Pressure sensitive adhesives are designed to create a bond under applied pressure and provide a balance between shear holding ability, tack, and peel adhesion. Crosslinking of PSAs can lead to improved shear strength.<sup> </sup>A variety of chemical and UV crosslinkers have been employed in acrylic systems to obtain balanced PSA properties. One frequently employed approach has been to use diacrylates, which crosslink acrylic PSAs with free radical chemistry. However, a free-radical mechanism is also typically used for the polymerization of the PSA, which means that crosslinking and polymerization occur simultaneously.<br/>In order to trigger physical properties on demand orthogonal chemistries are frequently utilized. This approach spans application areas from photolithography to biophysics to pressure sensitive adhesives. The breadth of chemistries developed for this type of triggered reaction or staged reaction is tremendous with many different strategies.<br/>Hot-melt PSAs are becoming more widely used due to their elimination of solvent and cost benefits. However, creating high performance PSAs from hot-melt coated adhesives requires a carefully designed, effective crosslinking strategy providing an easily processable adhesive with balanced properties. The crosslinking agent precursor should be stable and unreactive during hot-melt processing to avoid gelation and/or poor coating. The precursor should also effectively crosslink the adhesive once activated after the coating process is completed. This talk will address a variety of approaches to enable hot-melt pressure sensitive adhesives.

Enabling more sustainable pressure sensitive adhesives

ACS Spring 2022

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.