Abstract: A storage-stable suspension of an epoxy resin hardener and a toughener useful as a molding composition is prepared via a) the addition of an organic solvent to an aqueous emulsion of the toughener when using a water-sensitive hardener, such as a polycarboxylic anhydride, removing the water as an azeotrope by vacuum distillation, then adding the epoxy resin hardener and removing the residual solvent by vacuum distillation, or b) the addition of an aqueous emulsion of the toughener with or without an organic solvent to the epoxy resin hardener when using a water-insensitive hardener such as a polyamine, and removing the water and any organic solvent by vacuum distillation.

Abstract: Storage-stable suspension comprised of a solid or liquid epoxy resin hardener and a solid or liquid toughener suspended therein is distinguished by excellent homogeneous dispersion of the toughener in the epoxy resin hardener and are suitable for preparing suspensions of curable epoxy resin compositions.

Abstract: Curing a curable composition comprising(a) 90 to 50% by weight of a diglycidyl ether of hydrogenated bisphenol A, a diglycidyl ether of hydrogenated bisphenol F, or a mixture thereof,(b) 50 to 10% by weight of a cycloaliphatic epoxy resin consisting of formula I, II, III ##STR1## or a mixture thereof, wherein R.sub.1 and R.sub.2 are each independently of the other a hydrogen atom or methyl, m is an interger from 2 to 6, X is a group ##STR2## R.sub.3 is hydrogen or methyl and n is an integer from 2 to 4, and the radical R.sub.3 may have different meanings within the molecule and the mixture of components (a) and (b) is 100% by weight,(c) a cycloaliphatic polycarboxylic anhydride as hardener, and, as additional optional component,(d) a curing catalyst,gives moulding or coatings having valuable thermomechanical properties and enhanced resistance to hydrolysis and weathering.