发明名称 PROCESS FOR PRODUCTION OF WATER-ABSORBABLE RESIN PARTICLE, AND WATER-ABSORBABLE RESIN PARTICLE PRODUCED BY THE PROCESS
摘要 <p>Disclosed is a process for production of a water-absorbable resin particle, which comprises the following steps (1) to (3): (1) performing the first stage of the reverse phase suspension polymerization of a water-soluble ethylenically unsaturated monomer in a petroleum hydrocarbon solvent in the presence of a dispersion stabilizer to yield a spherical primary particle having a median particle diameter (d) of 30 to 130 µm; (2) cooling the polymerization reaction solution to cause the precipitation of the dispersion stabilizer; and (3) adding a second-stage water-soluble ethylenically unsaturated monomer to the polymerization reaction solution and performing the second stage of the reverse phase suspension polymerization to cause the aggregation of the primary particle, thereby forming a secondary particle having a median particle diameter (D) of 200 to 500 µm, wherein the median particle diameter (d) of the primary particle and the median particle diameter (D) of the secondary particle has the relationship shown by the following formula: 5d/3+150 < D < 5d+150.</p>
申请公布号 WO2007123188(A1) 申请公布日期 2007.11.01
申请号 WO2007JP58579 申请日期 2007.04.20
申请人 SUMITOMO SEIKA CHEMICALS CO., LTD.;HANDA, MASAYOSHI;NAWATA, YASUHIRO 发明人 HANDA, MASAYOSHI;NAWATA, YASUHIRO
分类号 C08F2/18;B01J20/26;C08F20/06 主分类号 C08F2/18
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