A series of pressure-sensitive adhesives, based on vinyl acetate (VA) and butyl acrylate (BuA) and functionalized with small amounts of acrylic acid (AA), were synthesized by semicontinuous emulsion polymerization. This technique allowed preparing latex particles with high monodispersity and pre-defined particle size. The influence of the VA/BuA ratio on the tack, peel, and shear strength of the coatings was investigated. To explain the dependence of adhesive properties (shear, peel, and tack) on particle composition, a Monte Carlo simulation based on a simple model was used to understand the film formation process. The simulation showed that dense adlayers were formed from dispersions containing a relative high content of BuA. Experimental testing showed that films with a low VA/BuA ratio (30/70) exhibited moderate values of shear resistance due to well-structured layers formation, with improved tack and peel properties. A positive influence of functionalization on the adhesive properties was observed at low AA content (1% w.) in coatings enriched in BuA, as a result of surface particle saturation with charged groups.
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Soto et al. (2005) studied this question.
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