Patent ID: 7309663
Filing Date: 2007-12-18
Classification: B01D,B29C,B29K,B29L,B32B,Y10T

Abstract:
1. An air permeable and waterproof membrane for clothing comprising: an asymmetric porous polytetrafluoroethylene membrane for clothing and a woven or non-woven fabric, wherein said asymmetric porous polytetrafluoroethylene membrane for clothing has a dense skin layer and a continuously foamed porous layer; and the dense skin layer has an outer surface and an inner surface, the inner surface being the surface directly next to the porous layer, and the outer surface of the porous layer does not have an adhesive layer; (1) the contact angle of water to the surface of said skin layer is 120 to 140°; (2) the diffuse reflectance of light of said skin layer is 91 to 94%; and, the woven or non-woven fabric is laminated on the outer surface of the dense skin layer of said asymmetric porous polytetrafluoroethylene membrane for clothing.