The present invention relates to a blend containing an epoxy resin, a cyclic carbonate and a hardener containing a polyalkoxypolyamine, a further amine and a catalyst, a process for producing this blend, the use of the blend according to the invention for producing cured epoxy resin and an epoxy resin which has been cured by means of the blend according to the invention, in particular fibre-reinforced cured epoxy resins for use in rotor blades for wind turbines.