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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.:

US 11465126 B1

PDFFull Text
Date of Patent:
Oct. 11, 2022

Filed:

Nov. 16, 2017

Method for producing water-absorbent resin powder and production apparatus therefor

Applicant:

Nippon Shokubai Co., Ltd., Osaka, JP;

Inventors:

Hiroyasu Watabe, Himeji, JP;

Mai Sato, Himeji, JP;

Ryota Wakabayashi, Himeji, JP;

Yoshihiro Shobo, Himeji, JP;

Shin-ya Katsube, Himeji, JP;

Motohiro Imura, Himeji, JP;

Koji Honda, Himeji, JP;

Yoshifumi Adachi, Himeji, JP;

Tsuyoshi Yorino, Himeji, JP;

Masafumi Inoue, Himeji, JP;

Tomoyuki Arake, Himeji, JP;

Hiroki Hayashi, Himeji, JP;

Naoki Katakura, Himeji, JP;

Shin-ichi Fujino, Himeji, JP;

Kunihiko Ishizaki, Himeji, JP;

Tokio Shuto, Suita, JP;

Assignee:

NIPPON SHOKUBAI CO., LTD., Osaka, JP;

Attorney:

Dickinson Wright PLLC

Primary Examiner:

Edward M Johnson

Int. Cl.
CPC ...
B01J 20/26 (2006.01); B01J 13/00 (2006.01); B01J 20/28 (2006.01); B01J 20/30 (2006.01); C08F 220/06 (2006.01); F26B 3/10 (2006.01); F26B 17/10 (2006.01); F26B 1/00 (2006.01); F26B 17/00 (2006.01); B01J 2/12 (2006.01);
U.S. Cl.
CPC ...
B01J 20/267 (2013.01); B01J 13/0065 (2013.01); B01J 13/0069 (2013.01); B01J 20/28004 (2013.01); B01J 20/28016 (2013.01); B01J 20/3021 (2013.01); B01J 20/3078 (2013.01); B01J 20/3085 (2013.01); C08F 220/06 (2013.01); F26B 1/005 (2013.01); F26B 3/10 (2013.01); F26B 17/00 (2013.01); F26B 17/106 (2013.01); B01J 2/12 (2013.01); C08F 2800/20 (2013.01); C08F 2810/20 (2013.01);
Abstract

The production method includes: a gel-crushing step of grinding a crosslinked hydrogel polymer to obtain a particulate crosslinked hydrogel polymer; a heating drying step of obtaining dried particles from the particulate crosslinked hydrogel polymer by using a continuous stirring drying machine; a post-crosslinking step of post-crosslinking the particulate crosslinked hydrogel polymer or the dried particles; and a sizing step of adjusting a particle size of the dried particles or the post-crosslinked dried particles to obtain water-absorbent resin powder. The particulate crosslinked hydrogel polymer contains a gel fluidizer. A gel temperature of the particulate crosslinked hydrogel polymer containing the gel fluidizer, the gel temperature being measured by a contact thermometer, is not lower than 50° C. In the production method, the dried particles or the post-crosslinked dried particles is forcedly cooled before the sizing step.

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