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Patents

Method for Preparing Superabsorbent Polymer:

U.S. Patent No. 10,857,044

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By: Karen McIntyre

Editor, Nonwovens Industry

Min Ho Hwang, Daejeon, South Korea; Sang Gi Lee, Daejeon, South Korea; Hye Mi Nam, Daejeon, South Korea; Soo Jin Lee, Daejeon, South Korea; and Tae Hwan Jang, Daejeon, South Korea.
Assigned to LG Chem, Ltd., South Korea.

Filed: 4/29/16
Issued: 12/8/20

A method for preparing a superabsorbent polymer comprising: irradiating light within 9 seconds from the moment when a water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups makes contact with a foaming agent, and performing crosslinking polymerization via light irradiation of a monomer mixture containing the water-soluble ethylenically unsaturated monomer having at least partially neutralized acidic groups, and the foaming agent, in the presence of an internal crosslinking agent to prepare a hydrogel polymer; drying, pulverizing, and classifying the hydrogel polymer to form a base polymer powder; and additionally crosslinking a surface of the base polymer powder in the presence of a surface crosslinking agent to form a surface-crosslinked layer, wherein the superabsorbent polymer has a centrifuge retention capacity (CRC) for a physiological saline solution of 29 to 33 g/g and absorbency under load (AUL) of under 0.9 psi for a physiological saline solution of 14 to 22 g/g, and a vortex time of 20 to 40 seconds.

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