Abstract
The viscosity, tack, and peel strength of an SBR/SMR L-based pressure-sensitive adhesive was studied. Coumarone–indene resin and toluene were used as the tackifier and solvent, respectively, throughout the experiment. The blend ratio of SBR/SMR L was varied from 0 to 100% whereas the resin content was increased from 40 to 120 parts per hundred parts of rubber in the adhesive formulation. The viscosity was determined by a HAAKE rotary viscometer. Loop tack and peel strength of paper/polyethylene terephthalate film were measured using a Lloyd adhesion tester operating at 30 cm/min. Results show that the viscosity of the adhesive decreases with % SBR but increases with resin loading. Loop tack of adhesive indicates a maximum value at 20% SBR for all resin loadings. The peel strength, however, exhibits maximum value at 40% SBR for the three modes of peel tests, an observation which is attributed to the optimum wettability of adhesive on the substrate where formation of mechanical interlocking and anchorage of the adhesive in pores and irregularities in the substrate occurs.
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