Patent ID: 9611368
Date: 2017-04-04
CPC Classifications: B01D,C08J,H01M,Y02A,Y02E,Y02P

Claim:
1. A process for producing a cation exchange membrane, comprising: forming a first suspension of a metal salt of styrene sulfonate in an organic solvent; adding pyridinium chloride to said first suspension to form a second suspension; promoting a reaction in the second suspension to form a metal chloride byproduct precipitate and a monomer solution of styrene sulfonic acid, or a pyridine salt of styrene sulfonic acid, or a mixture of both styrene sulfonic acid and a pyridine salt of styrene sulfonic acid, in said organic solvent; collecting the monomer solution; providing a porous substrate; saturating porous regions of the substrate with a solution comprising the monomer solution, a crosslinking monomer, and a polymerization initiator; removing excess solution from the saturated porous substrate; and initiating polymerization to form a crosslinked ion transferring polymer in the porous regions of the substrate.