Membranes comprising sulfonated polyether ketone and another polymer, process
for their production, and their use, Membranes comprising from 30 to 99.5% by weight
of a sulfonated, strictly alternating polyether ketone (A) having repeat units
of the formula (I) -Ar-O-Ar-CO-, where Ar and Ar, independently
of one another, are bivalent aromatic radicals, with an ion exchange capacity of
from 1.3 to 4.0 meq of -SO3H/g of polymer and from 0.5 to 70% by weight
of a partially fluorinated, nonfluorinated or perfluorinated polymer (B) are described.
The membranes may be used in fuel cells.
