Patents by Inventor Gerd Ehrmann

Gerd Ehrmann 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).

  • 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
  • Flexible open-celled microcellular polymer foams
    Publication number: 20020082311
    Abstract: Flexible open-celled microcellular foams based on thermoplastic polymers are useful for fluid-absorbent hygiene articles.
    Type: Application
    Filed: October 29, 2001
    Publication date: June 27, 2002
    Applicant: BASF Aktiengesellschaft
    Inventors: Franz-Josef Dietzen, Hans-Joachim Hahnle, Serguei Evsioukov, Gunnar Schornick, Gerd Ehrmann, Rudiger Funk
  • 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
  • Expandable olefin bead polymers
    Publication number: 20010016610
    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: Application
    Filed: January 2, 2001
    Publication date: August 23, 2001
    Applicant: BASF Aktiengesellschaft
    Inventors: Christian Maletzko, Klaus Hahn, Isidor de Grave, Gerd Ehrmann, Franz-Josef Dietzen
  • Prefoamed polyolefin beads produced by extrusion
    Patent number: 5744505
    Abstract: Prefoamed polyolefin beads, produced by extrusion followed by granulation, have a crystal structure with a double peak.
    Type: Grant
    Filed: April 10, 1997
    Date of Patent: April 28, 1998
    Assignee: BASF Aktiengesellschaft
    Inventors: Joachim Fischer, Franz-Josef Dietzen, Gerd Ehrmann, Isidoor De Grave, Jens Rieger
  • Preparation of expandable granules, and the production of foams therefrom
    Patent number: 5091126
    Abstract: A process for the preparation of expandable granules based on polyaryl ether sulfones and/or polyether imides, containing from 5 to 20% by weight of a physical blowing agent, the blowing agent and the polymers being mixed in an extruder and subsequently extruded directly into a medium at less than 40.degree. C., and a process for the production of foams from expandable granules based on polyaryl ether sulfones and/or polyether imides, containing from 5 to 20% by weight of a physical blowing agent, the granules being press molded at from 120.degree. to 250.degree. C. and at a pressure of from 5 to 30 bar to form a sheet, and the sheet being subsequently foamed by reducing the pressure, are described.
    Type: Grant
    Filed: August 3, 1990
    Date of Patent: February 25, 1992
    Assignee: BASF Aktiengesellschaft
    Inventors: Heinz Weber, Gerd Ehrmann, Franz-Josef Dietzen, Eckhard Nintz, Hans D. Zettler
  • Fiber reinforced thermoplastic integral skin foams and manufacture thereof
    Patent number: 4940629
    Abstract: Fiber reinforced thermoplastic integral skin foams of density 50-500 kg/m.sup.3 have an outer skin 0.05 to 1.5 mm in thickness and contain from 2 to 60% by weight of reinforcing fibers.
    Type: Grant
    Filed: April 24, 1989
    Date of Patent: July 10, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Heinz Weber, Gerhard Bleckmann, Gerhard Dembek, Gerd Ehrmann, Gerhard Heinz, Lothar Schlemmer