Method for producing thermoplastic aromatic polysulfone resin, method for producing epoxy composition, and method for producing cured epoxy product

A method for producing thermoplastic aromatic polysulfone resin, comprising:

• performing polymerization reaction of compound (A), a dihalogeno compound represented by Formula (I), compound (B), a divalent phenol represented by Formula (II), and compound (C), an alkali metal carbonate, in an organic solvent at a charging molar ratio satisfying the following Formulae (1) to (3):
• 0.910≤(A)/(B)≤0.962;
• (1)
• {(A)/(B)}−0.02<(C)/(B)<{(A)/(B)}+0.01, and;
• (2)
• (C)/(B)<1.00;
• (3)
• wherein in Formulae (I) and (II), R1 to R4 each independently represents an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, X and X′ each independently represents a halogen atom, Y represents one or more groups selected from the group consisting of —SO2—, —C(CH3)2—, —CH2—, —O— and —CO—, or a single bond, and n1, n2, n3 and n4 each independently represents an integer of 0 to 4, and in a case where n1, n2, n3 or n4 is an integer of 2 to 4, a plurality of R1, R2, R3 or R4 may be the same as or different from each other.