| Résumé : |
Carton closure hot-melt packaging adhesives using ethylene vinyl acetate (EVA) polymer systems have been used for decades due to their availability, formulation latitude and performance attributes.1 Packaging adhesive formulations typically contain polymer, tackifier resin and wax.
Packaging adhesives using EVA can be formulated using a variety of tackifier systems, including rosin esters, hydrocarbon resins (C5, C9, C5/C9), terpene resins and hydrogenated hydrocarbon resins.2-7 However, for premium packaging adhesive applications where clarity, thermal stability and temperature resistance are critical, EVA-based packaging adhesives are often formulated with hydrogenated hydrocarbon tackifiers.
The hot-melt adhesive industry has recently trended toward high-quality packaging adhesives due to cost benefits and improved performance characteristics. This has prompted the development of aromatic pure monomer resins (PMRs) as synergetic tackifier additives for EVA-based premium packaging adhesives.
PMRs are produced from pure aromatic monomer streams, especially styrene and alkyl styrene derivatives. Compared to other aromatic crude C-9 resins, major advantages of PMRs include light color (water white), excellent thermal stability, temperature resistance (similar to hydrogenated hydrocarbon resins) and controlled molecular weight.8-14
In this study, the effect of different PMRs and their benefits in performance attributes when used in premium EVA hot-melt packaging adhesives are described. It was determined that packaging adhesives containing PMRs can effectively improve adhesive and cohesive performance characteristics while maintaining other performance attributes of the adhesive. PMR-containing adhesives also exhibit good thermal stability and temperature resistance. |
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Improving performance of hot-melt packaging adhesives in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 20, N° 10 (10/2013)
