Acoustic damping

Details Acoustic damping Acoustic damping

C - Chemistry, Metallurgy

08

L

400/4004, 117/43

C08L 21/02 (2006.01) B32B 25/10 (2006.01) C08J 9/42 (2006.01) C08K 3/00 (2006.01) C08L 21/00 (2006.01) D06N 7/00 (2006.01) E04B 1/82 (2006.01) E04B 1/74 (2006.01)

Patent

CA 1161178

ABSTRACT 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 styrene- butadiene 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 in- herent in other forms of adhesion and the material is of particular application in the automobile industry.

362861

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