Low- or zero-VGC, sprayable acrylic urethane clearcoats have been developed for weatherable applications. One-component, UV-curable coatings were prepared using novel acrylated urethane-acrylic resins. Two-component coating systems were developed using a partially acrylated urethane acrylic polyol and conventional 2K urethane components, diluted in acrylate monomers and acetone. These coatings have excellent appearance,, physical properties, and weatherability, suggesting that UV-curing clearcoat technology could be applied to automotive OEM and refinish applications, as well as wood and plastic parts. The 2K/UV formulations are particularly interesting, in that they offer the instantaneous cure and productivity of UV-curable coatings while maintaining the physical properties, weatherability, and low-cost characteristics of conventional 2K urethane systems.
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