Patent ID: 8637150

Claim:
A multilayer film or sheet having a total thickness of about 2 mils to about 20 mils comprising a first surface sub-layer, a second surface sub-layer, and one or more inner sub-layers sandwiched between the first and second surface sub-layers, wherein (a) the first surface sub-layer and the second surface sub-layer each have a thickness of about 0.5 mils to about 3 mils and consist essentially of a non-neutralized acid terpolymer; (b) the one or more inner sub-layer(s) has a thickness of about 0.5 mils to about 20 mils and comprises an ionomer having a melting point of at least about 90° C., said ionomer derived from an acid copolymer that comprises repeat units derived from ethylene and an α,β-ethylenically unsaturated carboxylic acid selected from the group consisting of acrylic acid and methacrylic acid; and (c) the acid terpolymer comprises repeat units derived from ethylene, about 7 to about 11 wt % of repeat units derived from an α,β-ethylenically unsaturated carboxylic acid selected from the group consisting of acrylic acid and methacrylic acid, and about 20 to about 30 wt % of repeat units derived from alkyl ester of acrylic acid or methacylic acid, based on the total weight of the terpolymer; and further wherein, in a laminate comprising said multilayer film or sheet bonded to a glass layer, said multilayer film or sheet does not delaminate from the glass layer after exposure to a temperature of about 75° C. or higher and a relative humidity of about 85% or higher for a period of about 750 hours or longer.