Abstract: A urethane acrylate composite structure includes a first layer that is a show surface of the urethane acrylate composite structure and a support layer. The support layer includes a urethane acrylate composition that includes a urethane acrylate adduct. The urethane acrylate adduct is the reaction product of an isocyanate component and a stoichiometric excess of a functionalized acrylate component. The isocyanate component includes toluene diisocyanate and polymeric polyphenylmethane polyisocyanate. The functionalized acrylate component is reactive with the isocyanate component. The urethane acrylate composition exhibits improved viscosity due to the isocyanate component. The combination of the toluene diisocyanate and the polymeric polyphenylmethane polyisocyanate results in the improved viscosity of the urethane acrylate composition while maintaining excellent resin curing and finished composite structure properties.

Abstract: A urethane acrylate composition includes a urethane acrylate adduct. The urethane acrylate adduct is the reaction product of an isocyanate component and a stoichiometric excess of a functionalized acrylate component. The functionalized acrylate component is reactive with the isocyanate component. The urethane acrylate composition also includes an inhibitor and a first metal salt. The inhibitor has a functional group that is sterically hindered. The urethane acrylate composition exhibits excellent stability over time. The presence of the inhibitor in combination with the metal salt improves the storage stability of the urethane acrylate composition.

Abstract: A composite structure includes a first layer, a support layer, and a urethane acrylate layer disposed between the first layer and the support layer. The first layer is a show surface of the composite structure. The urethane acrylate layer includes a urethane acrylate composition that includes a urethane acrylate adduct. The urethane acrylate adduct is the reaction product of an isocyanate component and a stoichiometric excess of a functionalized acrylate component. The isocyanate component has at least two isocyanate groups. The functionalized acrylate component has at least one isocyanate-reactive functional group that is reactive with at least one of the isocyanate groups for forming the urethane acrylate adduct. The resulting urethane acrylate composition is sufficiently low in viscosity for many processing applications, and the urethane acrylate layer including the urethane acrylate composition exhibits sufficient adhesion to the first layer and support layer.

Abstract: A composite structure includes a first layer and a support layer. The first layer is a show surface of the composite structure and is preformed from a polymer. The support layer includes a urethane acrylate composition that includes a urethane acrylate adduct. The urethane acrylate adduct is the reaction product of an isocyanate component and a stoichiometric excess of a functionalized acrylate component. The isocyanate component has at least two isocyanate groups. The functionalized acrylate component has at least one isocyanate-reactive functional group that is reactive with at least one of the isocyanate groups for forming the urethane acrylate adduct. The urethane acrylate composition also includes a catalyst system including a peroxide and a first metal salt. The resulting urethane acrylate composition is sufficiently low in viscosity for many processing applications, and the support layer including the urethane acrylate composition exhibits sufficient adhesion to the first layer.