Patent ID: 9669608
Date: 2017-06-06
CPC Classifications: B01D,B32B,C08J,Y10T

Claim:
1. A porous polytetrafluoroethylene composite comprising: a porous polytetrafluoroethylene film with a mean flow pore diameter of less than 40 nm; a porous support layer that supports the porous polytetrafluoroethylene film; a first adhesive layer disposed between the porous support layer and the porous polytetrafluoroethylene film; a second adhesive layer bonded to the porous polytetrafluoroethylene film; and a porous reinforcement layer bonded to the second adhesive layer, the second adhesive layer being disposed between the porous reinforcement layer and the polytetrafluoroethylene film; wherein the second adhesive layer is a layer composed of a fluororesin having a melting point of lower than 220° C., or a glass transition point when a melting point is not clearly defined, of lower than 220° C., and wherein the first adhesive layer and the second adhesive layer are made of different compositions.