Method for manufacturing anion exchange resin, anion exchange resin, method for manufacturing cation exchange resin, cation exchange resin, mixed bed resin, and method for manufacturing ultrapure water for washing electronic component material

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).