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. 10, 2015
Filed:
May. 09, 2012
Kazushi Torii, Hyogo, JP;
Hirofumi Shibata, Hyogo, JP;
Kazuki Kimura, Hyogo, JP;
Yasuhisa Nakashima, Hyogo, JP;
Motohiro Imura, Hyogo, JP;
Hiroko Ueda, Hyogo, JP;
Katsuyuki Wada, Hyogo, JP;
Kazushi Torii, Hyogo, JP;
Hirofumi Shibata, Hyogo, JP;
Kazuki Kimura, Hyogo, JP;
Yasuhisa Nakashima, Hyogo, JP;
Motohiro Imura, Hyogo, JP;
Hiroko Ueda, Hyogo, JP;
Katsuyuki Wada, Hyogo, JP;
NIPPON SHOKUBAI CO., LTD., Osaka, JP;
Abstract
A water absorbing agent of the present invention has an internal crosslinking structure obtained by polymerization of a water-soluble unsaturated monomer. The agent satisfies conditions (a) to (d): (a) the agent contains water-insoluble inorganic particles at an amount of from 10 ppm to 1,900 ppm inclusive; (b) the agent contains 5 mass % or less particles which have such a size that they can pass through a sieve having a mesh opening size of 150 μm; (c) the agent has an absorbency against a pressure of 4.83 kPa (AAP) of 18 g/g or more; and (d) the water-insoluble inorganic particles reside on a surface of the water absorbing resin or near the surface.