A new Liofol laminating adhesive from Henkel – FastOne LA 1640-21 – is intended to replace isocyanate-containing adhesives in the production of flexible food packages.
Michael Gierlings, technical commercial service manager Liofol, comments: “To bond the individual materials to one another, the current practice is to use mainly polyurethane adhesives based on isocyanates. When fully cured, these are safe for human health. However, if the adhesive has not fully cured when the package is filled, the remaining isocyanate monomers can migrate into the food and react with the water there to form aromatic amines.
“Our goal was to develop an adhesive that would enable just-in-time manufacturing of flexible packages without the slightest risk to consumers in terms of the adhesive.”
A one-component PUR laminating adhesive, Liofol FastOne LA 1640-21 is said to cure fully in just one day. This development leap was made possible by a new non-isocyanate technology said to ‘neatly sidestep the whole isocyanate migration problem’. According to Henkel, none of the substitute substances used in the new adhesive are subject to any specific migration limits according to food legislation.
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