Patents by Inventor Purnama Purba

Purnama Purba 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).

  • Method for preparing biodegradable polymer stereocomplexes using a supercritical fluid-organic solvent system and stereocomplexes prepared by the same
    Patent number: 8716398
    Abstract: The present invention relates to methods for preparing biodegradable polymer stereocomplexes using a supercritical fluid-organic solvent system and polymer stereocomplexes prepared by such methods. The method of the present invention involves introducing two types of homopolymers having different stereostructures and a small amount of organic solvent into a reactor, adding a supercritical fluid thereto, followed by applying a specific temperature and pressure to form a polymer stereocomplex having a crystalline structure. According to the method of the present invention, biodegradable polymer stereocomplexes in the form of powder or porous foam having excellent thermal and mechanical stabilities can be prepared in a simple, economical and environmentally-friendly manner in a single process.
    Type: Grant
    Filed: November 17, 2010
    Date of Patent: May 6, 2014
    Assignee: Korea Institute of Science and Technology
    Inventors: Soo Hyun Kim, Young Mee Jung, Sang-Heon Kim, Purnama Purba
  • METHOD FOR PREPARING BIODEGRADABLE POLYMER STEREOCOMPLEXES USING A SUPERCRITICAL FLUID-ORGANIC SOLVENT SYSTEM AND STEREOCOMPLEXES PREPARED BY THE SAME
    Publication number: 20110201710
    Abstract: The present invention relates to methods for preparing biodegradable polymer stereocomplexes using a supercritical fluid-organic solvent system and polymer stereocomplexes prepared by such methods. The method of the present invention involves introducing two types of homopolymers having different stereostructures and a small amount of organic solvent into a reactor, adding a supercritical fluid thereto, followed by applying a specific temperature and pressure to form a polymer stereocomplex having a crystalline structure. According to the method of the present invention, biodegradable polymer stereocomplexes in the form of powder or porous foam having excellent thermal and mechanical stabilities can be prepared in a simple, economical and environmentally-friendly manner in a single process.
    Type: Application
    Filed: November 17, 2010
    Publication date: August 18, 2011
    Inventors: Soo Hyun Kim, Young Mee Jung, Sang-Heon Kim, Purnama Purba