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:
Feb. 11, 2014
Filed:
Feb. 08, 2010
Shinichi Fujino, Himeji, JP;
Eri Nagasawa, Himeji, JP;
Satoshi Matsumoto, Himeji, JP;
Kunihiko Ishizaki, Himeji, JP;
Shinichi Fujino, Himeji, JP;
Eri Nagasawa, Himeji, JP;
Satoshi Matsumoto, Himeji, JP;
Kunihiko Ishizaki, Himeji, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
The purpose of the present invention is to improve the water absorption of a water-absorbent resin without sacrificing the productivity, production cost, safety, and so on. Provided is a sustainable and renewable water-absorbent resin with excellent whiteness, which is suitable for mass consumption as disposal diapers or the like, and which can dispense with excessive purification of raw material acrylic acid. Also provided is a process for the production of a water-absorbent resin, which comprises: a step of preparing acrylic monomers; a step of polymerizing the monomers; and a step of drying the obtained aqueous gel, wherein the monomers at the time of polymerization contain at least 400 ppm of propionic acid.