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:
Sep. 06, 2011
Filed:
Jan. 21, 2005
Hisakazu Tanaka, Osaka, JP;
Kazuo Yamamura, Osaka, JP;
Yoshiki Hasegawa, Nishinomiya, JP;
Masayuki Kamei, Osaka, JP;
Hisakazu Tanaka, Osaka, JP;
Kazuo Yamamura, Osaka, JP;
Yoshiki Hasegawa, Nishinomiya, JP;
Masayuki Kamei, Osaka, JP;
Dainippon Ink and Chemicals, Inc., Tokyo, JP;
Abstract
The present invention discloses a production method of core-shell type highly liquid absorbent resin particles comprising: (1) a first step in which a particle core portion is formed by suspension polymerizing an aqueous solution (e) containing (meth)acrylic acid, a crosslinking agent (c) and an anionic surfactant (d) in a hydrophobic organic solvent (a) containing a nonionic surfactant (b), and (2) a second step in which a shell portion that covers the particle core portion is formed by suspension polymerizing an aqueous solution (g) containing a water-soluble vinyl polymer (f), having carboxyl groups and polymerizable unsaturated double bonds and having a number average molecular weight of 500 to 10000, in a suspension obtained in the first step.