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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 11224857 B1

PDFFull Text
Date of Patent:
Jan. 18, 2022

Filed:

Mar. 28, 2017

Method for manufacturing water absorbing agent

Applicant:

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

Inventors:

Mariko Tamaki, Himeji, JP;

Kazushi Torii, Himeji, JP;

Hiroyuki Ikeuchi, Himeji, JP;

Assignee:

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

Attorney:

Dickinson Wright PLLC

Primary Examiner:

Edward M Johnson

Int. Cl.
CPC ...
B01J 20/30 (2006.01); A61L 15/20 (2006.01); A61L 15/24 (2006.01); A61L 15/60 (2006.01); B01J 20/26 (2006.01); C08L 33/02 (2006.01); A61F 13/53 (2006.01); C08F 2/44 (2006.01); C08K 5/098 (2006.01); B01J 20/28 (2006.01); C08F 122/20 (2006.01);
U.S. Cl.
CPC ...
B01J 20/3085 (2013.01); A61F 13/53 (2013.01); A61L 15/20 (2013.01); A61L 15/24 (2013.01); A61L 15/60 (2013.01); B01J 20/26 (2013.01); B01J 20/265 (2013.01); B01J 20/28 (2013.01); B01J 20/30 (2013.01); C08F 2/44 (2013.01); C08F 122/20 (2013.01); C08K 5/098 (2013.01); C08L 33/02 (2013.01);
Abstract

A water absorbent agent having a high water absorption multiplying factor where stickiness after absorbing liquid can be reduced when used as a hygienic material is produce by a method for manufacturing the water absorbing agent. The method for manufacturing a water absorbent agent having a centrifuge retention capacity (CRC) of 30 g/g or greater, includes subjecting an aqueous solution of a monomer that includes an acrylic acid (salt) to a polymerization step, a drying step, and a surface cross-linking step, and a step for adding α-hydroxycarboxylic acid (salt) before the drying step. The atomic weight of the soluble portion eluted when the water absorbent agent absorbs liquid and swells can be reduced by the α-hydroxycarboxylic acid (salt) before the drying step to reduce the stickiness of the water absorbent agent after absorption of liquid, which leads to discomfort during use of disposable diapers and the like.

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