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:
Nov. 17, 2015
Filed:
Feb. 04, 2008
Hiroyuki Ikeuchi, Hyogo, JP;
Hirotama Fujimaru, Hyogo, JP;
Makoto Nagasawa, Nara, JP;
Kazuhiko Sakamoto, Hyogo, JP;
Shigeru Sakamoto, Hyogo, JP;
Kazushi Torii, Hyogo, JP;
Ryoko Tahara, Ibaraki, JP;
Hiroyuki Ikeuchi, Hyogo, JP;
Hirotama Fujimaru, Hyogo, JP;
Makoto Nagasawa, Nara, JP;
Kazuhiko Sakamoto, Hyogo, JP;
Shigeru Sakamoto, Hyogo, JP;
Kazushi Torii, Hyogo, JP;
Ryoko Tahara, Ibaraki, JP;
NIPPON SHOKUBAI CO., LTD., Osaka, JP;
Abstract
An object of the present invention is to provide a particle-shaped water absorbing agent having a remarkably improved surface color and excellent water-absorbing properties (better water absorption capacity, and lower water soluble content and residual monomer content) at the same time. In order to attain the object, a particle-shaped water absorbing agent according to the present invention is a particle-shaped water absorbing agent whose main component is a polyacrylic acid and/or a salt thereof, the particle-shaped water absorbing agent having a surface color of Hunter b value in a range of −5 to 10, and having a cross-linking absorption property index (CPI) in a range of 1 to 100, the CPI defined by the following two equations:=(+17)/Ln (water soluble content);  Equation 1:=(/residual monomer content)×100  Equation 3: