Title:
ポリアクリル酸（塩）系吸水性樹脂粉末の製造方法
Document Type and Number:
Japanese Patent JP5722921
Kind Code:
B2
Abstract:
From a view point of reduction in an out of spec product after surface crosslinking, particularly, when an alkylene carbonate compound is used as a surface crosslinking agent, influence by an air temperature is great, and it is necessary to reduce ethylene glycol which is produced as a byproduct, and there is provided a process for producing a polyacrylic acid (salt)-based water absorbent resin powder, comprising
a step of polymerizing an aqueous acrylic acid (salt)-based monomer solution,
a step of drying the resulting polymer,
an optional grinding·classifying step, and
a surface crosslinking step,
wherein in the surface crosslinking step,
(1) a surface crosslinking agent containing an alkylene carbonate compound and a polyhydric alcohol compound is mixed into a water absorbent resin powder, the mixture is heat-reacted and, further, simultaneously with, or separately from the mixing, an ion reactive surface crosslinking agent is mixed, and/or
(2) mixing treatment of mixing a surface crosslinking agent solution into a water absorbent resin powder containing at least one or more kinds of ion reactive surface crosslinking agents is performed two or more times.
Inventors:
NOGI KOZO (JP)
NAKAMURA MASATOSHI (JP)
SHIBATA KOJI (JP)
HONDA KOJI (JP)
WATANABE YUSUKE (JP)
MATSUMOTO SATOSHI (JP)
NAKATSURU REIKO (JP)
ISHIZAKI KUNIHIKO (JP)
KIMURA KAZUKI (JP)
MACHIDA SAYAKA (JP)
NAKAMURA MASATOSHI (JP)
SHIBATA KOJI (JP)
HONDA KOJI (JP)
WATANABE YUSUKE (JP)
MATSUMOTO SATOSHI (JP)
NAKATSURU REIKO (JP)
ISHIZAKI KUNIHIKO (JP)
KIMURA KAZUKI (JP)
MACHIDA SAYAKA (JP)
Application Number:
JP2012554880A
Publication Date:
May 27, 2015
Filing Date:
January 30, 2012
Export Citation:
Assignee:
NIPPON CATALYTIC CHEM IND (JP)
International Classes:
C08J3/24; C08F20/06; C08J3/12
Domestic Patent References:
| JP2010516882A | 2010-05-20 | |||
| JP2004509196A | 2004-03-25 | |||
| JP2002538275A | 2002-11-12 | |||
| JP2003529647A | 2003-10-07 | |||
| JPH09502221A | 1997-03-04 | |||
| JP2007523254A | 2007-08-16 | |||
| JP2010520948A | 2010-06-17 | |||
| JP2006116535A | 2006-05-11 | |||
| JPH10168129A | 1998-06-23 | |||
| JP2009531467A | 2009-09-03 | |||
| JP2010516882A | 2010-05-20 | |||
| JP2004509196A | 2004-03-25 | |||
| JP2002538275A | 2002-11-12 | |||
| JP2003529647A | 2003-10-07 | |||
| JPH09502221A | 1997-03-04 |
Foreign References:
| CH283612A | 1952-06-15 | |||
| FR1392029A | 1965-03-12 | |||
| FR2166276A1 | 1973-08-17 | |||
| GB533718A | 1941-02-19 | |||
| US2151733A | 1939-03-28 |
Attorney, Agent or Firm:
Hatta International Patent Corporation