OPTIMIZING WATER AND WATER VAPOR BARRIER PROPERTIES OF WATERBASED BARRIER COATINGS, TAPPICon24

Functional coatings are applied to paper and paperboard substrates to provide resistance, or a barrier, against media such as oil and grease (OGR), water, water vapor (MVTR) and oxygen, for applications such as food packaging, food service and other non-food packaging. Typical functional barrier coatings can be created by applying a solid coating or extruded film, a solvent-based coating or a water-based coating to the paper substrate using various means of coating applicators. Today, there is increasing interest in developing recyclable and more sustainable approaches to producing these types of packages.

This paper focuses on water-based barrier coatings (WBBC) for water resistance and MVTR for medium barrier performance. The main goal was to improve the performance of existing barrier polymers using additives such as waxes. Barrier coated systems were evaluated in single layer lab coating studies.

This paper reviews examples of improving the performance of barrier polymers studied, including styrene butadiene and styrene acrylate, using wax additives. Regulatory challenges with paraffin waxes have resulted in the focus on bio-waxes. The results showed that small amounts of bio-wax can significantly improve barrier properties, especially for water resistance and MVTR. The choice of the best combination of binder and wax is essential. The influence of the bio-wax additive on blocking tendency, coldset glue strength or heat seal strength is negligible.

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