CATION-EXCHANGE FLUORINATED MEMBRANE FOR ELECTROLYSIS AND PROCESS FOR PRODUCING THE SAME

摘要

A cation-exchange membrane for electrolysis which comprises a fluoropolymer having ion-exchange groups and a porous base. It is characterized by having, on the anode-side surface of the membrane, protrusions comprising a polymer having ion-exchange groups. It is further characterized in that : when the average value of the heights of the tops of the protrusions from the anode-side surface of the membrane is expressed as h (µm), then 20 ‰¦ h ‰¦ 150; when the density of the protrusions distributed is expressed as P (protrusions per cm 2 ) then 50 ‰¦ P ‰¦ 1,200; when the average proportion of the areas of those bottom parts of the protrusions which are on the same level as the anode-side surface of the membrane to the area of the anode-side surface of the membrane is expressed as S (cm 2 /cm 2 ), then 0.001 ‰¦ S ‰¦ 0.6; and when the average proportion of the areas of the top parts of the protrusions to the area of the anode-side surface of the membrane is expressed as T (cm 2 /cm 2 ), then T ‰¦ 0.05.