Patent ID: 7276561
Filing Date: 2007-10-02
Classification: C08J,H01M,Y02E,Y02P

Abstract:
1. A process for producing a polymer ion-exchange membrane comprising the steps of: irradiating a polymer film substrate with high-energy heavy ions to form irradiation damage; etching the irradiation damage chemically or thermally to form fine cylindrical through-holes in the film substrate such that they have an average diameter of at least 10 nm and range in number from 10 adding to the resulting perforated film substrate at least one monomer selected from the group consisting of monomers having a sulfonyl halide group, namely, CF degassing the added monomer or monomers; applying γ-rays, X-rays or electron beams as an ionizing radiation, thereby graft polymerizing the monomer or monomers on a surface of the film substrate or within the holes; and converting the [—SO