Title:
POLYACRYLIC ACID (SALT) WATER-ABSORBING RESIN AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2013/122246
Kind Code:
A1
Abstract:
Provided is a method for manufacturing a water-absorbing resin that has excellent water-absorption performance and is made from an acrylic acid that is suitable for large-scale production of said water-absorbing resin. Said method for manufacturing a polyacrylic acid (salt) water-absorbing resin includes a prescribed monomer-preparation step, polymerization step, drying step, and surface-crosslinking step, in that order. The acetic-acid concentration of the acrylic acid and the like supplied to the monomer-preparation step is 300 to 10,000 ppm (with respect to the acrylic acid), and an acetic-acid-concentration decrease percentage defined by a given formula is at least 35%.
Inventors:
MATSUMOTO SATOSHI (JP)
MIYAMOTO TAKASHI (JP)
SAKAI TOYOFUMI (JP)
ISHII YOSHITAKE (JP)
ISHIZAKI KUNIHIKO (JP)
MIYAMOTO TAKASHI (JP)
SAKAI TOYOFUMI (JP)
ISHII YOSHITAKE (JP)
ISHIZAKI KUNIHIKO (JP)
Application Number:
PCT/JP2013/053823
Publication Date:
August 22, 2013
Filing Date:
February 18, 2013
Export Citation:
Assignee:
NIPPON CATALYTIC CHEM IND (JP)
International Classes:
C08J3/24; C08F6/00; C08F20/06; C08J3/12
Domestic Patent References:
| WO2010090324A1 | 2010-08-12 |
Foreign References:
| JP2008535640A | 2008-09-04 | |||
| JP2006116535A | 2006-05-11 | |||
| JP2012031292A | 2012-02-16 | |||
| JP2011231188A | 2011-11-17 |
Attorney, Agent or Firm:
HARAKENZO WORLD PATENT & TRADEMARK (JP)
Patent business corporation Hara [Kenzo] international patent firm (JP)
Patent business corporation Hara [Kenzo] international patent firm (JP)
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Claims: