Adhesives from divalent metal salts of mono(hydroxyethyl)phthalate,anhydrides, and bisepoxides

Systems of divalent metal salts of mono(ydroxyethyl)phthalate-anhydride-bisepoxide were evaluated as adhesives. The bisepoxides, bisphenol A diglycidyl ether (BADG) and hexahydrophthalic acid diglycidyl ester and the anhydrides, maleic anhydride and hexahydrophthalic anhydride (HPA) were used. The adhesive properties of the above metal-containing systems were generally superior to those of the systems not containing metal, due to the polarity effect of metal carboxylate groups. The effect of introducing metal (ionic links) on tensile shear and peel strenghths clearly appeared, especially in the metal salt-HPA-BADG systems.