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:
Jan. 16, 2018
Filed:
Apr. 24, 2015
Applicant:
Nippon Shokubai Co., Ltd., Osaka-shi, Osaka, JP;
Inventors:
Assignee:
NIPPON SHOKUBAI CO., LTD., Osaka-shi, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F 120/06 (2006.01); C08F 20/06 (2006.01); C08F 2/01 (2006.01); C08F 2/10 (2006.01); B01J 20/26 (2006.01); B01J 20/30 (2006.01);
U.S. Cl.
CPC ...
C08F 120/06 (2013.01); B01J 20/261 (2013.01); B01J 20/265 (2013.01); B01J 20/267 (2013.01); B01J 20/3014 (2013.01); C08F 2/01 (2013.01); C08F 2/10 (2013.01); C08F 20/06 (2013.01);
Abstract
A method for producing polyacrylic acid (salt)-based water-absorbing resin includes a step of polymerizing an acrylic acid (salt)-based aqueous monomer solution, the polymerization step involving use of a polymerization reaction apparatus including a polymerization reaction unit covered with a casing, the polymerization step involving a polymerization reaction under internal pressure of the polymerization reaction unit, the internal pressure being slightly reduced and having a pressure reduction level of more than 0 kPa and not more than 10 kPa relative to the ambient pressure at the periphery of the polymerization reaction unit.