for bundle shrink film comprising a multimodal ethylene terpolymer and recycled ldpe

CN118748964BActive Publication Date: 2026-07-10BOREALIS AG +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BOREALIS AG
Filing Date
2022-11-10
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

When using recycled materials, existing bundled shrink membranes cannot simultaneously meet the high requirements for mechanical and shrinkage properties, and the need for membrane thickness reduction is not met.

Method used

A layered membrane structure comprising a core layer and an outer layer is adopted, wherein the core layer is composed of a multimodal ethylene terpolymer and recycled LDPE, and the outer layer is composed of a multimodal ethylene terpolymer or LDPE. The layered membrane structure is produced by co-extrusion.

Benefits of technology

This approach achieves the goal of maintaining or improving the membrane's rigidity, toughness, and shrinkage performance while increasing the amount of recycled materials used, thereby reducing material usage and lowering the CO2 footprint.

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Abstract

A layered membrane structure comprising a core layer C and outer layers E1 and E2, wherein the core layer C comprises a multimodal ethylene terpolymer (I) and recycled LDPE, the multimodal ethylene terpolymer (I) having at least one C4 to C2 layer. 12 α-olefins, having an MFR5 concentration of 0.1 g / 10 min to 5 g / 10 min as determined according to ISO 1133, and having a concentration of 0.934 g / cm³. 3 Up to 0.940 g / cm 3 The recycled LDPE has a density of 0.1 g / 10 min to 10 g / 10 min as determined according to ISO 1133 and an MFR of 910 kg / m³. 3 Up to 940kg / m 3 The density is within the range of; and wherein the outer layer E1 and / or the outer layer E2 comprises a multimodal ethylene terpolymer (II) having an MFR2 of 0.5 g / 10 min to 10 g / 10 min as determined according to ISO 1133 and having a density of 0.920 g / cm³. 3 Up to 0.935 g / cm 3 The density.
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