Abstract: The present invention relates to the radical cold curing of synthetic resins based on poly(meth)acrylate-urethane(meth)acrylates in urethane(meth)acrylates and optionally (meth)acrylates and/or reactive diluents using suitable additives, and also the use of these radically cold-curable synthetic resins as binding agents in radically cold-curable mixtures, as well as the organic synthetic glasses/plastics, synthetic glass/plastic workpieces and composite materials and workpieces obtained from these mixtures by radical cold curing, and also the production and use of these same mixtures, organic synthetic glasses/plastics, synthetic glass/plastic workpieces and composite materials and workpieces.