The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 03, 2025
Filed:
Sep. 02, 2021
Applicant:
Idemitsu Kosan Co., Ltd., Tokyo, JP;
Inventors:
Koichi Suga, Sodegaura, JP;
Minoru Senga, Sodegaura, JP;
Hiromu Kumagai, Sodegaura, JP;
Yuko Murakami, Ichihara, JP;
Assignee:
IDEMITSU KOSAN CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 65/40 (2006.01);
U.S. Cl.
CPC ...
C08G 65/4087 (2013.01);
Abstract
Provided is a method for producing an aromatic polyether, comprising reacting 4,4'-dichlorobenzophenone and hydroquinone in the presence of a potassium carbonate satisfying at least one of 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 (μm) and a specific surface area S (m/g) of the potassium carbonate satisfy D/S≤600.