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Patent Searching and Data


Title:
METHOD FOR PRODUCING WATER-ABSORBENT RESIN PARTICLES
Document Type and Number:
WIPO Patent Application WO/2019/221154
Kind Code:
A1
Abstract:
This production method includes a surface crosslinking step which involves performing a heat treatment on a mixture of a surface crosslinking agent and dried polymer particles obtained using an acid group-containing unsaturated monomer as a principal component. The water content of the dried polymer particles is 15 mass% or less. The surface crosslinking step uses a heating device equipped with a rotating vessel and a plurality of heating tubes which are positioned inside the rotating vessel, extend in the axial direction thereof, and rotate along with the rotating vessel. The heating device is equipped with a means for introducing gas into the interior of the rotating vessel and discharging gas therefrom.

Inventors:
WAKABAYASHI RYOTA
FUJINO SHIN-ICHI
SATO MAI
SHOBO YOSHIHIRO
KATSUBE SHIN-YA
ISHIZAKI KUNIHIKO
Application Number:
PCT/JP2019/019225
Publication Date:
November 21, 2019
Filing Date:
May 15, 2019
Export Citation:
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Assignee:
NIPPON CATALYTIC CHEM IND (JP)
International Classes:
C08J3/24; F26B17/32
Domestic Patent References:
WO2014181859A12014-11-13
WO2017221911A12017-12-28
WO2018092863A12018-05-24
WO2015129917A12015-09-03
Foreign References:
JP2015200499A2015-11-12
JP2012012482A2012-01-19
JPS6314076A1988-01-21
JP2004352941A2004-12-16
JP2008038128A2008-02-21
JPS5918864B21984-05-01
US7638570B22009-12-29
US7265190B22007-09-04
JP2017041371W2017-11-16
JP2017041372W2017-11-16
Other References:
See also references of EP 3795616A4
Attorney, Agent or Firm:
PATENT CORPORATE BODY ARCO PATENT OFFICE (JP)
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