Patents by Inventor Hae S. Jun

Hae S. Jun 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).

  • Biodegradable copolyester and method for preparing the same
    Patent number: 5484861
    Abstract: There is disclosed a biodegradable copolyester having a combination structure consisting of one or more repeating unit of alkyleneterephthalate and one or more repeating unit of hydroxyalkanoate, represented by the following general formula I: ##STR1## wherein n is an integer not more than 10, R is --CH.sub.3 or --C.sub.2 H.sub.5,X is, ##STR2## and a, b and c are independently a natural number, along with a preparation method therefor.An aromatic polyester have repeating unit of alkyleneterephthalate is reacted with an aliphatic polyester having repeating unit of hydroxyalkanoate at 100.degree. C. or more in a proper solvent, such as nitrobenzene and dimethylsulfoxide, in the presence of a catalyst, such as dibutyltin oxide, tin[IV] chloride, tin[IV] octoate, hexabutyl distannoxane, tributyltin methoxide, or tributyltin chloride. It is superior in biodegradability and can be produced in low cost.
    Type: Grant
    Filed: January 20, 1995
    Date of Patent: January 16, 1996
    Assignees: Cheil Synthetics Inc., Korea Advanced Institute of Science & Technology
    Inventors: Dae W. Ihm, Myung S. Lee, Hae S. Jun, Chang S. Lee, Jung: Sung G., Seong I. Woo