Air permeable waterproof bicomponent film

Details Air permeable waterproof bicomponent film Air permeable waterproof bicomponent film

2008-11-21

2011-11-01

Vo, Hai (Department: 1788)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

C428S319300, C428S319700, C428S308400, C428S306600, C156S060000

Reexamination Certificate

active

08048516

ABSTRACT:
A waterproof, vapor-permeable and gas-permeable sheet material and a method of making are provided. The sheet material includes a waterproof microporous layer and a thermoplastic layer attached to the microporous layer. The thermoplastic layer is vapor-permeable and air-permeable. The microporous layer is at least partially integrated with the thermoplastic layer to form a zone that prevents passage of water droplets, while permitting passage of water vapor and air, when a chemical is present on the sheet material that would otherwise cause the microporous layer to permit passage of water droplets. The Zone can be considered to be resistant to chemical interference with at least the waterproof property of the microporous layer and inhibits detachment of the layers.

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European Search Report dated Apr. 1, 2010.

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