Three ethylene vinyl acetate (EVA) copolymers with different vinyl acetate (VA) contents (28-40 wt%) were mixed with rosin ester and polyterpene resin tacki ers in a 1 : 1 (weight/ weight) ratio. The rheological and thermal properties of the tacki ers were determined and the use of rheological measurements as a precise way to measure the softening point of the tacki ers is proposed. The glass transition temperature of the tacki ers was obtained from the second heating run, after the thermal history of the tacki ers was removed. The addition of the rosin ester to EVA produced a compatible mixture, whereas for the terpene resin a less compatible mixture was obtained. The increase in the VA amount decreased the crystallinity of EVA and both the storage and the loss moduli also decreased, but the peel strength and the immediate adhesion were increased. The immediate adhesion of EVA/ tacki er blends was affected by both the compatibilityand the rheologicalproperties of the blends. In fact, a relationship between the mechanical storage modulus (E 0 ) -obtained from DMTA experiments -of the adhesives and the immediate adhesion to thin rubber substrates was obtained. The adhesives containing the T tacki er showed higher moduli than those containing the G tacki er, and therefore higher peel strength values were obtained. An increase in the VA content increased the exibility of the adhesives and thus a decrease in peel strength was obtained.
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