Patents by Inventor Gernot Loehr

Gernot Loehr 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).

  • Patent number: 7754914
    Abstract: The present invention provides a method of recovering a fluorinated acid surfactant or salt thereof from adsorbent particles to which said fluorinated acid surfactant has been adsorbed. The method comprises mixing adsorbent particles having adsorbed fluorinated acid surfactant or salt thereof with an alcohol and optionally an acid. The mixture is generally heated to cause esterification of the fluorinated acid surfactant or salt thereof with the alcohol so as to form an ester derivative of the fluorinated acid surfactant, distilling the mixture to form a distillate comprising the ester derivative, separating the ester derivative from the distillate and optionally feeding the remainder of the distillate back into the mixture.
    Type: Grant
    Filed: January 14, 2005
    Date of Patent: July 13, 2010
    Assignee: 3M Innovative Properties Company
    Inventors: Stephan Führer, Klaus Hintzer, Gernot Löhr, Egon Obermaier, Werner Schwertfeger
  • Patent number: 7462667
    Abstract: The present invention provides an aqueous coating composition comprising (i) particles of a non-melt processible polymer of tetrafluoroethylene and (ii) a non-fluorinated polymer selected from the group consisting of a polysulfone, a polyamide, a polyimide, a polyamide-imide, a polybismaleimide and mixtures thereof, wherein said particles are core-shell particles whereby the shell comprises a copolymer of tetrafluoroethylene and a partially fluorinated or non-fluorinated comonomer. The aqueous coating composition may be used for providing a primer coating on a substrate such as a metal or glass substrate. Such primer coating may provide good or excellent non-stick coatings combined with good or excellent scratch and wear resistance of the coating. Also, such primer coating may provide for good to excellent PTFE coatings that can resist hot salt water. The aqueous coating composition may also be used to provide other coating layers of a multi-layer coating.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: December 9, 2008
    Assignee: 3M Innovative Properties Company
    Inventors: Michael C. Dadalas, Klaus Hintzer, Gernot Loehr, Tilman Zipplies
  • Patent number: 7358296
    Abstract: Fluorine-containing emulsifiers can be removed from fluoropolymer dispersions by adding to the dispersion a non ionic emulsifier, removing the fluorine-containing emulsifier by contact with an anion exchanger and separating the dispersion from the anion exchanger. The resulting dispersions can be concentrated and used for coating applications.
    Type: Grant
    Filed: October 21, 2004
    Date of Patent: April 15, 2008
    Assignee: 3M Innovative Properties Company
    Inventors: Hermann Blädel, Klaus Hintzer, Gernot Löhr, Werner Schwertfeger, Reinhard Albert Sulzbach
  • Patent number: 7342066
    Abstract: The present invention provides an aqueous non-melt processible polytetrafluoroethylene dispersion comprising non-melt processible polytetrafluoroethylene particles in an amount between 30 and 70% by weight based on the total weight of the dispersion and one or more non-ionic surfactants and wherein at least a part of said non-melt processible polytetrafluoroethylene particles comprise polytetrafluoroethylene polymer chains having repeating units comprising ionic groups. The invention further provides a method for obtaining the dispersions.
    Type: Grant
    Filed: October 4, 2004
    Date of Patent: March 11, 2008
    Assignee: 3M Innovative Properties Company
    Inventors: Michael C. Dadalas, Klaus Hintzer, Gernot Loehr, Tilman Zipplies
  • Patent number: 7294668
    Abstract: An aqueous non-melt processible polytetrafluoroethylene dispersion having non-melt processible polytetrafluoroethylene particles in an amount of 30 to 70% by weight and an amount of non-ionic surfactant between 2 and 15% by weight based on the weight of polytetrafluoroethylene solids. The dispersion is free of fluorinated surfactant or contains fluorinated surfactant in amounts of not more than 200 ppm based on the amount of polytetrafluoroethylene solids. At least part of the non-melt processible polytetrafluoroethylene particles comprise an effective amount of ionic end groups in the polytetrafluoroethylene polymer chains.
    Type: Grant
    Filed: February 7, 2006
    Date of Patent: November 13, 2007
    Assignee: 3M Innovative Properties Company
    Inventors: Tilman Zipplies, Klaus Hintzer, Michael C. Dadaias, Gernot Loehr
  • Patent number: 7253240
    Abstract: Use of non-water-soluble organic fluorinated compounds, which are gaseous under the polymerization conditions and act as chain transfer agent in the gas phase, as explosion suppressors in the emulsion polymerization of tetrafluoroethylene.
    Type: Grant
    Filed: November 29, 2001
    Date of Patent: August 7, 2007
    Assignee: 3M Innovative Properties Company
    Inventors: Klaus Hintzer, Albert Killich, Gernot Löhr, Hans-Josef Staudt
  • Patent number: 7252744
    Abstract: A method of treating a fluorocarbon feedstock includes generating, in a high temperature zone, an electrical arc between at least one cathode and at least one anode, generating in the high temperature zone and by means of the electrical arc and a plasma gas, an upwardly burning thermal plasma having a tail flame, allowing a solid particulate fluorocarbon feedstock comprising at least on fluorocarbon compound to form a reactive thermal mixture with the thermal plasma tail flame, with the fluorocarbon compound dissociating into at least one fluorocarbon precursor or reactive species, and cooling the reactive thermal mixture to form, from the fluorocarbon precursor of reactive species, at least one more desirable fluorocarbon compound.
    Type: Grant
    Filed: February 9, 2001
    Date of Patent: August 7, 2007
    Assignees: South African Nuclear Energy Corporation Limited, 3M Innovative Properties Company
    Inventors: Izak Jacobus Van Der Walt, Klaus Hintzer, Gernot Löhr
  • Patent number: 7250540
    Abstract: A process for manufacturing fluoroolefins comprising perfluorinating a starting material comprising at least one carbon-bonded hydrogen by electrochemical fluorination, dissociating this separated effluent in a pyrolysis, quenching and separating the effluent to yield tetrafluoroethylene and/or hexafluoropropylene.
    Type: Grant
    Filed: June 29, 2005
    Date of Patent: July 31, 2007
    Assignee: 3M Innovative Properties Company
    Inventors: Gerald L. Bauer, Jeffrey D. Weigelt, Klaus Hintzer, Gernot Loehr, Werner Schwertfeger, Arthur A. Ponelis
  • Patent number: 7148301
    Abstract: The invention relates to high purity fluoropolymers and processes for making such materials. These polymers are particularly suited for applications in the semiconductor industry. The process comprises removal of unstable polymer end groups by fluorination and removal of heavy metal impurities by extraction with an aqueous acid medium.
    Type: Grant
    Filed: December 22, 2003
    Date of Patent: December 12, 2006
    Assignee: 3M Innovative Properties Company
    Inventors: Thomas J. Blong, Denis Duchesne, Gernot Loehr, Albert Killich, Tilman Zipplies, Ralph Kaulbach, Herbert Strasser
  • Patent number: 7094839
    Abstract: Aqueous microemulsions obtained from a perfluorinated alkane sulphonic or carboxylic acid or salt thereof, a liquid fluorinated monomer comprising a cure-site and optionally an inert liquid and highly fluorinated hydrocarbon compound. The aqueous microemulsion may be formed by mixing together water, a perfluorinated alkane sulphonic or carboxylic acid or salt thereof, optionally an inert liquid and highly fluorinated hydrocarbon compound and a liquid fluorinated monomer having a cure-site.
    Type: Grant
    Filed: July 25, 2003
    Date of Patent: August 22, 2006
    Assignee: 3M Innovative Properties Company
    Inventors: Werner M. A. Grootaert, Klaus Hintzer, Bernhard Hirsch, Harald Kaspar, Robert E. Kolb, Gernot Löhr, Werner Schwertfeger
  • Patent number: 7064170
    Abstract: Provided is a process for making a copolymer of fluorinated olefin and hydrocarbon olefin selected from ethylene, propylene and mixtures thereof, the process comprising a substantially emulsifier free aqueous emulsion polymerization of said fluorinated olefin and said hydrocarbon olefin, optionally in the presence of fluoropolymer particles and/or fluorinated liquid in a form suitable to improve the copolymerization of fluorinated olefin and hydrocarbon olefin.
    Type: Grant
    Filed: October 21, 2003
    Date of Patent: June 20, 2006
    Assignee: 3M Innovative Properties Company
    Inventors: Harald Kaspar, Peter J. Scott, Klaus Hintzer, Gernot Löhr
  • Publication number: 20060128872
    Abstract: An aqueous non-melt processible polytetrafluoroethylene dispersion having non-melt processible polytetrafluoroethylene particles in an amount of 30 to 70% by weight and an amount of non-ionic surfactant between 2 and 15% by weight based on the weight of polytetrafluoroethylene solids. The dispersion is free of fluorinated surfactant or contains fluorinated surfactant in amounts of not more than 200 ppm based on the amount of polytetrafluoroethylene solids. At least part of the non-melt processible polytetrafluoroethylene particles comprise an effective amount of ionic end groups in the polytetrafluoroethylene polymer chains.
    Type: Application
    Filed: February 7, 2006
    Publication date: June 15, 2006
    Inventors: Tilman Zipplies, Klaus Hintzer, Michael Dadalas, Gernot Loehr
  • Patent number: 7041728
    Abstract: The present invention provides a method of making an aqueous dispersion of non-melt processible polytetrafluoroethylene, the method comprising: (a) an aqueous emulsion polymerization of an amount of tetrafluoroethylene to produce a final amount of polytetrafluoroethylene solids and optionally up to 1% by weight based on the amount of tetrafluoroethylene of a perfluorinated comonomer, wherein said aqueous emulsion polymerization is initiated with a free radical initiator and the polymerization is carried out in the presence of a fluorinated surfactant, and wherein before completing the feeding of said amount of tetrafluoroethylene but after feeding at least 80% by weight of said amount of tetrafluoroethylene, free radicals capable of introducing ionic end groups or precursors thereof in the polytetrafluoroethylene polymer are caused to be formed at a rate that without counter measures would cause an increase in the polymerization rate of at least 20%; (b) reducing the amount of fluorinated surfactant in the th
    Type: Grant
    Filed: October 12, 2004
    Date of Patent: May 9, 2006
    Assignee: 3M Innovative Properties Company
    Inventors: Tilman Zipplies, Klaus Hintzer, Michael C. Dadalas, Gernot Loehr
  • Publication number: 20060003168
    Abstract: The present invention provides an aqueous coating composition comprising (i) particles of a non-melt processible polymer of tetrafluoroethylene and (ii) a non-fluorinated polymer selected from the group consisting of a polysulfone, a polyamide, a polyimide, a polyamide-imide, a polybismaleimide and mixtures thereof, wherein said particles are core-shell particles whereby the shell comprises a copolymer of tetrafluoroethylene and a partially fluorinated or non-fluorinated comonomer. The aqueous coating composition may be used for providing a primer coating on a substrate such as a metal or glass substrate. Such primer coating may provide good or excellent non-stick coatings combined with good or excellent scratch and wear resistance of the coating. Also, such primer coating may provide for good to excellent PTFE coatings that can resist hot salt water. The aqueous coating composition may also be used to provide other coating layers of a multi-layer coating.
    Type: Application
    Filed: June 30, 2005
    Publication date: January 5, 2006
    Inventors: Michael Dadalas, Klaus Hintzer, Gernot Loehr, Tilman Zipplies
  • Publication number: 20050240067
    Abstract: A process for manufacturing fluoroolefins comprising perfluorinating a starting material comprising at least one carbon-bonded hydrogen by electrochemical fluorination, dissociating this separated effluent in a pyrolysis, quenching and separating the effluent to yield tetrafluoroethylene and/or hexafluoropropylene.
    Type: Application
    Filed: June 29, 2005
    Publication date: October 27, 2005
    Inventors: Gerald Bauer, Jeffrey Weigelt, Klaus Hintzer, Gernot Loehr, Werner Schwertfeger, Arthur Ponelis
  • Patent number: 6943228
    Abstract: A curable fluoroelastomer composition for preparing a perfluoroelastomer. The composition includes; (1) a perfluoropolymer having one or more cure-sites selected from a halogen capable of participating in peroxide cure reaction and/or nitrile groups; (2) an organic peroxide and/or a compound capable of effecting curing of the perfluoropolymer through said nitrile groups; and (3) optionally a polyunsaturated coagent. The perfluoropolymer in the composition is essentially free of ionic end groups and the total amount of metal cations in the composition is not more than 10 ?g/g perfluoropolymer. The perfluoroelastomers may be obtained from curing the composition in a sufficiently low amount of metal cations so as to make the fluoroelastomer suitable for use in the semi-conductor industry.
    Type: Grant
    Filed: July 25, 2003
    Date of Patent: September 13, 2005
    Assignee: 3M Innovative Properties Company
    Inventors: Werner M. A. Grootaert, Klaus Hintzer, Bernhard Hirsch, Harald Kaspar, Robert E. Kolb, Gernot Löhr, Werner Schwertfeger
  • Publication number: 20050192397
    Abstract: The present invention provides a method of coating a substrate having a surface defined by a layer of fluoropolymer. The method utilizes an aqueous dispersion that includes: particles of melt-processible fluoropolymer in an amount of 30 to 70% by weight; a fluorinated surfactant in an amount of not more than 250 ppm based on fluoropolymer solids of the aqueous dispersion; and a non-ionic surfactant comprising an ethoxylated aliphatic alcohol in an amount of 2 to 15% by weight based on total solids of the aqueous dispersion. The aqueous dispersion is free or substantially free of aromatic group containing non-ionic surfactants. The aqueous dispersion may be optionally diluted and/or modified with additional components to obtain a coating composition. The coating composition may then be applied on at least part of the surface of the substrate to define the fluoropolymer layer.
    Type: Application
    Filed: January 21, 2005
    Publication date: September 1, 2005
    Inventors: Michael Dadalas, Klaus Hintzer, Gernot Loehr, Tilman Zipplies
  • Patent number: 6933357
    Abstract: High purity fluoropolymers are obtained by the emulsion polymerization process, removing essentially all ions and coagulating the polymer essentially without adding ions. These polymers are useful in the field of electronic devices.
    Type: Grant
    Filed: February 24, 2004
    Date of Patent: August 23, 2005
    Assignee: 3M Innovative Properties Company
    Inventors: Werner M. A. Grootaert, Georg Burkard, William D. Coggio, Klaus Hintzer, Bernhard Hirsch, Robert E. Kolb, Albert Killich, Gernot Loehr
  • Patent number: 6919015
    Abstract: A process for manufacturing fluoroolefins comprising perfluorinating a starting material comprising at least one carbon-bonded hydrogen by electrochemical fluorination, dissociating this separated effluent in a pyrolysis, quenching and separating the effluent to yield tetrafluoroethylene and/or hexafluoropropylene.
    Type: Grant
    Filed: December 16, 2002
    Date of Patent: July 19, 2005
    Assignee: 3M Innovative Properties Company
    Inventors: Gerald L. Bauer, Jeffrey D. Weigelt, Klaus Hintzer, Gernot Loehr, Werner Schwertfeger, Arthur A. Ponelis
  • Patent number: RE40902
    Abstract: A tetrafluoroethylene/hexafluoropropylene copolymer with high drawability is provided. Also provided is a process employing the polymer and an article coated with the polymer.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: September 1, 2009
    Assignee: 3M Innovative Properties Company
    Inventors: Ralph Kaulbach, Albert Killich, Friedrich Kloos, Gernot Loehr, Ludwig Mayer, Erik Peters, Thomas J. Blong, Denis Duchesne