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. 06, 2013
Filed:
Aug. 31, 2005
Masazumi Sasabe, Kakogawa, JP;
Kenji Kadonaga, Kakogawa, JP;
Shigeru Sakamoto, Himeji, JP;
Motohiro Imura, Shiki-gun, JP;
Tsunemasa Ueno, Ikeda, JP;
Hiroko Ueda, Himeji, JP;
Yoshifumi Adachi, Himeji, JP;
Masazumi Sasabe, Kakogawa, JP;
Kenji Kadonaga, Kakogawa, JP;
Shigeru Sakamoto, Himeji, JP;
Motohiro Imura, Shiki-gun, JP;
Tsunemasa Ueno, Ikeda, JP;
Hiroko Ueda, Himeji, JP;
Yoshifumi Adachi, Himeji, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
A homogeneously surface cross-linked water absorbent resin and a method for the production thereof are provided. The water absorbent material is formed of a surface cross-linked water absorbent resin resulting from granular irregularly pulverized shaped surface cross-linking the product of partial neutralization or whole neutralization of a water absorbent resin having acrylic acid or a metal salt thereof as a main component, which water absorbent material shows a metal atom concentration on the surface of the water absorbent material in the range of 0-10% within 0 second of polishing and 2-35% at 10 seconds value of polishing as determined by subjecting the water absorbent material to Ar ion discharge polishing under a voltage of 500 Å. The surface cross-linked water absorbent resin to be used herein can be produced by surface cross-linking a water absorbent resin having a specific particle diameter with a surface cross-linking agent having a water concentration in a specific range.