| abstract |
The present invention pertains to a method for producing a thermoplastic aromatic polysulfone resin, said method comprising polymerizing, in an organic solvent, a mixture containing (A) a dihalogeno compound represented by formula (I), (B) a divalent phenol represented by formula (II), and (C) an alkali metal carbonate at a molar ratio satisfying formulae (1)-(3): (1) 0.900 < (A)/(B) < 0.990; (2) ((A)/(B)) - 0.02 < (C)/(B) < ((A)/(B)) + 0.01; and (3) (C)/(B) < 1.00 (in formulae (I) and (II), R 1 -R 4 represent an alkyl group having 1-4 carbon atoms or an alkoxy group having 1-4 carbon atoms, X and X' represent a halogen atom, Y represents a single bond or at least one radical selected from the group consisting of -SO 2 -, -C(CH 3 ) 2 -, -CH 2 -, -O-, and -CO-, and n1, n2, n3, and n4 represent an integer of 0-4). |