发明名称 |
WATER-ABSORBING RESIN MANUFACTURING METHOD |
摘要 |
<p>A method for producing a water-absorbent resin by a reversed-phase suspension polymerization method, includes step 1 of dispersing a first aqueous solution containing a partially neutralized product (A) of a water-soluble ethylenically unsaturated monomer having acid groups in the molecule in a petroleum-type hydrocarbon dispersion medium in the presence of a dispersing agent, and then polymerizing the resulting dispersion to obtain a slurry containing primary particles of a polymer, and step 2 of adding a second aqueous solution containing a partially neutralized product (B) of a water-soluble ethylenically unsaturated monomer having acid groups in the molecule to the slurry obtained in step 1, and then polymerizing the mixture to obtain a slurry in which the primary particles are agglomerated. In the method, a molar neutralization degree X of the partially neutralized product (A) is set larger than a molar neutralization degree Y of the partially neutralized product (B), and also a difference between the molar neutralization degree X and the molar neutralization degree Y is set to 5% or more. The dispersing agent usable herein is at least one member among those of a surfactant and a polymer-type dispersing agent. The water-absorbent resin produced by this method suppresses odor originating from a dispersion medium and odor generated with the lapse of time after absorption of a body fluid or the like.</p> |
申请公布号 |
EP2674441(A4) |
申请公布日期 |
2014.07.30 |
申请号 |
EP20120744982 |
申请日期 |
2012.01.23 |
申请人 |
SUMITOMO SEIKA CHEMICALS CO., LTD. |
发明人 |
HANDA, MASAYOSHI;UEDA, KOJI;KONDO, KIMIHIKO |
分类号 |
C08F2/32;C08F2/00 |
主分类号 |
C08F2/32 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|