Todays pressure-sensitive adhesives deliver excellent performance - but there is still room for improvement. They already effectively adhere to various substrates, and are relatively easy to re-peel - but that re-peeling could still be made easier. PSAs have been widely applied in construction and manufacturing, in household, automotive and stationary goods, for example because they adhere to a substrate in a short time with little pressure. Yet there are applications that demand even better performance, or make previously ignored properties important.

Polymeric microspheres are now helping deliver enhanced performance in many of these areas. Larger than particles found in conventional emulsion adhesives, these spheres have a big impact on adhesive tack. They create a discontinuous adhesive surface that limits physical contact with a substrate, making removability easier. The microsphere adhesive holds labels firmly in place on most substrates yet is permanently repositionable.

Typically microsphere adhesives are formed directly from raw materials by a water-based free-radical suspension polymerisation using two acrylic monomers.¹ However, for specialized applications the microspheres are sometimes formed by dispersion polymerisation in an organic solvent, and then added to a separately-formed adhesive.²

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