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:
Dec. 25, 2007
Filed:
Jun. 07, 2002
Yasuhisa Nakashima, Himeji, JP;
Hiroyuki Ikeuchi, Himeji, JP;
Yasuhiro Fujita, Himeji, JP;
Makoto Nagasawa, Himeji, JP;
Shigeru Sakamoto, Himeji, JP;
Yorimichi Dairoku, Himeji, JP;
Katsuyuki Wada, Himeji, JP;
Shinichi Fujino, Himeji, JP;
Toshimasa Kitayama, Himeji, JP;
Kazuhisa Hitomi, Himeji, JP;
Yasuhisa Nakashima, Himeji, JP;
Hiroyuki Ikeuchi, Himeji, JP;
Yasuhiro Fujita, Himeji, JP;
Makoto Nagasawa, Himeji, JP;
Shigeru Sakamoto, Himeji, JP;
Yorimichi Dairoku, Himeji, JP;
Katsuyuki Wada, Himeji, JP;
Shinichi Fujino, Himeji, JP;
Toshimasa Kitayama, Himeji, JP;
Kazuhisa Hitomi, Himeji, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
There is provided: a production process for a water-absorbing agent having stable properties in a short time; and a water-absorbing agent. The production process comprises the step of blending an acid-group-containing water-absorbent resin powder with a noncrosslinkable water-soluble inorganic base and/or an irreducible alkaline-metal-salt pH buffer and further with a dehydratable crosslinking agent reactable with the acid group, thereby subjecting the resin powder to crosslinking treatment, or comprises the step of blending an acid-group-containing water-absorbent resin powder with the above base and/or pH buffer and further with a crosslinking agent reactable with the acid group, thereby subjecting the resin powder to crosslinking treatment, wherein the resin powder has a weight-average particle diameter of 300 to 600 μm wherein the ratio of fine powders having particle diameters of not larger than 150 μm in the resin powder is not more than 10 weight %.