Sustainable lignin-based adhesives for plastic/metal laminates

The “Lignin-based Adhesives for Laminates” project aims to replace fossil-based polyurethane (PU) adhesives in industrial laminates with a novel, biobased, isocyanate-free lignin-based alternative. This addresses health risks from diisocyanates in PUs and reduces environmental impact. Lignin, a by-product from Nordic kraft pulp mills, is currently underutilised and mostly incinerated. Its natural properties enable a flexible chemistry platform to tailor adhesive performance and overcome typical biobased adhesive issues, such as brittleness.

The six-month feasibility study, led by RISE (Research Institutes of Sweden) and Skultuna Flexible AB, will develop lignin-based adhesive formulations and conduct lab and pilot-scale trials on relevant laminate foils. These trials will evaluate key performance metrics, including bond strength, curing behaviour, and durability, against conventional PU benchmarks. The project delivers a clear go/no-go decision for further development. Success would eliminate isocyanate exposure, reduce fossil-based carbon emissions, and valorise lignin waste, supporting Sweden’s bioeconomy goals and more sustainable high‑volume lamination. RISE leads R&D and testing, while Skultuna provides industrial, material, and adhesive expertise and conducts pilot trials to ensure technical and commercial viability.