Title:
WATER ABSORBENT RESIN AND WATER STOP MATERIAL
Document Type and Number:
WIPO Patent Application WO/2020/203723
Kind Code:
A1
Abstract:
The present invention provides: a water absorbent resin which exhibits excellent water absorption performance with respect to a salt solution; a water stop material which is provided with this water absorbent resin; and a method for producing a water absorbent resin. A water absorbent resin according to the present invention contains a partially neutralized polyacrylic acid that has a crosslinked structure; and the swelling height of this water absorbent resin with respect to a 3.3 mass% salt solution as determined under the measurement conditions described below is 3.5 mm/0.5 g or more. (Measurement conditions for salt solution swelling height)
Water absorbent resin particles in an amount of 0.5 g are sprayed in a circular concave cap having a height of 30 mm and an inner diameter of 80.5 mm; a nonwoven fabric 4 is spread out thereon; a circular convex cylinder having an outer diameter of 80 mm is put on the nonwoven fabric; and 55 g of a 3.3 mass% salt solution at 20°C is poured into the circular concave cap. After one minute from the time when the water absorbent resin particles started water absorption, the pushed up distance of the circular convex cylinder due to swelling of the water absorbent resin particles is measured as the salt solution swelling height of the water absorbent resin.
Inventors:
YAN XINLEI (JP)
MURAKAMI MASAHIRO (JP)
MURAKAMI MASAHIRO (JP)
Application Number:
PCT/JP2020/013908
Publication Date:
October 08, 2020
Filing Date:
March 27, 2020
Export Citation:
Assignee:
SUMITOMO SEIKA CHEMICALS (JP)
International Classes:
C08F8/14; C08F20/06; C09K3/10; C09K17/22
Domestic Patent References:
| WO2012053121A1 | 2012-04-26 | |||
| WO2013018571A1 | 2013-02-07 | |||
| WO2013125279A1 | 2013-08-29 | |||
| WO2013128978A1 | 2013-09-06 | |||
| WO2004083284A1 | 2004-09-30 | |||
| WO2007126002A1 | 2007-11-08 | |||
| WO2011065368A1 | 2011-06-03 |
Foreign References:
| JP2016035060A | 2016-03-17 |
Attorney, Agent or Firm:
SAEGUSA & PARTNERS (JP)
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