Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Reexamination Certificate
2008-05-27
2008-05-27
Zemel, Irina S (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
C521S056000, C521S149000, C521S150000, C523S340000, C528S481000, C528S494000, C528S495000, C528S499000
Reexamination Certificate
active
07378453
ABSTRACT:
A surface crosslinking treatment method of a water-absorbing resin powder is disclosed that can overcome various problems in production encountered in the production of surface crosslinked water-absorbing resin powders on an industrial scale and can produce a water-absorbing resin powder having excellent physical properties without causing deterioration in physical properties of resin. The surface crosslinking treatment method of a water-absorbing resin powder includes adding a surface crosslinking agent to a water-absorbing resin powder and heat treating the mixture, wherein (1) the water-absorbing resin powder after the heat treatment is stirred and cooled under an air flow; (2) the water-absorbing resin powder after the heat treatment is cooled under an air flow, and at the same time, at least a part of fine particles of the water-absorbing resin powder and/or the residual crosslinking agent is removed by the air flow; or (3) the water-absorbing resin powder after the heat treatment is cooled and simultaneously granulated, and preferably an aqueous solution is added to the water-absorbing resin powder at a temperature of 40-100° C. during the cooling treatment.
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European Search Report dated Aug. 16, 2004.
Dairoku Yorimichi
Ishizaki Kunihiko
Mizutani Noriaki
Nogi Kozo
Sakamoto Shigeru
Nippon Shokubai Co. , Ltd.
Sughrue & Mion, PLLC
Zemel Irina S
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