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:
Aug. 20, 2013
Filed:
Sep. 16, 2010
Sayaka Machida, Himeji, JP;
Kazushi Torii, Himeji, JP;
Yoko Shirai, Himeji, JP;
Hiroyuki Ikeuchi, Himeji, JP;
Kunihiko Ishizaki, Himeji, JP;
Sayaka Machida, Himeji, JP;
Kazushi Torii, Himeji, JP;
Yoko Shirai, Himeji, JP;
Hiroyuki Ikeuchi, Himeji, JP;
Kunihiko Ishizaki, Himeji, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
The present invention provides a method for producing a water-absorbing resin powder. The method includes a polymerization step, a drying step, a pulverization step, a classification step, and a surface cross-linking step. It further includes an additional step, performed before the surface cross-linking step, in which at least part of the classified polymer is supplied again to the same or a different pulverization step. The circulation pulverization ratio in the pulverization step is higher than 1.50.