Sound damping composition and method of using the composition

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

1989-03-06

1990-08-28

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521137, 524700, 525185, C08G 1814

Patent

active

049526103

ABSTRACT:
The invention concerns constrained layer sound damping. A composition and a laminated structure 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 structure which dampens noise. The polyurethane and olefin polymer are thoroughly intermixed with each other, but maintain their separate identities in the blend.

REFERENCES:
patent: 4792574 (1988-12-01), Berkowitz

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