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US 12,338,331 B2Granted
Method for preparing superabsorbent polymer
AssigneeLG Chem, Ltd.
InventorsSe Yeol Park, Gicheul Kim, Yun Kyung Do, Sangwon Han
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Abstract
This invention relates to a method for preparing a superabsorbent polymer, more specifically to a method for preparing a superabsorbent polymer that uses stearic acid or salts thereof in the process of reassembling fine powders, thereby improving processability in the preparation process of the superabsorbent polymer, and realizing excellent absorption properties.
Claims8
A method for preparing superabsorbent polymer, comprising:
- preparing a monomer composition comprising acrylic acid based monomers having acid groups of which at least a part are neutralized, an internal crosslinking agent, and a polymerization initiator;
- conducting crosslinking polymerization of the monomer composition to form hydrogel polymer;
- drying and grinding the hydrogel polymer, and classifying into base resin normal particles having particle diameters greater than 150 μm and 850 μm or less, and fine powders having particle diameters of 150 μm or less;
- and
- mixing the fine powders with stearic acid or salts thereof to prepare fine powder reassembly.
2 more elements
Dependencies are inferred from the claim text.