Classic vinylester resins and the two-component injection mortars made from them combine the good thermal and mechanical properties of epoxy resins with simple and quick processability of unsaturated polyester resins. These vinylester resins of the new development generation are styrene-free, and dimethacrylates are used as the reactive solvent. The vinylester resins and the reaction resin mortars made from them stand out by virtue of, their very high chemical resistance, among other things, especially in alkali media.