ADHESIVE INTERLAYER SUITABLE FOR CONSTRAINED LAYER VIBRATION DAMPING

摘要

An interlayer which is self-adherent to a base panel and a constraining sheet to form a constrained layer damped structure is provided, the interlayer being a dispersion of visco-elastic polymer having a loss tangent of at least 0.5 in a continuous phase of acidic copolymer, e.g., ethylene/methacrylic acid, with the carboxylic acid groups being neutralized from 0 to 50 percent with metal irons, e.g., sodium. When the visco-elastic polymer is polyurethane, the peel strength of the interlayer is increased, which makes the inter layer useful in a system primarily for adhesive purposes. In another constrained layer damped structure, the interlayer is a composite of a layer of the visco-elastic polymer sandwiched between films of the acidic copolymers.