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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 11084889 B1

PDFFull Text
Date of Patent:
Aug. 10, 2021

Filed:

Sep. 30, 2016

Water-absorbent resin particles and method for producing same

Applicant:

Sdp Global Co., Ltd., Tokyo, JP;

Inventors:

Yusuke Matsubara, Tokyo, JP;

Toru Miyajima, Tokyo, JP;

Assignee:

SDP Global Co., Ltd., Tokyo, JP;

Attorneys:

Locke Lord LLP

James E. Armstrong, IV

Nicholas J. DiCeglie, Jr.

Primary Examiner:

Liam J Heincer

Int. Cl.
CPC ...
C08F 2/44 (2006.01); C08F 220/06 (2006.01); C08F 4/40 (2006.01); C08J 3/12 (2006.01); A61L 15/26 (2006.01); A61F 13/53 (2006.01); A61L 15/60 (2006.01); B01J 31/12 (2006.01); C08F 220/56 (2006.01); C08K 5/56 (2006.01); C08K 5/59 (2006.01);
U.S. Cl.
CPC ...
C08F 2/44 (2013.01); A61F 13/53 (2013.01); A61L 15/26 (2013.01); A61L 15/60 (2013.01); B01J 31/122 (2013.01); C08F 4/40 (2013.01); C08F 220/06 (2013.01); C08F 220/56 (2013.01); C08J 3/12 (2013.01); C08K 5/56 (2013.01); C08K 5/59 (2013.01); A61F 2013/530481 (2013.01); B01J 2531/52 (2013.01); B01J 2531/54 (2013.01); B01J 2531/60 (2013.01);
Abstract

Provided is a method for producing water-absorbent resin particles, which is capable of improving the gel strength for the purpose of achieving a good balance between the absorption under load and the rate of liquid permeation through gel. The present invention is a method for producing water-absorbent resin particles, which is characterized by comprising a step wherein a monomer composition containing a water-soluble vinyl monomer (a1) and/or a vinyl monomer (a2) that turns into a water-soluble vinyl monomer (a1) by means of hydrolysis and a crosslinking agent (b) is polymerized in the presence of at least one organic main group element compound selected from the group consisting of organic iodine compounds, organic tellurium compounds, organic antimony compounds, and organic bismuth compounds.

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