Energy curable adhesives

As pointed out above, radiation or energy curable adhesives can be essentially hot melts or liquids at the room temperature. For this technology, a liquid curable PSA formulation is comprised of four essential components ... 

Energy curable adhesives for use in flexible packaging based on ultraviolet or electron beam irradiation are in their infancy. The potential use of these types of adhesive is promising due to the fast cure rate (essentially full cure on irradiation and hence low risk of migratory components) and the potentially... 

TABLE X - PRESSURE SENSITIVE ENERGY-CURABLE ADHESIVES... 

Over the years there have been several studies examining electron-curable adhesives [9-12]. Off-the-shelf acrylate adhesives were the primary focus of the studies. These adhesives, that have potential use for the repair of advanced composites using high-energy electron accelerators, offer several advantages over conventional repair systems, including [6] ... 

Pigments generally inhibit uv curing to some degree since the pigments absorb and/or scatter uv radiation. This interferes with the ability of the photoinitiator to absorb the light energy required to initiate the polymerization reactions. Thus, the majority of commercial radiation curable adhesives are clear or contain silica. 

Recently, Dowbenko et al (Ref. 4) of PPG Industries described two approaches to the development of energy-curable pressure sensitive adhesives. One Involved the incorporation of low molecular weight acrylic polymers into hot melt formulations the second employed radiation polymerization of monomer-polymer syrups. 

Uses Defoamer in inks and coalings, solventless, solv., waterborne, and energy-curable systems, food-contact inks and coatings defoamer in food-confact paper coatings, paper/paperboard food pkg. adhesives Regulatory FDA21CFR 175.105,175.300,176.170,176.180,176.200, 176.210... 

This overview of radiant energy curable technologies for adhesives includes discussions of the form of radiant energies, where they are used, their market size, chemical nature, and properties. The article centers on ultraviolet, infrared, and electron beam technologies. 

UV-curable adhesives have established themselves as a significant part of the overall market for specialty adhesives because they offer a number of advantages over traditional adhesives, as illustrated in Fig. 13. One can expect this part to increase in the near future, as the ever more stringent regulations aiming to lower air pollution and energy consumption will progressively curtail the use of solvent-based adhesives. 

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