Patents by Inventor Chui Hee Ryu

Chui Hee Ryu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11286321
    Abstract: The present invention relates to a super absorbent polymer. The super absorbent polymer according to the present invention includes surface crosslinked polymer particles prepared by surface crosslinking particles of a base resin, wherein the base resin is polymerized from water-soluble ethylene-based unsaturated monomers, and a water-soluble component, in which the water-soluble component is present in an amount of 5% by weight or less based on the total weight of the super absorbent polymer, when measured after free swelling the super absorbent polymer in a 0.9% NaCl solution for 1 hour, and the super absorbent polymer has a permeability of 50 seconds or shorter. According to the present invention, provided is a super absorbent polymer having excellent liquid permeability even when swollen without a reduction in centrifuge retention capacity or absorbency under load while having improved permeability.
    Type: Grant
    Filed: February 22, 2019
    Date of Patent: March 29, 2022
    Inventors: Chui Hee Ryu, Hyemin Lee