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:
Jun. 02, 2015
Filed:
Jun. 29, 2012
Kazushi Torii, Hyogo, JP;
Reiko Nakatsuru, Hyogo, JP;
Yasuhisa Nakashima, Hyogo, JP;
Katsuyuki Wada, Hyogo, JP;
Kunihiko Ishizaki, Hyogo, JP;
Kazushi Torii, Hyogo, JP;
Reiko Nakatsuru, Hyogo, JP;
Yasuhisa Nakashima, Hyogo, JP;
Katsuyuki Wada, Hyogo, JP;
Kunihiko Ishizaki, Hyogo, JP;
NIPPON SHOKUBAI CO., LTD., Osaka, JP;
Abstract
Provided is a water absorbent resin having excellent liquid permeability, water absorbent speed, anti-impact stability, and weather resistance. Provided is a polyacrylic acid (salt)-based water absorbent resin powder in which the water absorption capacity without load (CRC) is 30 to 45 [g/g], the water absorption capacity under load (AAP 0.3) is 20 to 35 [g/g], the water absorption capacity under load (AAP 0.7) is 10 to 28 [g/g], and the weight average particle diameter (D50) is 300 to 500 μm, characterized by including p-methoxyphenol; having a degradable soluble component (0.05% L-A (saline) for 2 hours/60° C., one hour extraction rinse/room temperature) of 40% by weight or less; and having a internal gas bubbles ratio of 0.1 to 2.5%, as specified by the following equation.(Internal gas bubbles ratio)[%]={(True density)−(Apparent density)}/(True density)×100