Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Reexamination Certificate
2006-08-15
2006-08-15
Lipman, Bernard (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
C521S056000, C524S500000, C524S501000, C524S502000, C524S515000, C526S072000, C526S210000, C526S317100, C528S481000, C528S503000
Reexamination Certificate
active
07091253
ABSTRACT:
The present invention provides a production process by which a water-absorbent resin of excellent quality can be obtained at a low cost by reasonable steps in aqueous solution polymerization. The process for producing a water-absorbent resin comprises the step of polymerizing an aqueous solution of water-absorbent resin-forming monomers including acrylic acid and/or its sodium salt as major components, wherein: (1) the aqueous solution has a monomer component concentration of not less than 45 weight %; (2) the polymerization is carried out while water is evaporated so that the ratio (concentration ratio) between a solid component concentration in a hydropolymer as formed by the polymerization and a solid component concentration in the aqueous monomer solution will not be less than 1.10; and (3) the solid component concentration in the hydropolymer as formed by the polymerization is not more than 80 weight %.
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Azumi Takashi
Dairoku Yorimichi
Fujino Shin-ichi
Fujita Yasuhiro
Irie Yoshio
Lipman Bernard
Nippon Shokubai Co. , Ltd.
Roylance Abrams Berdo & Goodman L.L.P.
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