Starch coated paperboard

EP4771219A1Pending Publication Date: 2026-07-08BILLERUD AB

Patent Information

Authority / Receiving Office: EP · EP
Patent Type: Applications
Current Assignee / Owner: BILLERUD AB
Filing Date: 2024-09-02
Publication Date: 2026-07-08

AI Technical Summary

Technical Problem

Existing pigment-coated paperboards face challenges in reducing grammage while maintaining bending stiffness and printability, especially in liquid packaging applications, due to the limitations of synthetic binders which are non-degradable and environmentally unfriendly.

Method used

The use of a coated paperboard with at least two coating layers comprising a mixture of a starch-based binder and a synthetic binder, where the starch-based binder constitutes 70-95 wt.% of the total binder, significantly increases the bending stiffness and maintains good printability while reducing environmental impact.

Benefits of technology

This solution allows for a reduction in the grammage of the paperboard substrate, leading to cost savings while maintaining package rigidity and printability, and significantly improves the environmental profile by using bio-based and compostable binders.

✦ Generated by Eureka AI based on patent content.

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Figure EP2024074454_06032025_PF_FP_ABST

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Abstract

There is provided a coated paperboard comprising a paperboard substrate and at least two coating layers, such as at least one pre-coating and at least one top coating, provided on a printing side of the paperboard, wherein: - the at least two coating layers comprise binders and pigment; - the binders comprise at least one synthetic binder and at least one starch-based binder; and - the starch-based binder is present in an amount of 70-95 wt.% based on the total dry amount of binder in the at least two coating layers.

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