초록 ▼

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 co

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.

대표청구항 ▼

An automotive component enclosure comprising: a stamped metal housing having internal surfaces which define an internal cavity; at least one thin metal liner which is attached to an internal surface of said metal housing and conforms to the surface to which it is attached; a constrained layer of foa

An automotive component enclosure comprising: a stamped metal housing having internal surfaces which define an internal cavity; at least one thin metal liner which is attached to an internal surface of said metal housing and conforms to the surface to which it is attached; a constrained layer of foamed viscoelastic compound between each internal surface and liner, said compound comprising at least two polymers which form a heterogeneous mixture in the compound, containing from 15% to 35% by weight of filler which has a specific gravity of from about 2.4 to about 3.0 and being resistant to degradation after being soaked in lubricant at an elevated temperature; said constrained layer being adhered to the internal surface and the liner as the result of the activation of a blowing agent therein, said liner and constrained layer forming a unitary structure with said metal housing which suppresses the transmission of sound.