ALEXANDRIA, Va., March 24 -- United States Patent no. 12,583,980, issued on March 24, was assigned to LG Chem Ltd. (Seoul, South Korea).
"Preparation method of super absorbent polymer" was invented by Chang Hun Lee (Daejeon, South Korea), Jiyoon Jeong (Daejeon, South Korea) and Jung Eun Kim (Daejeon, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is a method for preparing superabsorbent polymer, which includes conducting first surface crosslinking of a base resin powder while raising the temperature to a first temperature, in the presence of a first surface crosslinking agent; conducting second surface crosslinking of the first surface crosslinked base resin powder at a second temperatur...