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AssigneeNippon Shokubai Co., Ltd.
InventorsNobuyuki Harada, Koji Miyake, Yoshihiro Motono, Hideyuki Tahara, Takumi Hatsuda, Teruyuki Kanto, Akito Yano, Yorimichi Dairoku, Kazuki Kimura, Yasuhiro Fujita
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A method for the production of a water-absorbent resin capable of fast water absorption is disclosed which comprises the steps of dispersing bubbles of an inert gas in an aqueous monomer solution of a mixture of a water-soluble unsaturated monomer and a water-soluble cross-linking monomer and subjecting the mixture to copolymerization under the condition that a volume of the monomer solution wherein the inert gas is dispersed is in the range of 1.02 to 5 times of a volume of non-dispersant state.
A method for the production of a water-absorbent resin capable of fast water absorption, comprising the steps of dispersing bubbles of an inert gas in an aqueous monomer solution of a mixture of a water-soluble unsaturated monomer and a water-soluble cross-linking monomer which contains a surfactant and subjecting said mixture to copolymerization, wherein the inert gas is dispersed in the monomer solution to increase the volume of said monomer solution in the range of 1.02 to 5 times of the volume of said monomer solution in a non-dispersed state and wherein the dispersion of said bubbles is accomplished by introducing said inert gas into said aqueous solution.
A method for the production of a hydrophilic polymer, comprising the steps of mixing an aqueous monomer solution containing a water-soluble ethylenically unsaturated monomer and a gas by fluid mixing thereby obtaining an aqueous monomer solution having bubbles dispersed therein and then polymerizing the monomer in the state of having said bubbles dispersed therein.
A method for the production of a water-absorbent resin, comprising a step of mixing water-absorbent resin particles with either a surface cross-linking agent containing at least two groups capable of reacting with the functional group contained in said water-absorbent resin or a mixed solution of said cross-linking agent and an organic solvent, a step of mixing said mixture of said water-absorbent resin particles and said surface cross-linking agent with an aqueous liquid, and then a step of reacting said water-absorbent resin with said surface cross-linking agent.
Dependencies are inferred from the claim text.