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Known to be able to enhance numerous key performances like adhesion, toughness, flexibility, abrasion resistance, pigment wetting or cure speed, mono- and multifunctional (meth)acrylates bearing urethane groups are widely used in varnishes, inks and adhesives. While mostly used in radiation-curable , these raw materials also find use in other systems; urethane dimethacrylates as crosslinker in anaerobic adhesives, urethane monoacrylates as co-monomer in polyacrylics for laminating adhesives, urethane di(meth)acrylates as flexibilizer in protective coatings, to name but a few. The use of expensive and hazardous isocyanates in current industrial processes makes the urethane (meth)acrylates often the most expensive resin in the formulation, which often precludes to use an optimum amount. Isocyanates should also require being stored, handled and processed at large scale in secured industrial equipments with special safety procedures, which may have a strong impact on transformation costs. This is especially true when the volatile n-butyl monoisocyanate is reacted with hydroxyethyl acrylate (HEA) to make n-butyl acryloyloxy ethyl carbamate, a commercially-available urethane monoacrylate acknowledged as being able to bring unique properties to radiation-curable pressure sensitive or 4 adhesives.
