Patent ID: 7288290

Claim:
A process for applying a multi-component composite sound damping coating to a substrate comprising: a) providing a substrate having two major surfaces; b) applying at least one first coating composition to at least a portion of at least one major surface of the substrate, wherein the first-applied coating composition is a curable film-forming composition comprising: (1) at least one polymer having reactive functional groups; and (2) at least one curing agent having functional groups reactive with the functional groups of the polymer of (1); c) applying at least one second coating composition over at least a portion of the first-applied coating composition, wherein the modulus of elasticity of the first-applied coating composition after curing is at least 50 MPa lower than that of the second-applied coating composition after curing; and d) curing one or both of the first-applied and second-applied coating compositions to form a multi-component composite coating on the substrate; wherein the coated substrate has a sound damping value of 0.1 or greater Oberst dissipation factor as determined at a normalized value of 200 Hz in accordance with ASTM E-756-98, over a temperature range of at least 20 Celsius degrees.