Patents by Inventor Christian Eh

Christian Eh 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).

  • Process for the preparation of polycarbonates
    Patent number: 7705107
    Abstract: An improvement to the phase interface process of preparing aromatic polycarbonate is disclosed. The process is characterized in that the phosgenation is carried out at 0 to 40° C., and in that the temperature of the reaction mixture at the time of addition of the catalyst at 10 to 40° C., and in that the molar ratio of aromatic dihydroxy compounds to phosgene at 1:1.05 to 1:1.20. The polycarbonate thus produced is characterized in its low content of carbamates, making it particularly suitable for the preparation of optical storage media.
    Type: Grant
    Filed: December 20, 2005
    Date of Patent: April 27, 2010
    Assignee: Bayer MaterialScience AG
    Inventors: Hermann Kauth, Wolfgang Ebert, Wilfried Haese, Helmut Einberger, Alexander Meyer, Andreas Frankenau, Uli Franz, Christian Eh, Stefaan De Vos, Bert Ruytinx
  • Process for the preparation of polycarbonates
    Publication number: 20060155098
    Abstract: An improvement to the phase interface process of preparing aromatic polycarbonate is disclosed. The process is characterized in that the phosgenation is carried out at 0 to 40° C., and in that the temperature of the reaction mixture at the time of addition of the catalyst at 10 to 40° C., and in that the molar ratio of aromatic dihydroxy compounds to phosgene at 1:1.05 to 1:1.20. The polycarbonate thus produced is characterized in its low content of carbamates, making it particularly suitable for the preparation of optical storage media.
    Type: Application
    Filed: December 20, 2005
    Publication date: July 13, 2006
    Inventors: Hermann Kauth, Wolfgang Ebert, Wilfried Haese, Helmut Einberger, Alexander Meyer, Andreas Frankenau, Uli Franz, Christian Eh, Stefaan De Vos, Bert Ruytinx