Title:
PROCESS FOR PRODUCING POLYACRYLIC ACID (SALT)-BASED WATER-ABSORBING RESIN
Document Type and Number:
WIPO Patent Application WO/2014/021432
Kind Code:
A1
Abstract:
Provided is a process whereby a polyacrylic acid (salt)-based water-absorbing resin having improved or intact material properties (in particular, liquid permeability) can be produced even on a large scale.
The process for producing a polyacrylic acid (salt)-based water-absorbing resin comprises in the following order: a polymerization step in which an aqueous monomer solution containing acrylic acid (salt) as the main component is polymerized; a drying step in which the crosslinked polymer in a hydrous gel form obtained in the polymerization step is dried; and a classification step in which the polymer obtained in the drying step is classified. In the classification step, use is made of a shaking sifter in which the trajectory and the number of revolutions of the screen of the shaking sifter are within the following ranges.
Radial inclination R: 5-40 mm
Tangential inclination T: 0.1-25 mm
Eccentric inclination E: 40-80 mm
Number of revolutions F: 60-600 rpm
Inventors:
MATSUMOTO MAKOTO (JP)
KATO SEIJI (JP)
FUJINO SHINICHI (JP)
NABARA NOBORU (JP)
OTANI RYUICHI (JP)
KAWAGUCHI YASUHIRO (JP)
OKUGAWA NARIMASA (JP)
ICHIKAWA KENTARO (JP)
ETO MAKOTO (JP)
KATO SEIJI (JP)
FUJINO SHINICHI (JP)
NABARA NOBORU (JP)
OTANI RYUICHI (JP)
KAWAGUCHI YASUHIRO (JP)
OKUGAWA NARIMASA (JP)
ICHIKAWA KENTARO (JP)
ETO MAKOTO (JP)
Application Number:
PCT/JP2013/070916
Publication Date:
February 06, 2014
Filing Date:
August 01, 2013
Export Citation:
Assignee:
NIPPON CATALYTIC CHEM IND (JP)
International Classes:
C08J3/12; B07B1/00; B07B1/28; B07B1/46; B07B1/50; C08F220/06
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Attorney, Agent or Firm:
HATTA & ASSOCIATES (JP)
Hatta international patent business corporation (JP)
Hatta international patent business corporation (JP)
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