presented in epoxy resins chemistry and technology second edition edited by clayton a may marcel dekker inc new york 1988 chemistry and technology of epoxy resins edited by b ellis blackie academic amp professional glasgow 1993 handbook of epoxy resins by h e lee and k neville mcgraw hill n y 1967 and ep 1116774 a2 suitable epoxy resins are but not limited to epoxy resins based on bisphenols and polyphenols such as bisphenol a tetramethylbisphenol a bisphenol f bisphenol s tetrakisphenylolethane resorcinol 4 4 u2032 biphenyl dihydroxynaphthylene and epoxy resins derived from novolacs such as phenol formaldehyde novolac cresol formaldehyde novolac bisphenol a novolac biphenyl toluene xylene or mesitylene modified phenol formaldehyde novolac aminotriazine novolac resins and heterocyclic epoxy resins derived from p amino phenol and cyanuric acid additionally aliphatic epoxy resins derived from 1 4 butanediol glycerol and dicyclopentadiene skeletons are suitable for example many other suitable epoxy resin systems are available and would also be recognized as being suitable by one skilled in the art it is generally advantageous to use an epoxy resin which possesses on average more than 1 and preferably at least 1 8 more preferably at least 2 epoxy groups per molecule in the most preferred case the epoxy resin is a novolac epoxy resin with at least 2 5 epoxy groups per molecule in the broadest aspect of the invention the epoxy resin may be any saturated or unsaturated aliphatic cycloaliphatic aromatic or heterocyclic compound which possesses more than one 1.