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:
Apr. 18, 2017
Filed:
Mar. 17, 2011
Sumio Okuda, Himeji, JP;
Syuji Kanzaki, Himeji, JP;
Kunihiko Ishizaki, Himeji, JP;
Shinichi Fujino, Himeji, JP;
Kozo Nogi, Himeji, JP;
Sumio Okuda, Himeji, JP;
Syuji Kanzaki, Himeji, JP;
Kunihiko Ishizaki, Himeji, JP;
Shinichi Fujino, Himeji, JP;
Kozo Nogi, Himeji, JP;
Nippon Shukubai Co., Ltd., Osaka, JP;
Abstract
A method for producing a water absorbent resin, the method including a polymerization step, a drying step, a classification step, and a surface crosslinking step. The classification step carried out before or after the surface crosslinking step requires use of a tapping material and a metal sieve mesh, in which the tapping material being heated at 40° C. to 100° C. is installed below the metal sieve mesh, and the metal sieve mesh has an area of 1 to 10 m/sheet. The classification step further requires introducing a classification aid particle, which has a specific gravity different from that of the water absorbent resin, to the metal sieve mesh; and monitoring the presence or absence of damage to the metal sieve mesh.