Photoreactive Acrylic Pressure-sensitive Adhesives Research Articles

Influence of unsaturated photoinitiators on acrylic pressure-sensitive adhesive properties

Solvent-based acrylic pressure-sensitive adhesives (PSAs) containing unsaturated copolymerizable photoinitiators were synthesized. This study describes novel photoreactive acrylic PSAs in which performance in the form of molecular weight, tack, peel adhesion and shear strength are dependent on photoinitiator kind and concentration, UV-dose, and UV-crosslinking time.

UV-initiated crosslinking of photoreactive acrylic pressure-sensitive adhesives using excimer-laser

UV-initiated crosslinking technology is well established in the market and allows the production of a wide range of ultraviolet (UV)-crosslinkable pressure-sensitive adhesives (PSA) with interesting features. The balance between such properties as adhesive and cohesive strengths within the crosslinked self-adhesive coatings is critical for their performance. The UV crosslinking of acrylic PSA, especially for following properties: tack, peel adhesion, and shear strength of self-adhesive polymer layers, has been investigated using UV excimer-laser and UV lamp as UV sources. It was observed that after UV crosslinking of acrylic PSA using excimer-laser in comparison with typical UV lamp, high-quality PSA products with excellent properties, such as tack, peel adhesion, shear strength, and shrinkage were received.

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

The design and development of new, tailor-made, novel photoreactive acrylic pressure-sensitive adhesives, which can cope with both the technical and ecological demands, is therefore a continuing challenge for industrial research and development. Progress in the coating technology and the development of improved photoreactive acrylic adhesive will open the door for new applications and an extended market penetration of UV-crosslinkable acrylic adhesive raw materials containing unsaturated copolymerizable photoinitiators incorporated into the polymer backbone. They are characterized by good tack, good adhesion, excellent cohesion and very high shrinkage resistance. In this paper it is shown the application of H-abstractor such as 4-acryloyloxy benzophenone to obtain of the UV-crosslinked acrylic PSA.The presented novel UV-crosslinkable acrylic hotmelt PSA combines the economic advantages of the hotmelt coating technology with the high performance characteristics of the acrylic chemistry, including an excellent aging resistance, optical transparency and heat resistance.