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. 01, 2009
Filed:
Apr. 04, 2008
Yorimichi Dairoku, Himeji, JP;
Yoshifumi Adachi, Himeji, JP;
Kozo Nogi, Kakogawa, JP;
Hiroki Inoue, Kyoto, JP;
Katsuyuki Wada, Himeji, JP;
Yoshio Irie, Himeji, JP;
Yorimichi Dairoku, Himeji, JP;
Yoshifumi Adachi, Himeji, JP;
Kozo Nogi, Kakogawa, JP;
Hiroki Inoue, Kyoto, JP;
Katsuyuki Wada, Himeji, JP;
Yoshio Irie, Himeji, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
A particulate water absorbing agent of the present invention includes a water absorbent resin, having a cross-linking structure, whose surface has been cross-linked by adding a surface treatment agent, wherein: (i) a mass average particle diameter (D50) ranges from 200 to 600 μm and 95 to 100 wt % of a particulate water absorbing agent whose particle diameter ranges from less than 850 μm to not less than 150 μm is contained with respect to 100 wt % of whole the particulate water absorbing agent, and (ii) a logarithmic standard deviation (σζ) of particle size distribution ranges from 0.25 to 0.45, and (iii) a compressibility rate defined by a following equation ranges from 0 to 18%, and (iv) a surface tension of a supernatant liquid obtained in 4 minutes after dispersing 0.5 g of the particulate water absorbing agent in 50 ml of physiological saline whose temperature is 20° C. is 55 mN/m or more,the compressibility rate (%)=()/