Patents by Inventor Hyung-Mann Lee

Hyung-Mann Lee 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: 5508381
    Abstract: The present invention provides an improved process for preparing a highly water absorbent resin having a superior suction power and excellent gel strength, which consists essentially of:(1) neutralizing acrylic acid to a neutralization degree ranging from 50 to 100% based on the total number of moles of the acid employed and polymerizing it by a reverse phase suspension polymerization to provide a neutralized polymer;(2) dehydrating the polymer until its water content reaches 25% by weight or less based on the weight of the polymer through an azeotropic distillation thereof in the presence of a lipophilic solvent;(3) crosslinking the dehydrated polymer in the presence of a hydrophilic crosslinking agent containing at least two epoxy groups in an amount ranging from 0.05 to 5.0% by weight and water added in an amount ranging from 7.0 to 25.
    Type: Grant
    Filed: June 15, 1994
    Date of Patent: April 16, 1996
    Assignee: Lucky Limited
    Inventors: Tae-Hwan Jang, Su-Beom Choi, Hyung-Mann Lee, Myung-Joong Kim