Patents by Inventor Heikki Kalervo Siistonen

Heikki Kalervo Siistonen 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).

  • Poly(lactic acid) stereocomplex
    Patent number: 7795358
    Abstract: Poly(lactic acid) blends having a relatively high heat distortion temperature can be prepared by simple blending of PLA polymers of opposite stereoforms, followed by processing, e.g. by injection molding, under specific conditions of temperature and pressure, so as to produce a blend which, on differential scanning calorimetry, exhibits two peaks within the melting range of the stereocomplex. Moreover, by careful selection of these conditions of temperature and pressure, it is possible to use PLA polymers of significantly higher molecular weights than previously thought possible.
    Type: Grant
    Filed: February 22, 2008
    Date of Patent: September 14, 2010
    Assignee: Tate & Lyle Public Limited Company
    Inventors: Nils Dan Anders Södergard, Erik Mikael Stolt, Heikki Kalervo Siistonen, Geoffrey A.R. Nobes
  • Polylactic Acid Stereocomplex
    Publication number: 20080207840
    Abstract: Polylactic acid blends having a relatively high heat distortion temperature can be prepared by simple blending of PLA polymers of opposite stereoforms, followed by processing, e.g. by injection moulding, under specific conditions of temperature and pressure, so as to produce a blend which, on differential scanning calorimetry, exhibits two peaks within the melting range of the stereocomplex. Moreover, by careful selection of these conditions of temperature and pressure, it is possible to use PLA polymers of significantly higher molecular weights than previously thought possible.
    Type: Application
    Filed: February 22, 2008
    Publication date: August 28, 2008
    Inventors: Nils Dan Anders Sodergard, Erik Mikael Stolt, Heikki Kalervo Siistonen, Geoffrey A.R. Nobes