Laminated film

By layering inorganic films and protective layers onto a polyester resin substrate film, the shortcomings of gas barrier films in terms of resistance to damp heat, alcohol resistance, and reusability are solved, achieving high-efficiency barrier anisotropy and easy recycling, and reducing environmental impact.

CN116887980BActive Publication Date: 2026-06-05TOYOBO CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TOYOBO CO LTD
Filing Date
2022-02-03
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing gas barrier films have shortcomings in terms of resistance to damp heat, alcohol resistance, barrier anisotropy, and reusability. Furthermore, they are difficult to maintain performance and separability during recycling, leading to an increase in environmental impact.

Method used

An inorganic film layer and a protective layer are sequentially laminated on a polyester resin substrate film. The protective layer contains a urethane resin containing isophthalic acid to avoid the use of a cover layer. Barrier properties and adhesion are ensured by the water vapor transmittance and infrared absorption peak intensity ratio under specific conditions. It can be easily peeled off after hot water treatment.

Benefits of technology

A laminated film with excellent resistance to damp heat, alcohol, and film recyclability has been achieved. It has barrier anisotropy and reusability, ensuring the stability and recyclability of gas barrier performance and reducing environmental impact.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

[Problem] To provide: a laminated film with excellent reusability, which is a laminated film formed by sequentially having an inorganic film layer and a protective layer on a substrate film layer obtained using polyester resin, exhibiting excellent resistance to damp heat, alcohol resistance, film recyclability, and thus excellent barrier anisotropy, and allowing the laminated film and sealant layer to be easily peeled off from the laminated laminate. [Solution] A laminated film characterized in that an inorganic film layer is provided on at least one side of a substrate film, and a protective layer is provided on the inorganic film layer, the protective layer comprising a urethane resin containing isophthalic acid, wherein the laminated film satisfies the following conditions (a) to (d): (a) No cover layer is laminated between the substrate film and the inorganic film layer. (b) The ratio of the water vapor transmission rate A of the protective layer when water vapor passes through from the substrate film side to the water vapor transmission rate B when water vapor passes through from the protective layer side at 40°C × 90% RH is B / A ≤ 2.0. (c) The protective layer has a total reflectance infrared absorption spectrum of 1530±10cm. ‑1 The region exhibits a peak intensity (P1) with extremely high absorption, and the protective layer surface after immersing the aforementioned laminated film in 95°C hot water for 10 minutes, then applying and peeling off adhesive tape to the protective layer surface, has a peak intensity of 1530±10 cm. ‑1 The ratio of the peak intensity (P2) with maximum absorption in the region (P2 / P1) is greater than 0.7. (d) The aforementioned protective layer at 1530±10 cm⁻¹ in the total reflectance infrared absorption spectrum. ‑1 The region exhibits a peak intensity (P1) with extremely high absorption, and the protective layer surface after immersing the aforementioned laminated film in 99% ethanol for 1 hour, followed by applying adhesive tape to the protective layer surface and then peeling it off, has a peak intensity of 1530±10 cm. ‑1 The ratio (P2 / P1) of the peak intensity (P2) with maximum absorption in the region is above 0.7.
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