Importance

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Abstract

The invention is directed at methods, materials, and articles for sound mitigation. The article for sound mitigation is a multi-layered composite article comprising a reinforcing substrate layer and a foam layer. The reinforcing substrate layer includes a fiber phase and a polymer phase. The fiber phase preferably includes one or more natural fibers. The natural fibers may be present at a concentration of about 60 wt. % or more, based on the total weight of the reinforcing substrate layer. The polymer phase is preferably a continuous phase and preferably has a glass transition temperature sufficiently high so that the panel maintains its stiffness at elevated temperatures. The concentration of the polymer phase may be about 10 wt. % or more, based on the total weight of the reinforcing substrate layer. Preferably both the foam layer and the reinforcing substrate layer are effective in reducing the transmission of a sound.

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First Claim