초록 ▼

The present invention provides a distinct advancement over presently known ion-exchange composite membranes, and the techniques for making such membranes. In one embodiment of the present invention, this is accomplished by a thin integral composite membrane comprised of a microporous polymer film, s

The present invention provides a distinct advancement over presently known ion-exchange composite membranes, and the techniques for making such membranes. In one embodiment of the present invention, this is accomplished by a thin integral composite membrane comprised of a microporous polymer film, such as expanded polytetrafluoroethylene having a porous microstructure defined by polymeric fibrils, which provides a reinforcing support that supports an ion-exchange polymer resin or material on one side of the porous polymeric film and supports another different ion-exchange polymer resin on the other side. Thus, the invention uses two different ion-exchange resins on each side of a porous polymeric support film. By employing ionic exchange resins which differ in structure, functional groups or equivalent weight, or a combination of such, a wide variety of composites can be made and tailored to specific end uses.

대표청구항 ▼

[ We claim:] [1.] A composite membrane consisting essentially ofa support of a microporous polymeric sheet in laminar attachment with a porous fabric said support having impregnated in the pores on one side thereof a first ion-exchange material, and having impregnated on the opposing side a second i

[ We claim:] [1.] A composite membrane consisting essentially ofa support of a microporous polymeric sheet in laminar attachment with a porous fabric said support having impregnated in the pores on one side thereof a first ion-exchange material, and having impregnated on the opposing side a second ion-exchange material; each of said first and second ion-exchange materials fully filling and occluding the pores at least near the surface of the one side and the opposing side, respectively, of said support, and wherein said first and second ion-exchange materials differ from one another in structure, functional groups, or equivalent weight, or a combination of such.