Toughened epoxy resin based composition

Resin component for a one or two-component adhesive, matrix resin, or a foam structure, comprising: C1) at least one epoxy resin having on average more than one epoxy group per molecule, which does not correspond to the definition of the components C2; C2) at least one oligomeric or polymeric urethane group-free polyether compound. Single- or two-component epoxy adhesive, structural foam or matrix material for composites containing said resin component.