Epoxy composition containing acrylate based toughening agent

A curable composition, consisting essentially of:

• (A) a first component consisting essentially of:
• from 5.0 wt % to 20.0 wt %, based on the total weight of the first component, of a toughening agent component including a Bisphenol F based epoxy resin and an urethane acrylate component, the Bisphenol F based epoxy resin being present in an amount from 30.0 wt % to 45.0 wt % and the urethane acrylate component being present in an amount from 50.0 wt % to 70.0 wt %, based on the total weight of the toughening agent component, the Bisphenol F based epoxy resin including only liquid epoxy resins, the urethane acrylate component including the capping reaction product of an acrylate and an isocyanate-terminated prepolymer, the isocyanate-terminated prepolymer being the reaction product of a polyisocyanate and at least a DMC derived polyol having a molecular weight of at least 3000 g/mol and a degree of unsaturation that is less than 0.100 meq/g polymer;
• a hardener component that includes at least one amine based hardener and is present in a ratio of 0.8 to 1.2, based on a number of equivalents of amino hydrogen groups in the hardener component to a number of equivalents of reactive groups in the first component capable of forming a covalent link with the amine reactive groups in the hardener;
• and
• an epoxy base component that accounts for a remainder of the total weight of the first component and that includes at least one epoxy resin separately provided from the Bisphenol F based epoxy resin;
• (B) an optional second component consisting essentially of at least one of a filler, wherein the Bisphenol F based epoxy resin is a liquid epoxy resin that is an unmodified bisphenol F based liquid.