A temperaturesweepatconstantfrequencywasalsoper-
formed onthedryfilmPSAsusingdynamicmechanicalanalysis
(DMA). Fig. 7 shows theviscoelasticresponseforPSAcontaining
25% tackifierdispersions.
Viscoelastic behaviorssuchasstoragemodulusandtan d
temperature canbeseenin Fig. 7. Anarrowsingletan d reveals
that allthreealiphatichydrocarbontackifierdispersionsarevery
compatible upto50%additionlevelswithnaturalrubberlatex
(Figs. 7 and 8). Tg of thePSAblendsystematicallyincreaseswith
softening points(Fig. 7 and Table 4), andstoragemodulusofthe