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:
Dec. 31, 2019
Filed:
Jan. 23, 2015
Nissan Chemical Corporation, Tokyo, JP;
Misayo Otani, Funabashi, JP;
Koichiro Saruhashi, Funabashi, JP;
Taito Nishino, Shiraoka, JP;
Ayako Aihara, Shiraoka, JP;
Hisashi Ishii, Saitama, JP;
Keigo Matsumoto, Funabashi, JP;
NISSAN CHEMICAL CORPORATION, Tokyo, JP;
Abstract
The present invention provides a production method of a medium composition, including previously removing divalent metal cations contained in a polymer compound having an anionic functional group, preparing a dry powder of the polymer compound, and mixing the dry powder and the medium, and the like. The present invention also provides a purification method of a polymer compound having an anionic functional group, which includes mixing a suspension of the polymer compound having an anionic functional group in water and a cation exchanger that exchanges a divalent metal cation with a monovalent metal cation to give a polymer compound having an anionic functional group, which shows a reduced amount of contaminating divalent metal cations.