SOLID POLYMER ELECTROLYTE MEMBRANE, MEMBRANE ELECTRODE ASSEMBLY FOR SOLID POLYMER FUEL CELL, AND METHOD FOR PRODUCING SOLID POLYMER ELECTROLYTE MEMBRANE

摘要

A solid polymer electrolyte membrane which is excellent in mechanical strength, chemical stability and dimensional stability is disclosed. The solid polymer electrolyte membrane comprises at least one layer composed of a porous sheet having many through holes which have an average area from 1 x 10<-3> to 20 mm<2> per hole and are generally parallel to each other in the thickness direction. The porous sheet has an open area ratio of 30-80% which is ascribable to the through holes, and the through holes are filled with a ion-exchange resin.