| abstract |
At least one water vapor permeable film layer and at least one substrate layer, wherein the water vapor permeable film comprises (i) at least one film forming polymer and at least one inert porous filler, and (ii) 1000 g / m 2 / day A layered, water vapor permeable composite is disclosed which has a rate of water vapor permeation above and which is (iii) activated. Representative film forming polymers include ethylene interpolymers and representative fillers include silica glass beads. One exemplary method of activating the film is to apply sufficient pressure to the film such that the glass beads press and break in the film matrix. |