Packaging material with lightweight water vapor barrier layer

A packaging material with a polyhydroxyalkanoate and biological wax mixture in the barrier layer addresses the challenge of low water vapor permeability in biodegradable coatings, achieving efficient and eco-friendly water vapor barrier performance.

WO2026149947A1PCT designated stage Publication Date: 2026-07-16DELSCI GMBH
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
DELSCI GMBH
Filing Date
2026-01-07
Publication Date
2026-07-16

AI Technical Summary

Technical Problem

Existing packaging materials face challenges in achieving low water vapor permeability with biodegradable coatings, leading to increased waste and processing issues, as higher coating amounts do not arbitrarily reduce permeability and cause processing problems.

Method used

A packaging material comprising a porous substrate with a barrier layer made of a mixture of polyhydroxyalkanoate and biological wax, where the wax fills the pores of the polyhydroxyalkanoate film during heat treatment, achieving low water vapor permeability with minimal coating material.

Benefits of technology

The solution effectively reduces water vapor permeability while minimizing coating material usage, resulting in reduced waste and improved processing efficiency, with the coating being biodegradable.

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Patent Text Reader

Abstract

The invention relates to a packaging material which comprises a porous substrate and a barrier layer applied to the porous substrate, wherein the barrier layer has a mass per unit area of at least 1 g / m² and at most 10 g / m², wherein at least 80% of the mass of the barrier layer is formed by a mixture of a polyhydroxyalkanoate and a biological wax, wherein the ratio of the masses of the polyhydroxyalkanoate and the biological wax is at least 3.0 and at most 25.0, and wherein the biological wax has an enthalpy of fusion of at least 80 J / g and at most 170 J / g and the water vapor transmission rate of the packaging material measured according to ISO 15106-2:2003 at 23°C and 85% relative humidity in at least one direction through the packaging material is at least 10 g / (m²·d) and at most 150 g / (m²·d).
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