Photoreactive UV-crosslinkable solvent-free acrylic pressure-sensitive adhesives containing copolymerizable photoinitiators based on benzophenones

摘要

Acrylic pressure sensitive adhesives (PSAs) were first introduced about 50 years ago and have successfully applied in many fields. Approximately 40% of PSAs are acrylic, of which at most 10% are photoreactive solvent-free acrylic systems. UV curable PSAs have a number of attractive benefits. The ratio of peel adhesion to shear strength can be varied to some degree by controlling the UV energy applied (the films become more cohesive with increased radiant energy, while adhesion and tack decrease).