发明名称 |
Process for production of water-absorbing resin particles, water-absorbing resin particles, water-stopping material, and absorbent article |
摘要 |
The present invention provides a method for producing water-absorbing resin particles having high equilibrium swelling capacity, a high water-absorption rate or high initial swelling capacity, and an appropriate particle size that achieves good handling performance; water-absorbing resin particles obtained by the method; and a water blocking material and an absorbent article which include the water-absorbing resin particles. The present invention is a method for producing water-absorbing resin particles, which comprises: preparing a hydrogel polymer by reversed-phase suspension polymerization of a water-soluble ethylenically unsaturated monomer in a hydrocarbon solvent in the absence of an internal crosslinking agent but in the presence of a surfactant with an HLB of 8 to 12; carrying out a post-crosslinking reaction of the hydrogel polymer whose moisture content is adjusted to 30 to 110 mass % based on a water-soluble ethylenically unsaturated monomer component that composes the hydrogel polymer. |
申请公布号 |
US9320660(B2) |
申请公布日期 |
2016.04.26 |
申请号 |
US201013510522 |
申请日期 |
2010.11.24 |
申请人 |
Sumitomo Seika Chemicals Co., Ltd. |
发明人 |
Kikuno Sachi;Heguri Atsushi;Handa Masayoshi;Maeda Nobuhiro |
分类号 |
C08K5/10;C08F2/44;A61F13/53;A61F13/15;C08J3/24;C08F2/32;C08F6/00 |
主分类号 |
C08K5/10 |
代理机构 |
Hamre, Schumann, Mueller & Larson, P.C. |
代理人 |
Hamre, Schumann, Mueller & Larson, P.C. |
主权项 |
1. A method for producing water-absorbing resin particles, which comprises:
preparing a hydrogel polymer by reversed-phase suspension polymerization of a water-soluble ethylenically unsaturated monomer in a hydrocarbon solvent in the absence of an internal crosslinking agent but in the presence of a surfactant having an HLB in a range from 8 to 12; and carrying out a post-crosslinking reaction of the hydrogel polymer, whose moisture content has been adjusted so as to form a first-dried gel, to in a range from 30 to 110 mass % relative to a water-soluble ethylenically unsaturated monomer component that forms the hydrogel polymer, wherein a ratio (A:B) is in a range from 99:1 to 70:30, where A is a moisture content (A) of the first-dried gel and B is a moisture amount (B) added with a post-crosslinking agent for the post-crosslinking reaction. |
地址 |
Hyogo JP |