Process for producing water-absorbing resin particles,...

Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter

Reexamination Certificate

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Details

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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Online machine translation of JP 07-088,171, 1995.
Notification of Transmittal of Translation of the International Preliminary Report on Patentability (Form PCT/IB/338) of International Application No. PCT/JP2006/309406 mailed Nov. 29, 2007 with Forms PCT/IB/373, PCT/ISA/237, and PCT/IB/326.
International Search Report of PCT/JP2006/309406, date of mailing Aug. 8, 2006.
Supplementary European Search Report date Sep. 30, 2010, issued in corresponding European Patent Application No. 06746220.0.

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