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Today both solvent-borne and reactive solventless polyurethane adhesives are dominating the adhesive market for flexible food packaging. These adhesive technologies are more and more confronted with two market demands: quick converting after lamination and providing a maximum of toxicological safety. There should be no storage times of several days between lamination and delivery to the food packer, as being common for current laminating adhesives. These storage times are necessary today for most solventless and many solvent-based adhesives in order to build up molecular weight and bonding strength for subsequent cut and sealing processes, and in order to reduce low molecular weight ingredients with a toxicological risk potential for the food being packed.
New water-borne adhesives make it possible to convert laminates immediately after laminate production and enable food packaging within a very short time period. In addition a maximum of toxicological safety is guaranteed. The key for these benefits is the molecular weight distribution of these new aqueous dispersions.
The adhesive performance of the new polyurethane and acrylic based aqueous dispersions has been improved significantly and reach into high performance applications now.
Schumacher, Karl-Heinz Dr.
"New Water-Based Adhesives For Flexible Food Packaging Chemical Design, Performance and Toxicological Safety,"
Journal of Applied Packaging Research: Vol. 8
, Article 7.
Available at: http://scholarworks.rit.edu/japr/vol8/iss1/7