Method for producing polyacrylic acid (salt)-based water-absorbable resin
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United States of America Patent
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Feb 20, 2018
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Mar 2, 2015
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Mar 3, 2014
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Abstract
The present invention provides a method for producing, by adding an additive and/or gas bubbles to a monomer with high efficiency, a polyacrylic acid (salt)-based water-absorbing resin having high physical properties while high productivity is maintained. The step of preparing an aqueous monomer solution includes the steps of: preparing an aqueous solution; and adding a water-insoluble additive and/or gas bubbles. A retention time from when the water-insoluble additive and/or the gas bubbles is/are added to when polymerization starts is 1 second to 60 seconds.
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