Patents by Inventor Klaus Hahn

Klaus Hahn 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).

  • Method for the production of expandable polystyrene
    Publication number: 20040249003
    Abstract: The invention relates to a process for the production of bead-form, expanded polystyrene by suspension polymerization of styrene in the presence of from 1 to 5% by weight of a hydrocarbon having from 4 to 6 carbon atoms and from 0.5 to 3.5% by weight of a saturated, aliphatic hydrocarbon having a boiling point above 70° C., but in the absence of a chain-transfer agent which causes a reduction in the molecular weight of the polystyrene.
    Type: Application
    Filed: March 11, 2004
    Publication date: December 9, 2004
    Inventors: Achim Datko, Klaus Hahn, Harald Larbig, Karl-Heinz Batscheider
  • Preparation of expandable propylene polymer beads
    Patent number: 6727291
    Abstract: A process prepares expandable propylene polymer beads by mixing propylene polymer melt with a volatile organic blowing agent and with a nucleating agent in an extruder, whereupon the extrusion and pelletization of the extruded takes place in a water bath under conditions of temperature and pressure at which practically no foaming of the pellets takes place.
    Type: Grant
    Filed: November 5, 2001
    Date of Patent: April 27, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Christian Maletzko, Klaus Hahn, Isidor de Grave, Gerd Ehrmann, Franz-Josef Dietzen
  • Expandable polyolefin particles
    Publication number: 20040054020
    Abstract: The invention relates to expandable polyolefin particles containing expanding agents, said particles being coated with between 0.01 and 3 wt. % of a salt and/or an ester of a long-chained fatty acid, preferably with calcium stearate, in order to prevent agglutination during expansion.
    Type: Application
    Filed: July 16, 2003
    Publication date: March 18, 2004
    Inventors: Christian Maletzko, Uwe Keppeler, Klaus Hahn, Isidor de Grave
  • Expanded polypropylene particles
    Patent number: 6677040
    Abstract: The invention relates to expanded polypropylene beads having a density of from 5 to 200 g/l and a bead diameter of from 1 to 10 mm which comprise from 0.002 to 20% by weight of graphite particles.
    Type: Grant
    Filed: June 14, 2001
    Date of Patent: January 13, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Frank Braun, Guiscard Glück, Klaus Hahn, Isidoor De Grave, Hermann Tatzel
  • Production of water-expandable styrene polymers
    Patent number: 6555638
    Abstract: A process for the preparation of styrene polymers containing water as the sole expanding agent by polymerization of styrene in aqueous suspension in the presence of an amphiphilic organic emulsifier which carries both hydrophilic and hydrophobic groups, or a polar group-containing, water-miscible polymer.
    Type: Grant
    Filed: December 28, 2001
    Date of Patent: April 29, 2003
    Assignee: BASF Aktiengesellschaft
    Inventors: Achim Datko, Peter Dodel, Klaus Hahn
  • Production of water-expandable styrene polymers
    Patent number: 6545062
    Abstract: The invention relates to a process for the production of styrene polymers containing water as expanding agent by suspension polymerization of styrene in the presence of an emulsifying auxiliary, the suspending agent being a mixture of water and an organic liquid which is water-miscible and which is virtually a non-solvent for polystyrene and has a boiling point below 100° C.
    Type: Grant
    Filed: January 11, 2002
    Date of Patent: April 8, 2003
    Assignee: BASF Aktiengesellschaft
    Inventors: Dietrich Lausberg, Klaus Hahn
  • Open-cell particulate foams
    Patent number: 6521672
    Abstract: Open-cell moldable foams are based on a thermoplastic matrix which comprises A. from 99 to 50% by weight of a styrene polymer and B. from 1 to 50% by weight of a polymer of low compatibility with the styrene polymer.
    Type: Grant
    Filed: November 13, 2001
    Date of Patent: February 18, 2003
    Assignee: BASF Aktiengesellschaft
    Inventors: Guiscard Glück, Franz-Josef Dietzen, Klaus Hahn, Gerd Ehrmann
  • Preparation of expandable propylene polymer beads
    Publication number: 20020185768
    Abstract: A process prepares expandable propylene polymer beads by mixing propylene polymer melt with a volatile organic blowing agent and with a nucleating agent in an extruder, whereupon the extrusion and pelletization of the extrudate takes place in a water bath under conditions of temperature and pressure at which practically no foaming of the pellets takes place.
    Type: Application
    Filed: November 5, 2001
    Publication date: December 12, 2002
    Applicant: BASF Aktiengesellschaft
    Inventors: Christian Maletzko, Klaus Hahn, Isidor De Grave, Gerd Ehrmann, Franz-Josef Dietzen
  • Expandable olefin bead polymers
    Patent number: 6476089
    Abstract: The invention relates to expandable olefin bead polymers which comprise a blowing agent with a boiling point of from −5 to 150° C., selected from the group consisting of alkanes, alkanols, ketones, ethers and esters. The particles are unfoamed and have a bulk density above 500 g/l, and can be foamed to a bulk density below 200 g/l after storage for one hour at room temperature in free contact with the atmosphere. They are prepared by impregnating polyolefin pellets in suspension in a pressure vessel with the blowing agent, cooling the batch below 100° C., reducing the pressure and isolating the particles.
    Type: Grant
    Filed: May 16, 2002
    Date of Patent: November 5, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Christian Maletzko, Klaus Hahn, Isidor de Grave, Gerd Ehrmann, Franz-Josef Dietzen
  • Biodegradable polyester material particles
    Patent number: 6458858
    Abstract: In a process for preparing expanded or expandable polymer beads based on biodegradable saturated polyesters made from at least one diol and from at least one dicarboxylic acid, A. polymer pellets are dispersed in a liquid, B. a volatile blowing agent is injected into the dispersion and made to impregnate the pellets at an elevated temperature, C. the pressure on the dispersion is reduced at an elevated temperature, whereupon the pellets comprising blowing agent expand to give foam, and, respectively, D. the pellets are isolated from the liquid.
    Type: Grant
    Filed: November 13, 2001
    Date of Patent: October 1, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Frank Braun, Guiscard Glück, Klaus Hahn, Uwe Witt, Isidoor de Grave
  • Expandable olefin bead polymers
    Patent number: 6448300
    Abstract: The invention relates to expandable olefin bead polymers which comprise a blowing agent with a boiling point of from −5 to 150° C., selected from the group consisting of alkanes, alkanols, ketones, ethers and esters. The particles are unfoamed and have a bulk density above 500 g/l, and can be foamed to a bulk density below 200 g/l after storage for one hour at room temperature in free contact with the atmosphere. They are prepared by impregnating polyolefin pellets in suspension in a pressure vessel with the blowing agent, cooling the batch below 100° C., reducing the pressure and isolating the particles.
    Type: Grant
    Filed: September 26, 2000
    Date of Patent: September 10, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Christian Maletzko, Klaus Hahn, Isidor de Grave, Gerd Ehrmann, Franz-Josef Dietzen
  • Method for producing expandable polystyrene particles
    Patent number: 6444714
    Abstract: A process for preparing expandable particulate styrene polymers wherein from 5 to 50% by weight of expanded graphite and also, if desired, from 2 to 20% by weight of a phosphorus compound, are present as flame retardants, by suspension polymerization of styrene in the presence of the flame retardants.
    Type: Grant
    Filed: June 11, 2001
    Date of Patent: September 3, 2002
    Assignee: BASF Aktiengesellshaft
    Inventors: Guiscard Glück, Franz-Josef Dietzen, Klaus Hahn, Gerd Ehrmann
  • Production of water-expandable styrene polymers
    Publication number: 20020115784
    Abstract: The invention relates to a process for the preparation of styrene polymers containing water as the sole expanding agent by polymerization of styrene in aqueous suspension in the presence of an amphiphilic organic emulsifier which carries both hydrophilic and hydrophobic groups, or a polar group-containing, water-miscible polymer.
    Type: Application
    Filed: December 28, 2001
    Publication date: August 22, 2002
    Applicant: BASF Aktiengesellschaft
    Inventors: Achim Datko, Peter Dodel, Klaus Hahn
  • Production of water-expandable styrene polymers
    Publication number: 20020111451
    Abstract: The invention relates to a process for the production of styrene polymers containing water as expanding agent by suspension polymerization of styrene in the presence of an emulsifying auxiliary, the suspending agent being a mixture of water and an organic liquid which is water-miscible and which is virtually a non-solvent for polystyrene and has a boiling point below 100° C.
    Type: Application
    Filed: January 11, 2002
    Publication date: August 15, 2002
    Applicant: BASF Aktiengesellschaft
    Inventors: Dietrich Lausberg, Klaus Hahn
  • Flame-proofed polystyrene foamed materials
    Patent number: 6420442
    Abstract: Flame-retardant foam slabs are based on styrene polymers wherein from 1 to 12% by weight of expanded graphite and also, if desired, from 1 to 12% by weight of a phosphorus compound are present as flame retardants.
    Type: Grant
    Filed: June 11, 2001
    Date of Patent: July 16, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Franz-Josef Dietzen, Guiscard Glück, Gerd Ehrmann, Gerhard Turznik, Gerhard Alicke, Klaus Hahn, Martin Klatt, Karlheinz Braun
  • Preparation of expandable propylene polymer beads
    Publication number: 20020074680
    Abstract: A process prepares expandable propylene polymer beads by mixing propylene polymer melt with a volatile organic blowing agent and with a nucleating agent in an extruder, whereupon the extrusion and pelletization of the extrudate takes place in a water bath under conditions of temperature and pressure at which practically no foaming of the pellets takes place.
    Type: Application
    Filed: November 5, 2001
    Publication date: June 20, 2002
    Applicant: BASF Aktiengesellschaft
    Inventors: Christian Maletzko, Klaus Hahn, Isidor De Grave, Gerd Ehrmann, Franz-Josef Dietzen
  • Method for producing water expandable styrene polymers
    Patent number: 6387968
    Abstract: The invention relates to a process for preparing styrene polymers which comprise water as sole blowing agent, by polymerizing styrene in aqueous suspension in the presence of from 0.1 to 15% by weight of a solid substance insoluble in water and in styrene, for example carbon black or graphite.
    Type: Grant
    Filed: September 14, 2000
    Date of Patent: May 14, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Guiscard Glück, Klaus Hahn, Roland Gellert
  • Method for producing expandable styrene polymers
    Patent number: 6362242
    Abstract: Expandable styrene polymers containing graphite particles are prepared by polymerizing styrene in aqueous suspension in the presence of graphite particles and of two peroxides which decompose at different temperatures, by a process in which the peroxide decomposing at the lower temperature forms neither benzoyl nor benzyl radicals on decomposition.
    Type: Grant
    Filed: March 28, 2000
    Date of Patent: March 26, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Guiscard Glück, Klaus Hahn
  • Method for producing water expandable styrene polymers
    Patent number: 6342540
    Abstract: A process prepares styrene polymers comprising water as sole blowing agent by mixing a polystyrene melt with water and with an emulsifying agent in an extruder, extruding the melt into a waterbath and pelletizing the cooled extrudate.
    Type: Grant
    Filed: September 15, 2000
    Date of Patent: January 29, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Guiscard Glück, Klaus Hahn, Peter Dodel
  • Expandable styrene polymers containing graphite particles
    Patent number: 6340713
    Abstract: Particulate expandable styrene polymers contain homogeneously distributed graphite particles and can be processed to give self-extinguishing foams having a density of ≦35 g/l.
    Type: Grant
    Filed: November 15, 1999
    Date of Patent: January 22, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Guiscard Glück, Klaus Hahn, Knut Kaempfer, Dieter Naegele, Frank Braun