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UV and thermally cured materials have become increasingly important in coatings, adhesives, electronics, and advanced manufacturing due to their rapid curing speeds and high-performance properties. Among these materials, cationically curable systems offer several advantages over conventional free-radical curing technologies, including the ability to cure in the presence of oxygen, reduced polymerization shrinkage through ring-opening mechanisms, and continued post-curing through dark reactions after irradiation. Oxetane-based monomers have emerged as particularly attractive components in these systems because of their low viscosity, favorable safety profile, and ability to enhance processing and performance characteristics. To expand the range of available cationically curable materials, Toagosei developed the monofunctional oxetanes OXT-211 (POX) and OXT-213 (CHOX), which exhibit exceptional toughness and flexibility in cured products. This paper examines the physical properties, curing behavior, mechanical performance, adhesion characteristics, thermal stability, and safety of these novel oxetane monomers, demonstrating their potential as high-performance materials for coatings, adhesives, and other applications requiring improved toughness and durability.