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Title:
METHOD FOR PRODUCING WATER-ABSORBING RESIN PARTICLES
Document Type and Number:
WIPO Patent Application WO/2022/025122
Kind Code:
A1
Abstract:
The present invention discloses a method for producing water-absorbing resin particles containing polymer particles. This method includes: a step for forming a hydrous gel-like polymer through a polymerization reaction in a reaction solution; and a step for forming a powder of polymer particles by pulverizing a dried product containing the polymer. When five measurement points are arranged in series on a straight line perpendicular to an extension direction X of a side wall surface, among the highest temperatures at which the temperature of the reaction solution reaches during the polymerization reaction, measured respectively at the five measurement points, at a point of time when the maximum value Tmax is indicated at any one of the five measurement points, the standard deviation of the temperatures of the reaction solution, measured respectively at the five measurement points, is 12-30, and Tmax is 80-100°C.

Inventors:
OKAZAWA SHIHO (JP)
Application Number:
PCT/JP2021/027923
Publication Date:
February 03, 2022
Filing Date:
July 28, 2021
Export Citation:
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Assignee:
SUMITOMO SEIKA CHEMICALS (JP)
International Classes:
C08J3/12; C08F2/01; C08F220/06
Domestic Patent References:
WO2011136301A12011-11-03
WO2008126793A12008-10-23
Foreign References:
JP2016112474A2016-06-23
JP2014098172A2014-05-29
JP2007284675A2007-11-01
JPH11302306A1999-11-02
JP2008535963A2008-09-04
JP2006143836A2006-06-08
JP2007528912A2007-10-18
JPH11228604A1999-08-24
JPH1045812A1998-02-17
JPH08165303A1996-06-25
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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