Invention Grant
- Patent Title: Method for producing water-absorbent resin particles
- Patent Title (中): 吸水性树脂颗粒的制造方法
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Application No.: US14372161Application Date: 2013-01-22
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Publication No.: US09138722B2Publication Date: 2015-09-22
- Inventor: Kenji Tanimura , Hiroki Yabuguchi , Yuichi Onoda , Masayoshi Handa
- Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.
- Applicant Address: JP Hyogo
- Assignee: Sumitomo Seika Chemicals Co., Ltd.
- Current Assignee: Sumitomo Seika Chemicals Co., Ltd.
- Current Assignee Address: JP Hyogo
- Agency: Hamre, Schumann, Mueller & Larson, P.C.
- Priority: JP2012-043571 20120229
- International Application: PCT/JP2013/051207 WO 20130122
- International Announcement: WO2013/128978 WO 20130906
- Main IPC: B01J20/30
- IPC: B01J20/30 ; C08F2/32 ; C08F20/06 ; C08F120/06 ; A61L15/12 ; B01J20/26 ; C08L33/02

Abstract:
There is disclosed a method for producing water-absorbent resin particles comprising a step that includes reversed-phase suspension polymerization of a water-soluble ethylenically unsaturated monomer in a suspension containing a surfactant that comprises a surfactant that comprises a fatty acid ester of sorbitan or sorbitol, or derivative thereof, and a hydrocarbon dispersion medium. The fatty acid ester includes a lauric acid ester and at least one kind of other ester selected from the group consisting of palmitic acid esters, stearic acid esters and behenic acid esters. The proportion of the peak area for lauric acid ester is 30-60%, based on the total peak area for fatty acid esters in the GPC chromatogram obtained from the fatty acid esters, and the proportion of the total peak area for other ester is 10-50%.
Public/Granted literature
- US20150158015A1 METHOD FOR PRODUCING WATER-ABSORBENT RESIN PARTICLES Public/Granted day:2015-06-11
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