Patent ID: 8758954
Filing Date: 2014-06-24
Classification: B01D,C08J,H01M,Y02E,Y02P

Abstract:
1. A process for preparing a substantially non-porous membrane having weakly acidic or weakly basic groups comprising the steps of: (i) applying a curable composition to a support; (ii) curing the composition for less than 30 seconds to form a membrane; and (iii) optionally removing the membrane from the support; wherein the curable composition comprises (i) 10 to 99 parts in total of crosslinking agent(s) comprising two acrylic groups; (ii) 10 to 99 parts in total of curable compounds having one acrylic group, at least ten of which have one or more groups selected from weakly acidic groups, weakly basic groups and groups which are convertible to weakly acidic or weakly basic groups; (iii) 0 to 50 parts in total of crosslinking agent(s) comprising more than two acrylic groups; and (iv) 0 to 10 parts in total of compounds which are free from acrylic groups and comprise one or more methacrylic groups; and (v) 0.01 to 5 parts in total of photoinitiator(s); wherein the membrane is an anion exchange membrane or a cation exchange membrane and all parts are by weight and the number of parts of (i), (ii), (iii), (iv) and (v) add up to 100.