Abstract: A multilayer polymeric sheet comprising three layers is provided. The two outer layers of the multilayer polymeric sheet comprise an ionomeric composition and are positioned on either side of the inner layer of the multilayer polymeric sheet, which comprises an ethylene vinyl acetate (EVA) composition. Further provided is a laminate comprising the multilayer polymeric sheet, for example, a glass laminate. Preferred laminates exhibit a sound transmission class of greater than 25, as measured by ASTM E314, or an effective stiffness by bending of about 3.0 mm to about 5.0 mm, as measured by ASTM C158. Also preferably, the laminate has an areal density that is lower than that of a glass monolith of comparable thickness.

Abstract: Provided herein is a method of designing a strong lightweight laminate. This method uses effective thickness principles to calculate the structure of a laminate that has strength equal to that of a monolith of equal thickness. In a preferred application of the method, safety glass laminates are designed. The safety glass laminates have lower areal weight at equal strength, compared to a monolithic glass sheet of thickness equal to that of the safety glass laminate.

Abstract: Provided herein are interlayer sheets formed of an acid copolymer composition, which comprises an acid copolymer resin or an ionomer that is the neutralized product of the acid copolymer resin. The acid copolymer resin comprises copolymerized units of an ?-olefin having 2 to 10 carbon atoms; about 10 to about 25 wt % of copolymerized units of a first ?,?-ethylenically unsaturated carboxylic acid having 3 to 10 carbon atoms; and about 15 to about 30 wt % of copolymerized units of a derivative of a second ?,?-ethylenically unsaturated carboxylic acid having 3 to 10 carbon atoms. In addition, the acid copolymer resin has a melt flow rate of about 1 to about 400 g/10 min. Light weight safety laminates comprising these interlayer sheets are characterized by good strength and superior acoustic damping, due to the properties of the acid copolymer composition.