| http://www.w3.org/ns/prov#value | - us polytetrafluoroethylene having a microstructure containing nodes connected to one another by fibers (Claim 23), or a porous polyvinylidene fluoride structure (Claim 25).D2 also discloses a process for producing the porous structure, which comprises impregnating the pores of a porous fluorocarbon resin with at least one water-soluble polymer including polyvinyl alcohol, and water-insolubilizing
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