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:
Aug. 04, 2026
Filed:
Nov. 26, 2020
Nissan Chemical Corporation, Tokyo, JP;
Yuto Hashimoto, Toyama, JP;
Shun Kubodera, Toyama, JP;
Shigetaka Otagiri, Toyama, JP;
Satoshi Kamibayashi, Toyama, JP;
Tokio Nishita, Toyama, JP;
Yuichi Goto, Toyama, JP;
Yasunobu Someya, Toyama, JP;
Yuki Endo, Toyama, JP;
NISSAN CHEMICAL CORPORATION, Tokyo, JP;
Abstract
Provided is a method for producing a polymer, comprising: a first step for synthesizing a crude polymer by reacting a monomer containing a pyrimidinetrione structure, an imidazolidinedione structure, or a triazinetrione structure, in an organic solvent in the presence of a quaternary phosphonium salt or quaternary ammonium salt; and a second step for precipitating and separating a purified polymer by mixing a poor solvent with the crude polymer-containing solution obtained in the first step.