Title:
ポリアクリル酸（塩）系吸水性樹脂粉末の製造方法及びポリアクリル酸（塩）系吸水性樹脂粉末
Document Type and Number:
Japanese Patent JP5676572
Kind Code:
B2
Abstract:
An object of the present invention is to provide a method for producing water absorbent resin powder in which permeability potential (SFC) is improved while a water absorbing rate (FSR) is being kept. The method is a method for producing water absorbent polyacrylic acid (salt) resin powder including the steps of: (i) polymerizing an acrylic acid (salt) monomer aqueous solution; (ii) during or after the step of (i), performing gel grinding of a hydrogel crosslinked polymer obtained by the polymerization, wherein the hydrogel crosslinked polymer has resin solid content of 10 wt% to 80 wt%, and the gel grinding is carried as to obtain a particulate hydrogel crosslinked polymer having a weight average particle diameter (D50) of 350 pm to 2000 pm and logarithmic standard deviation (ö) of particle size distribution of 0.2 to 1.0; (iii) drying a particulate hydrogel crosslinked polymer obtained by the gel grinding, wherein the drying is performed at 150°C to 250°C; and (iv) carrying out a surface treatment to the particulate hydrogel crosslinked polymer thus dried.
Inventors:
町田 さやか
鳥井 一司
白井 洋子
池内 博之
阪本 繁
舘 幸次
中津留 玲子
鳥井 一司
白井 洋子
池内 博之
阪本 繁
舘 幸次
中津留 玲子
Application Number:
JP2012509701A
Publication Date:
February 25, 2015
Filing Date:
April 07, 2011
Export Citation:
Assignee:
株式会社日本触媒
International Classes:
C08F6/00; B29C48/345; B29C48/395; B29C48/92; C08J3/12; B29C48/04; B29C48/05
Domestic Patent References:
| JPH11349687A | 1999-12-21 | |||
| JP2004522491A | 2004-07-29 | |||
| JPH10168129A | 1998-06-23 | |||
| JP2010505003A | 2010-02-18 | |||
| JP2000143722A | 2000-05-26 | |||
| JPH11349687A | 1999-12-21 | |||
| JP2004522491A | 2004-07-29 | |||
| JPH10168129A | 1998-06-23 | |||
| JP2007529295A | 2007-10-25 | |||
| JP2002527547A | 2002-08-27 | |||
| JPH0570597A | 1993-03-23 | |||
| JPS6426604A | 1989-01-27 |
Foreign References:
| WO2011078298A1 | 2011-06-30 | |||
| WO2010095427A1 | 2010-08-26 | |||
| WO2011078298A1 | 2011-06-30 | |||
| WO2010095427A1 | 2010-08-26 |
Attorney, Agent or Firm:
Patent business corporation HARAKENZO WORLD PATENT & TRADEMARK