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Polyacrylic acid-type water absorbent resin and method for producing same
专利权人:
Nippon Shokubai Co.; Ltd.
发明人:
Toshihiro Takaai,Hidenori Wada,Sinichi Fujino
申请号:
US14723026
公开号:
US09315640B2
申请日:
2015.05.27
申请国别(地区):
US
年份:
2016
代理人:
摘要:
Provided is a method for producing a water absorbent resin, which promotes the formation of interconnected voids (continuous gas bubbles) in a foamed polymer (foam-like water absorbent resin) by a more convenient method, and produces with high efficiency a water absorbent resin which exhibits a high water absorption rate even when stepped into a sheet form or a powder form in hygiene articles and the like. Disclosed is a method for producing a polyacrylic acid-type water absorbent resin, comprising (A) a step of obtaining an aqueous solution of acrylic acid-type monomers containing gas bubbles dispersed therein; (B) a step of polymerizing the aqueous monomer solution and thereby obtaining a foamed polymer; and (C) a step of heating and drying the foamed polymer,wherein gas bubbles are incorporated such that the volumetric expansion factor defined by the following formula (1);[Formula 1]Volumetric expansion factor=(Volume of aqueous monomer solution after gas bubble dispersion)/(volume of aqueous monomer solution before gas bubble dispersion)  Formula (1);exceeds 1.1 times, and the aqueous monomer solution having a monomer concentration defined by the following formula (2); [Formula 2]Monomer concentration [wt %]=(Weight of a monomer)/{(weight of a monomer)+(weight of solvent)}×100  Formula (2);of 40% by weight or greater is boiling polymerized at a temperature of 100° C. or higher.
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