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UV curing systems are widely used in various applications, e.g., coatings, printing inks, adhesives, photoresist, and solder masks. UV curing systems are low VOC, highly productive, and energy saving. Multi-functional acrylate monomers and oligomers are mainly used and the cured materials show excel!ent physical and/or thermal properties. However, in some applications of curing materials, the property is a kind of drawback. Since crosslinked materials are insoluble in solvents and infusible networks, scratching or chemical treatments with strong acid or base must be applied to remove these networks from substrates. Crosslinked materials are generally difficult to thoroughly remove without damaging underlying materials. Recently, some thermosets which are thermally or chemically degradable under a given condition have been reported 1-6]. One problem for those re-workable thermosets is incomplete solubilization after thermal degradation. In this paper, we report the novel re-workable 'UV curing systems. We have synthesized and characterized difunctional epoxy monomers having sulfonate ester units and acrylate monomers which have acetal units in a molecule. Sulfonate ester and acetal units are thermally degradable. Photoand thermal curing of those monomers and thermal degradation of the cured materials are reported.
