Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Reexamination Certificate
2011-08-23
2011-08-23
Le, Hoa (Department: 1788)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
C428S327000, C502S402000, C526S930000, C528S425000
Reexamination Certificate
active
08003210
ABSTRACT:
The present invention provides a process for producing water-absorbing resin particles which possess a high water retention capacity (absorbing capacity), a high water-absorbing capacity under pressure, and a high gel strength and a small amount of water-soluble substance and is favorably usable in sanitary materials; water-absorbing resin particles obtained by the process; and absorbent materials and absorbent articles made by using the particles. More specifically, the water-absorbing resin particles are produced by a process for producing water-absorbing resin particles, comprising a step of a post-crosslinking reaction by adding a post-crosslinking agent in at least two stages to a water-absorbing resin particle precursor obtained by polymerization of a water-soluble ethylenic unsaturated monomer to carry out the post-crosslinking reaction.
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Handa Masayoshi
Kobushi Hiromu
Nawata Yasuhiro
Le Hoa
Sumitomo Seika Chemicals Co. Ltd.
Westerman Hattori Daniels & Adrian LLP
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