Abstract: Provided is an ion exchange film including a resin which is disposed in pores of a porous support and made of a styrene-acryl copolymer having a structure expressed by General Formula (PI) or (PII) below, a composition for forming the film, and a production method therefor. R1 and R2 represent a hydrogen atom or an alkyl group, Y1 and Y2 represent —O— or —N(Rx)-, and Rx represents a hydrogen atom or an alkyl group. L1 represents a p1+1-valent linking group having 2 or more carbon atoms, L2 represents a bivalent linking group, p1 represents an integer of 1 or greater, and n1, n2, and m1 represent integers of 1 or greater. Ra to Rg represent alkyl groups or aryl groups, 2 or 3 of Ra to Rc may be bonded to each other to form a ring, and 2 to 4 of Rd to Rg are bonded to each other to form a ring. X1? to X4? represent an organic or inorganic anion.

Abstract: The present invention provides a polymer functional film obtained by polymerizing and curing a composition including (A) a styrene-based monomer represented by Formula (HSM); (B) a crosslinking agent represented by Formula (CL); and (C) a polymerization initiator represented by Formula (PI-1) or (PI-2), and a method for producing the same: in which R1 represents a halogen atom or —N+(R2)(R3)(R4)(X1?); n1 represents an integer from 1 to 10; here, R2 to R4 each independently represent a particular substituent; X1? represents an organic or inorganic anion; L1 represents an alkylene group or an alkenylene group; Ra, Rb, Rc and Rd each independently represent a particular substituent; n2 and n4 each independently represent an integer from 1 to 10; X2? and X3? each independently represent an organic or inorganic anion; and R5 to R10 each represent a hydrogen atom or a particular substituent.