An ionomer resin, a film or sheet of the ionomer resin and laminated articles having a lamina of the ionomer resin film are provided. The ionomer resin consists of ionically crosslinked ethylene-methacrylic acid copolymer or ethylene-acrylic acid copolymer which is neutralized with a polyamine, preferably a diamine, that contains at least one R--CH.sub.2 --NH.sub.2 group and the R may contain: (--CH.sub.2 NH.sub.2).sub.x ; (--NH.sub.2).sub.x ; or (R'R"NH).sub.y where x=1 or more, y=0 or more. The polyamine neutralized ionomer resin may be formed into a film or sheet which may be self-supporting or may be laminated to glass to form a safety glass.