Combined sound and moisture vapor barrier sheet materials...

Details Combined sound and moisture vapor barrier sheet materials... Combined sound and moisture vapor barrier sheet materials...

B - Operations, Transporting

32

B

B32B 27/32 (2006.01) B32B 5/22 (2006.01) D06N 7/02 (2006.01) E04F 15/18 (2006.01)

Patent

CA 2429465

Flexible sheet materials having a foam layer and a film layer of polymer materials, at least one of the layers being formed from a filled polymer resin composition containing filler material comprising 30% to 65% by weight of the composition. The filled resin composition includes an ethylene copolymer such as ethylene vinyl acetate and may include other polymers such as polyethylene. The film layer serves a vapor barrier function. The layer having the filler provides a sound transmission loss. A preferred embodiment of an underlayment has a filler resin film layer of 6 to 30 mils thickness and a polymer foam layer of 75 mils thickness, the underlayment providing a sound transmission loss of at least about 2.5 dB at 1000 Hz.

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