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    • 3. 发明专利
    • ACOUSTIC DAMPING
    • CA1161178A
    • 1984-01-24
    • CA362861
    • 1980-10-21
    • DU PONT
    • COE DAVID GPRICE DAVID W R
    • G10K11/162C04B38/10C08J9/42C08K3/00C08L21/00D06N7/00E04B1/74E04B1/82E04B1/84E04B1/98C09D3/48B32B25/10C08L21/02
    • An acoustic damping material is disclosed comprising a fibrous mat or polymeric cellular material coated with a dried composition selected from elastomeric and plasticised plastomeric latices or emulsions of styrenebutadiene rubbers, neoprene, polyvinyl chloride, or ethylene-vinylacetate copolymers or mixtures of two or more thereof, the composition containing a filler having a specific gravity of at least 2.5 and a particle size of from 1 to 200 microns, the amount of filler being effective to provide from 60 to 85% total solids by weight of wet composition prior to drying, together with an amount of an anionic or non-ionic surfactant effective to stabilise the rubber, neoprene, polyvinyl chloride, or ethylene-vinylacetate copolymer. The method of preparing it and a composition suitable for application to the desired fibrous mat or polymeric cellular material substrate are also enclosed. The use of neoprene latices and of fillers having a specific gravity of 3 or more, for example barytes, is desirable and the preferred substrate is compressed or uncompressed glass fibre. The composition is retained as a coating on the substrate by mechanical adhesion, thereby obviating disadvantages inherent in other forms of adhesion and the material is of particular application in the automobile industry.