Patent ID: 8476324

Claim:
A method for manufacturing an anion exchange resin comprising the following steps (1-a) to (1-e) of: (1-a) obtaining a cross-linked copolymer by copolymerizing a monovinyl aromatic monomer and a cross-linkable aromatic monomer; (1-b) specifying the content of the leachable compound represented by the following formula (I) to be 400 μg or less relative to 1 g of the cross-linked copolymer of the monovinyl aromatic monomer and the cross-linkable aromatic monomer, in the formula (I), Z represents a hydrogen atom or an alkyl group, and 1 represents a natural number; (1-c) haloalkylating the cross-linked copolymer having a content of the leachable compound of 400 μg or less relative to 1 g of the cross-linked copolymer with a haloalkylating agent which enables the formation of a leachable compound represented by the following formula (II), so as to introduce 80 percent by mole or less of haloalkyl group relative to the monovinyl aromatic monomer; (1-d) removing the leachable compound represented by said formula (II) from the haloalkylated cross-linked copolymer, in the formula (II), X represents a hydrogen atom, a halogen atom, or an alkyl group which may be substituted by a halogen atom, Y represents a halogen atom, and m and n represent independently a natural number; and (1-e) subjecting the haloalkylated cross-linked copolymer, from which the leachable compound has been removed, to a reaction with an amine compound, wherein said leachable compound represented by formula (I) is a byproduct which is obtained in copolymerization of the monovinyl aromatic monomer and the cross-linkable aromatic monomer and which is unreacted or insufficiently reacted, and said leachable compound represented by formula (II) is the haloalkylated product of said leachable compound represented by formula (I).