This paper demonstrates the improved performance seen by using the new zinc-containing oligomers for both UV curable PSAs and Hot-melt PSAs. For the first system, the UV curable liquid PSA - base tackifying blend, the best improvement was seen using a 6% addition of the Polyester zinc oligomer #2. This hybrid oligomer improved the 180° peel adhesion and the tack, but made no improvements on the SAFT. To improve the SAFT and the 180° peel adhesion either the polyester zinc oligomer #3 or urethane zinc oligomer #1 needs to be used at a 6% level, but a reduction in tack will be seen. As for the second system, the UV curable liquid PSA - formulated PSA blend, we obtained improvements for all the hybrid oligomers tested. For the 180° peel adhesion, the best results were seen with the thicker Polyester zinc oligomer #5 addition, but the urethane zinc oligomer #1 gave excellent thin and thick adhesive application testing. The urethane also had the best tack of the systems tested and had the best overall SAFT results, again for both thin and thick application.
展开▼
