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:
Nov. 07, 2023
Filed:
Jun. 20, 2017
Nippon Shokubai Co., Ltd., Osaka, JP;
Ryota Wakabayashi, Himeji, JP;
Mai Sato, Himeji, JP;
Motohiro Imura, Himeji, JP;
Tokio Shuto, Suita, JP;
Yoshihiro Shobo, Himeji, JP;
NIPPON SHOKUBAI CO., LTD., Osaka, JP;
Abstract
[Object] To provide a method for efficiently producing a water-absorbing agent having excellent physical properties. [Solution] The method for producing a water-absorbing agent includes a drying step of drying a particulate crosslinked hydrogel polymer containing a drying aid. The drying aid is (a) a compound having a betaine structure and having a long-chain alkyl group having 8 or more carbon atoms, one quaternary nitrogen, and one acid group within a molecule thereof and/or (b) a compound having a long-chain alkyl group having 8 or more carbon atoms, one tertiary nitrogen, and one or more acid groups within a molecule thereof. An addition amount of the drying aid with respect to a gel solid content of the particulate crosslinked hydrogel polymer is 0.001% by mass to 0.5% by mass. In this production method, surface-crosslinking is performed on water-absorbent resin powder obtained through the drying step.