	US 12,319,785 B2
	Method for producing aromatic polyether, and potassium carbonate used in same
Koichi Suga, Sodegaura (JP); Minoru Senga, Sodegaura (JP); Hiromu Kumagai, Sodegaura (JP); and Yuko Murakami, Ichihara (JP)
Assigned to IDEMITSU KOSAN CO., LTD., Tokyo (JP)
Appl. No. 18/024,231
Filed by IDEMITSU KOSAN CO., LTD., Tokyo (JP)
PCT Filed Sep. 2, 2021, PCT No. PCT/JP2021/032216 § 371(c)(1), (2) Date Mar. 1, 2023, PCT Pub. No. WO2022/050330, PCT Pub. Date Mar. 10, 2022.
Claims priority of application No. 2020-147623 (JP), filed on Sep. 2, 2020.
Prior Publication US 2023/0265245 A1, Aug. 24, 2023
Int. Cl. C08G 65/40 (2006.01)

CPC C08G 65/4087 (2013.01)

6 Claims

1. A method for producing an aromatic polyether, comprising reacting 4,4′-dichlorobenzophenone and hydroquinone in the presence of a potassium carbonate satisfying the following conditions (A) and (B):

(A) the potassium carbonate has a bulk density of 1.2 g/ml or less; and

(B) an average particle diameter D (m) and a specific surface area S (m²/g) of the potassium carbonate satisfy D/S≤600, wherein the potassium carbonate is the only alkali metal salt used in the reaction, and a combined concentration of 4,4′-dichlorobenzophenone and hydroquinone in a solvent is 1.5 mol/1 to 4.0 mol/l.