illustrates the viscoelastic response of the PSA containing 50% tackifier dispersions. The Tg of the PSA blends increases dramatically with softening point, and modulus of the blend decreases with increase in tackifier dispersion addition. The higher the softening point of tackifier resins, the higher the Tg of the blend. Interestingly, the entire PSA blend containing 50% tackifier dispersion seems to be in the PSA region as explained by Dahlquist and others.