Patents by Inventor Jingjiang Liu

Jingjiang Liu 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).

  • Blends of carbon dioxide-propylene oxide copolymer and poly (3-hydroxyalkanoate) and a method of making the same
    Patent number: 6576694
    Abstract: The present invention provides blends comprising 30-70 parts by weight of poly(3-hydroxyalkanoate) (PHA) resin, 70-30 parts by weight of higher molecular weight carbon dioxide-propylene oxide copolymers (PPC) with over 98% alternating copolymer structure, 1-10 parts by weight of talcum powder, 0.2-3 parts by weight of boron nitride, and 0.1-2 parts by weight antioxidant(s), where the sum of parts of PHA and PPC is 100 parts by weight. The present invention also provides for a method of preparing the blends, which may comprise the step of extrusion and pelletization in a conventional twin-screw extruder. The melt mass in the twin-screw extruder is kept in the range of 175° C.-185° C. The blends can be used in extrusion of plates and sheets, preparation of films and in injection molding. These fabricated articles possess biodegradable property, good mechanical properties, good printing property, good barrier property and sealing property.
    Type: Grant
    Filed: June 10, 2002
    Date of Patent: June 10, 2003
    Assignee: Changchun Institute of Applied Chemistry Chinese Academy of Science
    Inventors: Jingjiang Liu, Chunrong Sun