Physical Property Modifications in UV Curable PSA's

摘要

Our goal of this series of experiments was to determine appropriate additives to vary physical characteristics of the UV curable PSA in a positive manner for what you're trying to achieve. Just as a general comparison, the first two base blends use the standard formulation, bolih containing a urethane acrylate in the backbone. The third formulation is a low cost look at an UV curable PSA with its modifications. If we first could focus just on base blend #1 with its modifications. At room temperature all the blends have a low viscosity, except the modification with additional hydrocarbon resin. The best peel adhesion is seen with the modification with additional monomers, SR256 and SR504, which is also the lowest viscosity formulation. The higher dose of the "D" blend gives the very best peel adhesion for base #1. The results from Figure 7 also show us that the best tack was achieved from the monomer dilution, with a dose cure of 400 mJ/cm~2. And then in Figure 10. we can see that again, the best SAFT was achieved with the monomer dilution with a dosage of 150 mJ/cm~2, although, the 400 mJ/cm~2 also give very good results. Moving onto base blend #2 and its modifications, room temperature viscosities are lower than base blend #1. In this series, overall the peel adhesion values are slightly higher than the base blend #1 for most all the modifications. Again, the modification with additional monomers added show the best peel adhesion results. And even the tack, shown in Figure 8. are better, especially in the monomer modified PSA. Our best SAFT results for the base blend #2 are seen with the addition of CN301. We only seen an improvement in the modified base blend #1 using the CN301 when cured with a higher dose, 700 mJ/cm2. But with the base blend #2, overall the CN301 yielded better results.