NEW DIGLYCIDYL ETHERS OF BINUCLEAR, FIVE-MEMBERED OR SIX-MEMBERED, UNSUBSTITUTED OR SUBSTITUTED N-HETEROCYCLIC COMPOUNDS CONTAINING STYRENE OXIDE AS AN ADDUCT, WHICH POSSESS TWO N ATOMS PER HETEROCYCLIC RING, OBTAINED BY REACTION OF BINUCLEAR, FIVE-MEMBERED OR SIX-MEMBERED, UNSUBSTITUTED OR SUBSTITUTED N-HETEROCYCLIC COMPOUNDS, SUCH AS BIS-(HYDANTOIN) OR BIS-(DIHYDROURACIL) COMPOUNDS, FOR EXAMPLE 1,1''-METHYLENE-BIS-(5,5-DIMETHYLHYDANTOIN), BIS-(5,5-DIMETHYLHYDANTOINYL-3)-METHANE OR 1,1''-METHYLENE-BIS-(5,6-DIHYDROURACIL), WITH STYRENE OXIDE TO GIVE THE APPROPRIATE MONOHYDROXY OR DIHYDROXY COMPOUNDS, AND SUBSEQUENT GLYCIDYLATION OF THE OH GROUPS OR OF THE OH GROUP AND NH GROUP TO GIVE THE CORRESPONDING GLYCIDYL ETHERS.