Gas barrier laminate and packaging using the same

The gas barrier laminate with a high water-soluble polymer and flake-like filler, along with metal alkoxides and silica fillers, addresses the issue of performance deterioration under deformation, maintaining airtightness and appearance while being environmentally friendly.

JP2026113597APending Publication Date: 2026-07-07TOPPAN HOLDINGS INC
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
TOPPAN HOLDINGS INC
Filing Date
2026-04-02
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Conventional gas barrier laminates face issues with gas barrier performance deterioration due to mechanical deformations like stretching and bending, especially when using water-soluble heat-seal varnishes, leading to cracks and reduced seal strength, which compromises airtightness and aesthetic appearance.

Method used

A gas barrier laminate comprising a gas barrier coating layer with 70% or more water-soluble polymer and 5-30% flake-like filler, along with a water-soluble heat-seal varnish, enhances coating suitability and maintains gas barrier performance under mechanical deformation by incorporating metal alkoxides and silica fillers with silanol groups.

Benefits of technology

The laminate maintains excellent gas barrier properties and seal strength even after mechanical deformation, ensuring airtightness and aesthetic integrity without environmental impact from solvent use.

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Abstract

To provide a gas barrier laminate and a packaging material using the same, which exhibits excellent coating suitability for water-soluble heat seal varnish and whose gas barrier performance does not deteriorate after mechanical deformation such as stretching or bending. [Solution] A gas barrier laminate in which at least a gas barrier coating layer and a seal layer are laminated on a substrate in this order, wherein the gas barrier coating layer contains 70-95% by mass of a water-soluble polymer and 5-30% by mass of a flake-like filler, the aspect ratio of the flake-like filler is 50 or more, the seal layer consists of a water-soluble heat seal varnish, the water-soluble heat seal varnish is an aqueous polyolefin resin having at least one selected from carboxyl groups, salts of carboxyl groups, carboxylic acid anhydride groups and carboxylic acid esters, and the gas barrier coating layer contains metal alkoxides and their hydrolysates, the content of metal alkoxides and their hydrolysates and flake-like fillers in the gas barrier coating layer is 5-30% by mass.
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