Low viscosity polyurethane acrylate hybrid composition for rigid and tough products

A method of preparing a polyurethane acrylate hybrid composition comprising, combining to form a mixture:

• an isocyanate component including one or more isocyanate compounds;
• an isocyanate-reactive component comprising one or more polyether polyols, wherein the isocyanate-reactive component has a viscosity of 600 cP or less;
• and
• an optional third component;
• wherein one or more (meth)acrylate monomers having an acrylate functionality in the range of 2 to 8, and one or more initiators are, independently, present in at least one of the isocyanate component, the isocyanate-reactive component, or the optional third component;
• and
• reacting the mixture to form the polyurethane acrylate hybrid composition.

A method of preparing a composite article, comprising:

• disposing on a substrate or extruding through a die chamber, a polyurethane acrylic hybrid composition prepared by combining to form a mixture:
• an isocyanate component including one or more isocyanate compounds;
• an isocyanate-reactive component comprising one or more polyether polyols, wherein the isocyanate-reactive component has a viscosity of 600 cP or less;
• an optional third component, and
• a reinforcement material;
• wherein one or more (meth)acrylate monomers having an acrylate functionality in the range of 2 to 8, and one or more initiators are, independently, present in at least one of the isocyanate component, the isocyanate-reactive component, or the optional third component;
• curing the mixture to produce the composite article.