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Selecting Acrylic Emulsion PSA Dispersion Particle Size Distribution

SpecialChem / Andy Extance – Jan 9, 2012

Until recently the lack of control in emulsion polymerisations has meant that most acrylic PSA formulation knowledge came from solution polymerisation. But recent improvements have meant better polymer size distribution (PSD) control, which influences latex viscosity and solid content. High solid content is desirable for economical production and rapid drying, but achieving this while retaining a low viscosity is difficult, though modifying PSD can deliver this. Meanwhile, it's been thought that PSDs with the smallest particle size possible, which provide minimum viscosity, delivered the best adhesion. Recent results challenge that wisdom. When formulating pressure sensitive adhesives, it's easy to be overawed by the depth of the science underlying a product's character. Optimum PSA performance depends on skilfully controlling the adhesive's properties through its molecular characteristics, with parameters like glass transition temperatures (Tg) and low-frequency dynamic storage moduli (G') being especially important.

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