Patents by Inventor Andreas Frankenau

Andreas Frankenau 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 and device for the production of elastomer-modified thermoplastics
    Patent number: 7368061
    Abstract: A continuous process for the production of an elastomer-modified thermoplastic is disclosed. The process entails (i) obtaining graft elastomer (D) having residual moisture content of 1 to 50 wt. %, particularly 5 to 50 wt. %, particularly preferably 10 to 40 wt. %, (ii) introducing (D) and thermoplastic resin (B) through an inlet to a reactor operating under conditions calculated to melt (D) and (B) and to remove organic volatile components C) to produce a molten blend, the reactor being equipped with a plurality of kneading bars, that convey a portion of the molten blend towards the reactor inlet.
    Type: Grant
    Filed: April 16, 2004
    Date of Patent: May 6, 2008
    Assignee: Lanxess Deutschland GmbH
    Inventors: Alfred Eitel, Haakan Jonsson, Ulrich Liesenfelder, Stefan Moss, Ricarda Nothelle, Andreas Frankenau, Stephen Böhmer
  • 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
  • Process and device for the production of elastomer-modified thermoplastics
    Publication number: 20050014897
    Abstract: A continuous process for the production of an elastomer-modified thermoplastic is disclosed. The process entails (i) obtaining graft elastomer (D) having residual moisture content of 1 to 50 wt. %, particularly 5 to 50 wt. %, particularly preferably 10 to 40 wt. %, (ii) introducing (D) and thermoplastic resin (B) through an inlet to a reactor operating under conditions calculated to melt (D) and (B) and to remove organic volatile components C) to produce a molten blend, the reactor being equipped with a plurality of kneading bars, that convey a portion of the molten blend towards the reactor inlet.
    Type: Application
    Filed: April 16, 2004
    Publication date: January 20, 2005
    Inventors: Alfred Eitel, Haakan Jonsson, Ulrich Liesenfelder, Stefan Moss, Ricarda Nothelle, Andreas Frankenau, Stephen Bohmer
  • Process for the separation of residual monomers and oligomers from polycarbonate
    Publication number: 20040116648
    Abstract: An improvement to the process of producing polycarbonate resin by the phase interface method is disclosed. The improvement comprising adding at least one chlorinated aromatic hydrocarbon to the organic phase.
    Type: Application
    Filed: October 15, 2003
    Publication date: June 17, 2004
    Inventors: Stefan Westernacher, Hermann Kauth, Klaus Fassbender, Bernd Willenberg, Andreas Frankenau, Rainer Mellis, Gary Conklin, Christoph Biedron
  • Process for the production of polycarbonate which is damaged to a particularly small extent by oxygen
    Publication number: 20040103717
    Abstract: A process for producing polycarbonate is disclosed. The process entails using equipment having leakage rate less than 10−3 liter He×mbar/sec. The polycarbonate thus produced is characterized by its enhanced thermal stability.
    Type: Application
    Filed: October 17, 2003
    Publication date: June 3, 2004
    Inventors: Stefan Westernacher, Wolfgang Ebert, Klaus Fassbender, Bernd Willenberg, Andreas Frankenau, Hermann Kauth, Gary Conklin, Christoph Biedron, Melanie Mothrath, Uwe Hucks, Ute Wollborn, Claus-Ludolf Schultz
  • Thermostable iron oxide pigments, processes for their production, as well as their use
    Patent number: 5300146
    Abstract: Iron oxide pigments are made stable against oxidation and discoloration by a coating process. Preferred coating compounds are maleic acid hydrazide and phthalic acid.
    Type: Grant
    Filed: November 16, 1992
    Date of Patent: April 5, 1994
    Assignee: Bayer AG
    Inventors: Friedrich Jonas, Andreas Frankenau, Gunter Buxbaum