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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 11020726 B1

PDFFull Text
Date of Patent:
Jun. 01, 2021

Filed:

Dec. 04, 2019

Super absorbent polyacrylic acid (salt)-based resin powder, method for manufacturing same, and method for evaluating same

Applicant:

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

Inventors:

Kenji Tada, Hyogo, JP;

Kazushi Torii, Hyogo, JP;

Assignee:

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

Attorney:

Harness Dickey & Pierce P.L.C.

Primary Examiner:

Angela C Scott

Int. Cl.
CPC ...
B01J 20/26 (2006.01); C08L 33/02 (2006.01); C08K 3/00 (2018.01); C08J 3/12 (2006.01); B01J 20/04 (2006.01); B01J 20/10 (2006.01); B01J 20/28 (2006.01); B01J 20/30 (2006.01); C08F 20/04 (2006.01); C08J 3/24 (2006.01); G01N 15/02 (2006.01); C08J 3/075 (2006.01);
U.S. Cl.
CPC ...
B01J 20/267 (2013.01); B01J 20/043 (2013.01); B01J 20/103 (2013.01); B01J 20/28016 (2013.01); B01J 20/28047 (2013.01); B01J 20/3021 (2013.01); B01J 20/3085 (2013.01); C08F 20/04 (2013.01); C08J 3/12 (2013.01); C08J 3/245 (2013.01); C08K 3/00 (2013.01); C08L 33/02 (2013.01); G01N 15/0255 (2013.01); C08F 2810/20 (2013.01); C08J 3/075 (2013.01); C08J 2331/02 (2013.01);
Abstract

The present invention provides polyacrylic acid (salt)-based water-absorbing resin powder having an excellent fluid retention capacity under pressure, an excellent water absorption speed, and an excellent liquid permeability and a method for producing the polyacrylic acid (salt)-based water-absorbing resin powder. The earlier-described objects are attained by: a method for producing water-absorbing resin powder which includes adding an inorganic compound to a crosslinked hydrogel polymer obtained in a polymerization step of polymerizing a polyacrylic acid (salt) and performing crushing in specific gel-crushing conditions; and the resultant water-absorbing resin powder.

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