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Title:
METHOD FOR PRODUCING POLYACRYLIC ACID (SALT)-BASED WATER-ABSORBING RESIN
Document Type and Number:
WIPO Patent Application WO/2014/084281
Kind Code:
A1
Abstract:
　Provided is a simple method for improving and stabilizing the physical properties (e.g. liquid permeability) of a water-absorbing resin, without requiring investment in expensive facilities or modification of raw materials. In particular, provided is a method which is useful in the large-scale production of water-absorbing resin. This method of producing polyacrylic acid (salt) based resin contains, in sequence, a step in which an acrylic acid (salt)-based monomer aqueous solution is polymerized, a step in which the water-containing gel-type cross-linked polymer obtained in the polymerization step is dried, a step in which the dry polymer obtained in the drying step is crushed, and a grading step which takes place after the drying step or after the crushing step. The method is characterized in that when providing the dry polymer to the rolling mill used in the crushing step, the dry polymer is provided in a distributed state in the axial direction of the roller of the rolling mill.

Inventors:
MATSUMOTO SATOSHI (JP)
MATSUMOTO MAKOTO (JP)
KATO SEIJI (JP)
KONISHI KAZUMASA (JP)
KADONAGA KENJI (JP)
FUJINO SHINICHI (JP)
Application Number:
PCT/JP2013/081968
Publication Date:
June 05, 2014
Filing Date:
November 27, 2013
Export Citation:
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Assignee:
NIPPON CATALYTIC CHEM IND (JP)
International Classes:
C08J3/12
Domestic Patent References:
WO2011034146A12011-03-24
WO2010114058A12010-10-07
WO2012152647A12012-11-15
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See also references of EP 2927264A4
Attorney, Agent or Firm:
HATTA & ASSOCIATES (JP)
Hatta international patent business corporation (JP)
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