Patent ID: 7344772

Claim:
A strip to be inserted between two substrates to cause acoustic attenuation of noise propagating through at least one of the two substrates, wherein the strip is formed from at least one plastic-based damping material, wherein the strip has an equivalent real stiffness per unit length K′ eq equal to at least 25 MPa and an equivalent loss factor tan δ eq equal to at least 0.25, wherein at least one damping material is a one-component polyurethane that has an NCO percentage content of between 0.5 and 2% and comprises: at least one polyesterpolyol with a functionality of two, an OH index iOH of between 5 and 10, a glass transition temperature T g of −50° C. or below, and a softening point between 50 and 80° C.; at least one polyesterpolyol with a functionality of two, having an index iOH between 50 and 100 and a glass transition temperature T g of −50° C. or below; at least one isocyanate with a functionality of between 2.1 and 2.7 of the MDI type, and having an NCO percentage content of between 11 and 33%; at least one catalyst; and optionally, at least one filler.