Nano Clay-Modified PVOH: A Recyclable Barrier Solution for High-Humidity Packaging Applications, Advanced Coating Symposium (TAPPICon26)

Hydrophobically modified polyvinyl alcohol (PVOH) is an established oxygen barrier for paper-based packaging, offering excellent compatibility with water-based heat-seal layers and maintaining barrier integrity during sealing. Compared to standard PVOH, the hydrophobically modified grade can improve water vapor barrier performance by at least 20 times when combined with a styrene-acrylic top layer. However, humidity-dependent performance still limits broader application. This study investigates the incorporation of various high-aspect-ratio inorganic materials into PVOH coatings to further improve water vapor resistance without compromising recyclability. Barrier performance was evaluated before and after bending and benchmarked against conventional solutions: starch-based coatings, which require thick films and impose high COD/BOD loads, and urethane systems, which are water-insoluble and increase reject-side waste. Results demonstrate that nano clay-modified PVOH significantly improves humidity resistance while preserving film integrity and recyclability, providing a sustainable alternative to urethane and starch coatings for fiber-based packaging.

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