Epoxy resin compositions and cured products obtained therefrom

Composition curable by hardening agents comprise a polyepoxide and a dihydropyran compound of Formula I wherein X is -CO2R1, -CnH2nOR1, or epoxyalkyl, and R is -H or an alkyl radical having 1 to 5 carbon atoms; R1 being an epoxyalkyl radical or a radical of Formula II and n being an integer from 1 to 8. Many polyepoxides and dihydropyran compousnd are specified. The hardening agents used are those conventional for use with epoxy resins such as alkalis, alkali phenoxides, polycarboxylic acids and anhydrides, amines, amides and (poly)aminoamides, phosphonic acids and Friedel-Crafts metal halides. The curable compositions may also contain conventional additives such as extenders, e.g. oils, tars, pitches and petroleum distillates, and diluents such as unsaturated nitriles and butyl glycidyl ether. The compositions are used in preparing coating, impregnating and sealing compositions, foams, pottings, castings and adhesives. The subject matter of Specification 901,696 is disclaimed.