Method for producing polyacrylic acid (salt)-based water-absorbent resin
AssigneeNippon Shokubai Co., Ltd.
InventorsShinichi Fujino, Kunihiko Ishizaki, Satoshi Matsumoto
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Abstract
A method for producing polyacrylic acid (salt)-based water-absorbing resin includes a step of polymerizing an acrylic acid (salt)-based aqueous monomer solution, the polymerization step involving use of a polymerization reaction apparatus including a polymerization reaction unit covered with a casing, the polymerization step involving a polymerization reaction under internal pressure of the polymerization reaction unit, the internal pressure being slightly reduced and having a pressure reduction level of more than 0 kPa and not more than 10 kPa relative to the ambient pressure at the periphery of the polymerization reaction unit.
Claims17
A method for producing polyacrylic acid (salt)-based water-absorbing resin comprising a step of polymerizing an acrylic acid (salt)-based aqueous monomer solution,
- wherein a polymerization reaction apparatus used in said polymerization step has a polymerization reaction unit covered with a casing, and
- wherein, in said polymerization step, a polymerization reaction is carried out under conditions that internal pressure of said polymerization reaction unit is reduced by a range of more than 0 kPa and not more than 10 kPa relative to ambient pressure at the periphery of said polymerization reaction unit.
Dependencies are inferred from the claim text.