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US 10,894,245 B2Granted
Method for preparing superabsorbent polymer
AssigneeLG Chem, Ltd.
InventorsJun Kyu Kim, Jae Ho Oh, Yeong Bin Jo, Tae Hwan Jang
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Abstract
The present invention relates to a method for preparing a superabsorbent polymer having excellent absorption performance, and more specifically, to a method for preparing a superabsorbent polymer that can effectively inhibit the initiation of a polymerization reaction in a pipe, before being introduced into a polymerization reactor, thus preventing process trouble.
Claims12
A method for preparing a superabsorbent polymer comprising:
- A) introducing an oxygen-containing gas into an aqueous monomer mixture comprising water soluble ethylenically unsaturated monomers having acid groups of which at least a part are neutralized, a crosslinking agent, and a polymerization inhibitor that inhibits polymerization of the water soluble ethylenically unsaturated monomers in the presence of oxygen to form the aqueous monomer mixture into which the oxygen-containing gas is introduced;
- B) transferring the aqueous monomer mixture into which the oxygen-containing gas is introduced to a polymerization reactor;
- C) removing oxygen from the aqueous monomer mixture into which the oxygen-containing gas is introduced immediately before the aqueous monomer mixture into which the oxygen-containing gas is introduced is introduced into the polymerization reactor;
- and
- D) progressing crosslinking polymerization of the water soluble ethylenically unsaturated monomers in the polymerization reactor, to form a hydrogel polymer comprising a first crosslinked polymer.
2 more elements
Dependencies are inferred from the claim text.