Abstract: A multi-functional epoxy resin with good high temperature properties allowing prolonged service at temperatures above 120.degree. C. is derived from a precursor of formula (I): ##STR1## in which R.sup.3 to R.sup.8 inclusive are independently selected from hydrogen, C.sub.1 to C.sub.3 alkyl or halo-alkyl and R.sup.9 is hydrogen, alkyl or halogen, and in which n has the value 0, 1 or 2. The precursor (I) may be self-coupled or cross-coupled with precursors of other epoxy compounds of the TGDDM type. Such cross-coupling gives rise to a complex mixture containing not only the mixed product, but also the self-coupled products of each constituent. Regardless of the precise chemical make-up of the mixture, the observed glass transition temperature is higher than for TGDDM resins formed without precursor (I). If the substituent at the R.sup.9 position is alkyl or halogen, oligomer formation is suppressed and a less complex mixture results.

Abstract: An epoxy compound includes one or two aromatic rings, one N-diglycidyl group per aromatic ring and one or two halogen or halogen-containing groups per aromatic ring, the epoxy compound having the general formula: ##STR1## in which Y is selected from A and ##STR2## each A being independently selected from halogen, halogen containing group and H, provided that at least one of the groups A per aromatic ring is a halogen or halogen containing group. In any one compound, when A is a hologen or halogen containing group, it is preferred that each A is the same.When the epoxy compound contains only one aromatic ring the group A may be a polyfluoroalkyl group in which case one or two such groups may be attached to the aromatic ring; or a polyfluoro-alkoxy group, in which case only one such group is attached to the aromatic ring.When the epoxy compound contains two aromatic rings, the group A may be Cl, Br, or a polyfluoroalkyl group and one or two such groups may be attached to each aromatic ring.