Abstract: There are provided an ion-exchange polymer including a structure represented by the following General Formula (1) and a production method therefor, an electrolyte membrane and a production method therefor, and a composition for producing an ion-exchange polymer. In a case where the sum of a1, b1, and c1 is 1.000, a1 is 0.000 to 0.750, b1 is 0.240 to 0.990, and c1 is 0.001 to 0.100. L represents an alkylene group, L1 and L2 each represent a divalent linking group, R1 is a hydrogen atom or an alkyl group, R2 and R3 each represent an alkyl group or an allyl group, X1? and X2? each represent an inorganic or organic anion, and Y represents a halogen atom. Z1 represents —O— or —NRa—, and Ra represents a hydrogen atom or an alkyl group.

Abstract: Provided is a functional polymer membrane having a structure represented by the following Formula (1) and a structure represented by the following Formula (2), in which an ion exchange capacity is 2.0 meq/g to 7.

Abstract: Provided are a curable composition including a compound expressed by General Formula (1) below; a polymerization initiator; and a chain transfer agent, and a cured polymer product. In General Formula (1), m represents an integer of 1 to 4, and n represents an integer of 1 to 4. Here, a sum of m and n is not greater than 5. MA represents a hydrogen ion, an inorganic ion, or an organic ion. Here, an inorganic ion and an organic ion may be bivalent or higher ions. Each of R1 and R2 independently represents a hydrogen atom or an alkyl group.