Method of using a sound damping composition

Details Method of using a sound damping composition Method of using a sound damping composition

1990-08-27

1992-09-01

Welsh, Maurice J.

Coating processes

With post-treatment of coating or coating material

Heating or drying

4273741, 4273855, 521 99, 521137, 525123, 525131, 525185, C08G 1814

Patent

active

051437554

ABSTRACT:
The invention concerns a method of using 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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