Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Reexamination Certificate
2005-04-05
2005-04-05
Kiliman, Ieszek B (Department: 1773)
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
C428S403000, C428S407000, C525S329700, C525S330100, C525S384000, C521S064000
Reexamination Certificate
active
06875511
ABSTRACT:
The present invention provides: a production process for a particulate water-absorbent resin with high productivity, which production process is carried out in such a manner that the particulate water-absorbent resin will contain particles with particle diameters of 150 to 850 μm (but excluding 850 μm) in an amount of not smaller than 75 weight % of the particulate water-absorbent resin after the pulverization step or after the pulverization step and the drying step even if the adjustment of the particle diameters is not carried out by the sieving classification procedure; a novel particulate water-absorbent resin having high properties; and a sanitary material comprising this particulate water-absorbent resin. The production process for a particulate water-absorbent resin, according to the present invention, is carried out in such a manner that the particulate water-absorbent resin will contain particles with particle diameters of 150 to 850 μm (but excluding 850 μm) in an amount of not smaller than 75 weight % of the particulate water-absorbent resin after the pulverization step or after the pulverization step and the drying step; with the production process being characterized in that, in the pulverization step, a hydropolymer of a water-absorbent resin having a water content of 10 to 30 weight % is pulverized with a pulverizer.
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Dairoku Yorimichi
Fujino Shin-ichi
Irie Yoshio
Nagasawa Makoto
Tada Kenji
Kiliman Ieszek B
Nippon Shokubai Co. , Ltd.
Roylance Abrams Berdo & Goodman L.L.P.
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