Sound dampening composition and method of using the composition

Details Sound dampening composition and method of using the composition Sound dampening composition and method of using the composition

G - Physics

10

K

403/39, 154/90.3

G10K 11/16 (2006.01) F02F 7/00 (2006.01) G10K 11/168 (2006.01) F01M 11/00 (2006.01) F02M 35/10 (2006.01)

Patent

CA 1313288

ABSTRACT OF THE DISCLOSURE The invention concerns constrained layer sound damping. A composition and a laminated struc- ture are provided for the reduction of noise coming from housings such as oil pans for automobiles. The composition comprises a rubbery polyurethane, an olefin polymer, and a filler. The laminated structure comprises the housing, the composition, and a sheet metal liner. The composition contains a blowing agent which is activated to provide a single unitary struc- ture which dampens noise. The polyurethane and olefin polymer are thoroughly intermixed with each other, but maintain their separate identities in the blend.

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