of 1 4 c atoms or ch 2 cl y is an integer of from 0 10 and z is an integer of from 2 to 6 are prepared by reacting a polythioetherpolythiol with an olefinically unsaturated epoxide or by dehydrohalogenating the corresponding halohydrins the new compounds are useful as diluents for epoxy resins to reduce their viscosity and to improve flexibility of the cured resins application_number US 20254671 A description the precursor halohydrins used for making the polythioetherpolyepoxides of this invention are prepared by reacting a polymercaptan i e any mercaptan having 2 or more sh groups with an olefinically unsaturated ether halohydrin preferably terminally monoolefinically unsaturated to thereby form an adduct in which at least two of the sh groups on the polymercaptan will each add across an olefinically unsaturated portion of the ether halohydrin the product resulting from such addition will contain at least two halohydrin groups in which the halogen and oh groups are vicinal to each other on individual carbon chains representative olefinically unsaturated monoepoxides which can be reacted with the polythiols include allyl glycidyl ether 2 allyloxy ethyl glycidyl ether 4 butenyl glycidyl ether str4 the polythiol can be an aliphatic oxaalkyl polyoxaalkyl thiaalkyl or polythiaalkyl group containing from 2 to 12 carbon atoms with the provision that the thiol groups are separated by at least two carbon atoms examples of suitable polythiols include 1 2 ethanedithiol 1 3 propanedithiol bis 2 mercaptoethyl ether bis 2 mercaptoethyl sulfide.