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:
Sep. 27, 2016
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 Shokubai 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 metal sieve mesh having stretch tension from 35 to 100 N/cm, in which an air jet cleaner or an air jet brush cleaner and plural tapping balls or tapping blocks are installed below the metal sieve mesh, a classification aid particle having specific gravity different from that of the water absorbent resin powder is added, and a fine powder of the water absorbent resin and the classification aid particle are removed.